Updated on 2024/03/20

写真a

 
OSADA, Kazuo
 
Organization
Graduate School of Environmental Studies Department of Earth and Environmental Sciences Global Geochemistry Professor
Graduate School
Graduate School of Environmental Studies
Undergraduate School
School of Science Department of Earth and Planetary Science
Title
Professor
Contact information
メールアドレス
External link

Degree 2

  1. Doctor of Science ( 1996.12   Nagoya University ) 

  2. 理学修士 ( 1989.3   名古屋大学 ) 

Research Interests 7

  1. Atmospheric aerosol particles

  2. Atmospheric environment

  3. PM2.5

  4. Ammonia

  5. Deposition processes from the atmosphere

  6. Asian dust

  7. 大気成分の測定法開発

Research Areas 3

  1. Environmental Science/Agriculture Science / Environmental dynamic analysis  / atmospheric aerosols, ammonia, deposition process

  2. Environmental Science/Agriculture Science / Environmental impact assessment  / emission analysis

  3. Natural Science / Atmospheric and hydrospheric sciences  / atmospheric chemistry, geochemical cycle

Current Research Project and SDGs 6

  1. 黄砂に関する研究

  2. 南極や山岳、遠隔海洋大気のガス・エアロゾルに関する研究

  3. ガス・エアロゾルの越境汚染と地域・地球環境に関する研究

  4. atmospheric aerosol particles

  5. PM2.5濃度の変動要因の解明

  6. 大気中のアンモニアや硝酸などとエアロゾルとの相互作用に関する研究

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Research History 3

  1. Nagoya University   Graduate School of Environmental Studies Department of Earth and Environmental Sciences Global Geochemistry   Professor

    2017.1

  2. Nagoya University   Associate professor

    2001.3 - 2016.12

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    Country:Japan

  3. Nagoya University   Assistant

    1993.4 - 2001.3

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    Country:Japan

Education 3

  1. Nagoya University   Graduate School, Division of Natural Science

    1989.4 - 1993.3

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    Country: Japan

  2. Nagoya University   Graduate School, Division of Natural Science

    1985.4 - 1989.3

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    Country: Japan

  3. Hirosaki University   Faculty of Science

    1981.4 - 1985.3

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    Country: Japan

Professional Memberships 4

  1. Japan Association of Aerosol Science and Technology

    1996.9

  2. 大気環境学会   理事

    1996.9

  3. 大気化学会

    2000

  4. 日本気象学会

    1996

Committee Memberships 4

  1. 南極地域観測事業統合推進本部   観測・設営計画委員会委員  

    2023.5 - 2025.4   

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    Committee type:Government

  2. 環境省事業「令和4年度黄砂・大気汚染に関する国際協力推進調査業務」   黄砂問題検討会委員  

    2021.7   

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    Committee type:Government

  3. 鳥取大学乾燥地研究センター   鳥取大学乾燥地研究センター共同利用委員会  

    2020.4   

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    Committee type:Other

  4. 愛知県   環境審議会  

    2018.11   

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    Committee type:Municipal

Awards 4

  1. 日本エアロゾル学会論文賞

    2020.8   日本エアロゾル学会   光散乱式粒子計数器を用いたPM2.5吸湿特性の連続計測 -2016年12月の高濃度事例を交えて-

    岩本 洋子, 関根 広貴, 齊藤 伸治, 三浦 和彦, 西川 雅高, 永野 勝裕, 長田 和雄

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    Award type:Honored in official journal of a scientific society, scientific journal 

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  2. 大気環境学会 論文賞(ノート・速報部門)

    2018.9   大気環境学会   PM2.5越境問題は終焉に向かっているのか

    鵜野 伊津志, 王 哲, 弓本 桂也, 板橋 秀一, 長田 和雄, 入江 仁士, 山本 重一, 早崎 将光, 菅田 誠治

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    Award type:Honored in official journal of a scientific society, scientific journal 

  3. 日本エアロゾル学会論文賞

    2018.8   日本エアロゾル学会   九州大学筑紫キャンパスにおけるアンモニア態窒素と無機硝酸態窒素のガス・粒径別エアロゾル濃度の季節変化

    長田 和雄, 上口 友輔, 桑原 昇平, Pan Xiaole, 原 由香里, 鵜野 伊津志, 山本 重一

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    Award type:Honored in official journal of a scientific society, scientific journal 

  4. 大気環境学会 論文賞

    2017.9   大気環境学会   九州北部で2014年5月下旬から1週間継続した黄砂と高濃度大気汚染現象のオーバービュー

    鵜野 伊津志, Xiaole Pan, 板橋 秀一, 弓本 桂也, 原 由香里, 栗林 正俊, 山本 重一, 下原 孝章, 田村 圭, 緒方 美治, 長田 和雄, 上口 友輔, 山田 早紀, 小林 拓

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    Award type:Honored in official journal of a scientific society, scientific journal 

 

Papers 138

  1. NH3 emissions from the human body in central Tokyo decreased during the COVID-19 pandemic lockdown Reviewed

    Kazuo Osada, Shinji Saito, Hiroshi Tsurumaru, Syuichi Itahashi

    Atmospheric Environment   Vol. 318   2024.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.atmosenv.2023.120244

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  2. Comparison of Aerosol Acidity Based on a Direct Measurement Method and a Chemical Thermodynamic Model Reviewed International coauthorship

    Qinping Song, Kazuo Osada

    Aerosol and Air Quality Research   Vol. 23 ( 11 ) page: 230096 - 230096   2023.9

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Taiwan Association for Aerosol Research  

    DOI: 10.4209/aaqr.230096

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  3. Long-term monitoring of condensation nuclei concentrations at Syowa Station, Antarctic Reviewed

    Keiichiro HARA, Kazuo OSADA, Masanori YABUKI, Masahiko HAYASHI, Masataka SHIOBARA, Naohiko HIRASAWA, Takashi YAMANOUCHI

    Polar Data Journal   Vol. 7   page: 13 - 23   2023.4

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    DOI: 10.20575/00000045

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  4. Development of a Battery-powered Automatic Switching Device for VOC Passive Samplers Reviewed

    Osada Kazuo, Koyama Shinichi, Ohtsuka Katsuhiro, Hoshi Junya, Nudejima Chieko

    Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi   Vol. 58 ( 3 ) page: 67 - 73   2023.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society for Atmospheric Environment  

    <p>Volatile organic compounds (VOCs) are important precursors of ozone and secondary aerosol particles in the atmosphere. We developed a battery-powered VOC passive automatic sampler (VPAS) switching device that can automatically expose and store passive VOCs solvent desorption (VOC-SD) samplers. The device can hold eight samplers at any one time. The exposure time is programmable from 1 to 99 h. A strong linear relationship was observed between the mass of the VOCs collected in the VOC-SD samplers and the product of the exposure time and atmospheric concentration (as measured by the analysis of the canister samples). The uptake rates obtained from the relationship were similar to those reported in previous studies. The VPAS will be useful in air-quality research, particularly for determining VOC sources, and will enable the measurement of VOC concentrations in remote areas where commercial alternating-current power is not available.</p>

    DOI: 10.11298/taiki.58.67

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  5. Variations in gaseous nitric acid concentrations at Tottori, Japan: Long-range transport from the Asian continent and local production Reviewed

    Ryota Nojiri, Kazuo Osada, Yasunori Kurosaki, Masaya Matsuoka, Yasuhiro Sadanaga

    Atmospheric Environment   Vol. 274   2022.4

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    To evaluate factors affecting variation in gaseous nitric acid (HNO3) concentrations, including long-range transport from the Asian continent, we conducted continuous observations of HNO3 and related species from April 2016 to October 2017 in a coastal region near Tottori, Japan. HNO3 concentrations and concentration ratios of HNO3 to total odd nitrogen species (HNO3/NOy) during sea-breeze periods exhibited similar seasonal variations, with maximum concentrations during spring–summer and minimum concentrations during autumn–winter. The sea-breeze period concentrations were higher than those during land-breeze periods in spring–summer. Similar diurnal variations for HNO3 concentrations and HNO3/NOy with maximum values occurring during the daytime and minimum values during the nighttime were observed regardless of the season. These seasonal and diurnal variations were attributed to the reaction of NO2 with OH radicals and/or the thermal decomposition of ammonium nitrate (NH4NO3) aerosols. In terms of long-range transport from the Asian continent, a thermal equilibrium of HNO3 and gaseous ammonia (NH3) with NH4NO3 can affect variation of the HNO3 concentration. A chemical thermodynamics evaluation was conducted of the equilibrium of HNO3 and gaseous ammonia with NH4NO3. The concentration of extra ammonium ions was determined by taking into consideration that required for full neutralization of non-sea-salt sulfate in formation of ammonium sulfate, and seasonal variation in the results was evaluated. The results suggested that a thermal equilibrium of HNO3 and NH3 with NH4NO3 transported from the Asian continent could contribute to concentration variations of HNO3 in seasons other than summer.

    DOI: 10.1016/j.atmosenv.2022.118988

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  6. Enhanced PM<sub>2.5</sub> Concentrations at Urban Areas Causing by Biomass Combustion-derived Aerosol Transported from North Areas to South Areas in the Nobi Plain Reviewed

    Ikemori Fumikazu, Yamagami Makiko, Hisatsune Kunihiro, Osada Kazuo

    Earozoru Kenkyu   Vol. 37 ( 1 ) page: 45 - 56   2022.3

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    Authorship:Last author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Association of Aerosol Science and Technology  

    <p>To evaluate the impact of PM<sub>2.5</sub> transported from north areas (suburban areas) on the air quality in south areas (urban areas), time-resolved organic tracer components were measured in December 2016 both in south areas and north areas of the Nobi Plain. During PM<sub>2.5</sub> high value events, such as December 12–13 and 26–27 2016, the concentrations of PM<sub>2.5</sub>, dicarboxylic acids and tracers of biomass burning such as levoglucosan, were high values and these temporal variations were synchronized. Moreover, the northerly wind prevailed during the observation period and the concentration of levoglucosan firstly showed a maximum value in north areas. These results demonstrated that high concentration of PM<sub>2.5</sub> air masses originating from biomass combustion were transported from the north areas of the Nobi Plain to the south area. The characteristics of high PM<sub>2.5</sub> events in the scatter plots between levoglucosan and optical black carbon were also supported that those air mass were transported. In addition, terephthalic acid produced by plastic combustion also showed similar behavior with levoglucosan. Our findings indicate that biomass combustion in suburban areas could significantly affect the PM<sub>2.5</sub> in downwind urban areas in Nobi Plain.</p>

    DOI: 10.11203/jar.37.45

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  7. Passive permeation sampling of atmospheric HNO3 Reviewed

    Kazuo Osada, Koki Yamato, Qinping Song

    Atmospheric Environment   Vol. 267   page: 118758   2021.9

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.atmosenv.2021.118758

  8. Direct measurement of aerosol acidity using pH testing paper and hygroscopic equilibrium under high relative humidity Reviewed

    Qinping Song, Kazuo Osada

    Atmospheric Environment   Vol. 261 ( 118605 ) page: 118605   2021.9

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.atmosenv.2021.118605

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  9. Characterization of aerosol number size distributions and their effect on cloud properties at Syowa Station, Antarctica Reviewed

    Keiichiro Hara, Chiharu Nishita-Hara, Kazuo Osada, Masanori Yabuki, Takashi Yamanouchi

    Atmospheric Chemistry and Physics   Vol. 21 ( 15 ) page: 12155 - 12172   2021.8

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    DOI: 10.5194/acp-21-12155-2021

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  10. Trends in PM2.5 Concentration in Nagoya, Japan, from 2003 to 2018 and Impacts of PM2.5 Countermeasures Reviewed International journal

    Makiko Yamagami, Fumikazu Ikemori, Hironori Nakashima, Kunihiro Hisatsune, Kayo Ueda, Shinji Wakamatsu, Kazuo Osada

    Atmosphere   Vol. 12 ( 5 )   2021.5

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Atmosphere  

    DOI: 10.3390/atmos12050590

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  11. Measurement report: Short-term variation in ammonia concentrations in an urban area increased by mist evaporation and emissions from a forest canopy with bird droppings Reviewed International journal

    Kazuo Osada

    Atmospheric Chemistry and Physics   Vol. 20 ( 20 ) page: 11941 - 11954   2020.10

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    DOI: 10.5194/acp-20-11941-2020

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  12. Spatio-temporal variations of atmospheric NH<inf>3</inf> over East Asia by comparison of chemical transport model results, satellite retrievals and surface observations Reviewed International coauthorship International journal

    Wang, Z., Uno, I., Osada, K., Itahashi, S., Yumimoto, K.,Chen, X., Yang, W., Wang, Z

    Atmosphere   Vol. 11 ( 9 )   2020.9

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    DOI: 10.3390/ATMOS11090900

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  13. Atmospheric sea-salt and halogen cycles in the Antarctic. Invited Reviewed International journal

    Hara K, Osada K, Yabuki M, Matoba S, Hirabayashi M, Fujita S, Nakazawa F, Yamanouchi T

    Environmental science. Processes & impacts     2020.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/d0em00092b

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  14. Estimating Mass Concentration Using a Low-cost Portable Particle Counter Based on Full-year Observations: Issues to Obtain Reliable Atmospheric PM2.5 Data Reviewed International journal

    Ueda Sayako, Osada Kazuo, Yamagami Makiko, Ikemori Fumikazu, Hisatsune Kunihiro

    ASIAN JOURNAL OF ATMOSPHERIC ENVIRONMENT   Vol. 14 ( 2 ) page: 155-169   2020.6

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    DOI: 10.5572/ajae.2020.14.2.155

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  15. PM2.5中の水溶性有機炭素濃度の測定:フィルタ分析と連続自動分析装置との比較 Reviewed

    齊藤 伸治, 星 純也, 池盛 文数, 長田 和雄

    大気環境学会誌   Vol. 55 ( 3 ) page: 150 - 158   2020.5

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  16. Elemental compositions and sizes of carbonaceous fly ash particles from atmospheric deposition collected at Cape Hedo, Okinawa, Japan: Implications for their long-range transportation and source region variation Reviewed International journal

    Jun Inoue, Kaori Moritsugu, Takamoto Okudaira, Kazuo Osada

    Atmospheric Pollution Research   Vol. 11 ( 2 ) page: 393-400   2020.2

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    DOI: 10.1016/j.apr.2019.11.011

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  17. Seasonal variation of aerosol acidity in Nagoya, Japan and factors affecting it Reviewed International journal

    Song Qinping, Osada Kazuo

    ATMOSPHERIC ENVIRONMENT-X   Vol. 5   2020.1

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    DOI: 10.1016/j.aeaoa.2020.100062

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  18. Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica Reviewed International journal

    Hara Keiichiro, Sudo Kengo, Ohnishi Takato, Osada Kazuo, Yabuki Masanori, Shiobara Masataka, Yamanouchi Takashi

    ATMOSPHERIC CHEMISTRY AND PHYSICS   Vol. 19 ( 11 ) page: 7817-7837   2019.6

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    DOI: 10.5194/acp-19-7817-2019

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  19. Vehicular exhaust contributions to high NH3 and PM2.5 concentrations during winter in Tokyo, Japan Reviewed International journal

    Osada Kazuo, Saito Shinji, Tsurumaru Hiroshi, Hoshi Junya

    ATMOSPHERIC ENVIRONMENT   Vol. 206   page: 218-224   2019.6

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.atmosenv.2019.03.008

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  20. Decreasing trend of elemental carbon concentration with changes in major sources at Mega city Nagoya, Central Japan Reviewed International journal

    M. Yamagami, F. Ikemori, H. Nakashima, K. Hisatsune, K. Osada

    Atmospheric Environment   Vol. 199   page: 155-163   2019.2

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    DOI: 10.1016/j.atmosenv.2018.11.014

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  21. Behavior of total peroxy and total organic nitrate concentrations at Suzu on the Noto Peninsula, Japan: Long-range transport and local photochemical production Reviewed

    Sadanaga, Y., A. Ishiyama, R. Takaji, A. Matsuki, S. Kato, K. Sato, K. Osada, H. Bandow

    Atmospheric Environment   Vol. 196   page: 20-26   2019.1

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    DOI: 10.1016/j.atmosenv.2018.10.003

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  22. Sources of Optical Black Carbon in Nagoya Bay Area: Analysis Under Sea Breeze Condition Reviewed

    Osada Kazuo, Yamagami Makiko, Hisatsune Kunihiro, Ikemori Fumikazu, Chatani Satoru

    Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi   Vol. 54 ( 2 ) page: 55-61   2019

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    <p>The hourly optical black carbon (OBC) concentrations in PM<sub>2.5</sub> were measured in the south (NCIES) and north (Konan) of Nagoya City in Aichi Prefecture, Japan. In the summer, the OBC concentrations were high in the daytime under the sea breeze conditions in NCIES but no strong diurnal variation for the OBC was observed in Konan. The V and Ni in the PM<sub>2.5</sub> also showed high concentrations in the daytime in the NCIES. The source analysis of elemental carbon in the PM<sub>2.5</sub> in NCIES using a chemical transport model (CMAQ) showed dominant contributions from automobile exhausts in the morning and from ship exhausts during the daytime. The simulated daytime OBC concentrations in NCIES were higher than those at Konan, which properly fit the observed data at the sites. According to the results of tracer elements and the model simulation, the high OBC concentration observed in the daytime in the NCIES was caused by contribution from heavy oil combustion around the bay area under the sea breeze conditions.</p>

    DOI: 10.11298/taiki.54.55

  23. 光散乱式粒子計数器を用いたPM2.5吸湿特性の連続計測―2016年12月の高濃度事例を交えて― Reviewed

    岩本洋子, 関根広貴, 齊藤伸治, 三浦和彦, 西川雅高, 永野勝裕, 長田 和雄

    エアロゾル研究   Vol. 33 ( 4 ) page: 238-248   2018.12

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    <p>In order to deduce water content of PM<sub>2.5</sub> in quasi-real-time, an observation system for hygroscopic characteristics of fine particles by using an optical particle counter (OPC) was developed. Measurements of volume concentrations (<i>V</i><sub>0.3-2.0</sub>) from 0.3 to 2.0 μm in diameter to approximate PM<sub>2.5</sub> in both dried and ambient (without dried) conditions were conducted at inland and coastal sites located in the south part of Kanto plain, Japan from December 2016. The relationship between relative humidity and hygroscopic change of <i>V</i><sub>0.3-2.0</sub> was analyzed by using hygroscopicity parameters (κ<sub>v</sub>). The mean values of κ<sub>v</sub> were 0.37 and 0.58 at the inland and coastal site, respectively. The mean κ<sub>v</sub> was larger than the value calculated from chemical compositions of PM<sub>2.5</sub> based on the simple mixing rule at the coastal site. This result suggests that mixing states and organic species also have important role to determine the hygroscopic behaviors of PM<sub>2.5</sub>. Since our system is easy to handle without frequent maintenance, it is suitable for simultaneous observation at multiple points for long term. These data will help to obtain representative hygroscopicity parameters of PM<sub>2.5</sub> at various regions and seasons. </p>

    DOI: 10.11203/jar.33.238

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  24. Important contributions of sea-salt aerosols to atmospheric bromine cycle in the Antarctic coasts Reviewed International coauthorship International journal

    Hara Keiichiro, Osada Kazuo, Yabuki Masanori, Takashima Hisahiro, Theys Nicolas, Yamanouchi Takashi

    SCIENTIFIC REPORTS   Vol. 8 ( 1 )   2018.9

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    DOI: 10.1038/s41598-018-32287-4

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  25. 名古屋港で観測された夏季海陸風のホドグラフの鉛直分布 Reviewed

    永尾一平,菊本雄紀,河合 慶,長田和雄,柴田 隆,甲斐憲次

    天気   Vol. 65 ( 8 ) page: 503-520   2018.8

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  26. Morphological features and mixing states of soot-containing particles in the marine boundary layer over the Indian and Southern oceans Reviewed

    Ueda Sayako, Osada Kazuo, Hara Keiichiro, Yabuki Masanori, Hashihama Fuminori, Kanda Jota

    ATMOSPHERIC CHEMISTRY AND PHYSICS   Vol. 18 ( 13 ) page: 9207-9224   2018.7

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    DOI: 10.5194/acp-18-9207-2018

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  27. Sudden increase in atmospheric NH<sub>3</sub> concentration after drying using a hydrometeor Reviewed

    Osada Kazuo, Yamagami Makiko, Ikemori Fumikazu, Hisatsune Kunihiro, Nakashima Hironori, Miwa Atsushi, Yabutani Syouki

    Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi   Vol. 53 ( 4 ) page: 130-135   2018.7

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    <p>A sudden increase up to 16 ppbv of the hourly NH<sub>3</sub> concentration was observed after drying rain and dew on 11th December 2015. Factors related to the sudden NH<sub>3</sub> increase were investigated by using meteorological data and the chemical constituents of the rainwater. For the chemical composition of the rainwater on December 11, the pH was about 5.6 with high sea salt and Ca<sup>2+</sup>concentrations, allowing the volatilization of NH<sub>4</sub><sup>+</sup> in the rainwater after drying. Another important factor was considered to be the dew formation under the high NH<sub>3</sub> concentration. Combined with these factors, the NH<sub>3</sub> concentration in the atmosphere sharply increased with the decreasing humidity after drying hydrometeor.</p>

    DOI: 10.11298/taiki.53.130

  28. Retrieval of Aerosol Components Using Multi-Wavelength Mie-Raman Lidar and Comparison with Ground Aerosol Sampling Reviewed

    Hara Yukari, Nishizawa Tomoaki, Sugimoto Nobuo, Osada Kazuo, Yumimoto Keiya, Uno Itsushi, Kudo Rei, Ishimoto Hiroshi

    REMOTE SENSING   Vol. 10 ( 6 )   2018.6

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    DOI: 10.3390/rs10060937

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  29. Seasonal Variations of Gaseous and Size-Segregated Particulate NH<sub>x</sub> and Inorganic Nitrate at Chikushi Campus, Kyusyu University Reviewed

    OSADA Kazuo, KAMIGUCHI Yusuke, KUWAHARA Shohei, PAN Xiaole, HARA Yukari, UNO Itsushi, YAMAMOTO Shigekazu

    Earozoru Kenkyu   Vol. 33 ( 1 ) page: 31-39   2018.3

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    <p> Gaseous compounds (NH<sub>3</sub> and HNO<sub>3</sub>) and size-segregated aerosol particles (NH<sub>4</sub><sup>+</sup> and NO<sub>3</sub><sup>-</sup>) were measured at Chikushi Campus, Kyusyu University from July 31, 2014 to October 19, 2015. NH<sub>3</sub> and fine NH<sub>4</sub><sup>+</sup> concentrations were semi-continuously (34 min interval) measured by using a micro flow analytical system. HNO<sub>3</sub> and size-segregated aerosol particles were collected for 1 to 3 days intervals by using an annular denuder with a multiple filter set (Nuclepore, PTFE, and Nylon). Intensive sampling (ca. 8 hours interval) was conducted twice from September 24 to October 9, 2014 and from January 7 to 17, 2015. NH<sub>3</sub> and HNO<sub>3</sub> concentrations were high in warm season, whereas NH<sub>4</sub><sup>+</sup> and NO<sub>3</sub><sup>-</sup> concentrations in fine particles were high in cold season. NH<sub>3</sub> concentrations were low after rain in the ensuing days and were higher after days without rain. HNO<sub>3</sub> concentration during fall experiment was periodically high in daytime under sunny and sea breeze wind conditions, suggesting contribution of local NO<sub>2</sub> oxidation to high HNO<sub>3</sub> during daytime. Seasonal variations of gas-particle phase relationships of NH<sub>3</sub> and HNO<sub>3</sub> were discussed in terms of temperature dependence of NH<sub>4</sub>NO<sub>3</sub> equilibrium. Concentration products between NH<sub>3</sub> and HNO<sub>3</sub> were mostly below equilibrium of NH<sub>4</sub>NO<sub>3</sub> estimated from air temperature during sample collection, suggesting that formation of NH<sub>4</sub>NO<sub>3</sub> was limited during late winter to early spring. </p>

    DOI: 10.11203/jar.33.31

  30. Modeling the Long-Range Transport of Particulate Matters for January in East Asia using NAQPMS and CMAQ

    Wang Zhe, Itahashi Syuichi, Uno Itsushi, Pan Xiaole, Osada Kazuo, Yamamoto Shigekazu, Nishizawa Tomoaki, Tamura Kei, Wang Zifa

    AEROSOL AND AIR QUALITY RESEARCH   Vol. 17 ( 12 ) page: 3065-3078   2017.12

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    DOI: 10.4209/aaqr.2016.12.0534

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  31. Importance of Long-Range Nitrate Transport Based on Long-Term Observation and Modeling of Dust and Pollutants over East Asia Reviewed International coauthorship

    Uno Itsushi, Osada Kazuo, Yumimoto Keiya, Wang Zhe, Itahashi Syuichi, Pan Xiaole, Hara Yukari, Yamamoto Shigekazu, Nishizawa Tomoaki

    AEROSOL AND AIR QUALITY RESEARCH   Vol. 17 ( 12 ) page: 3052-3064   2017.12

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    DOI: 10.4209/aaqr.2016.11.0494

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  32. Observations of Aerosols and Trace Gases around the Chikushi Campus of Kyushu University

    Wang Zhe, Uno Itsushi, Osada Kazuo, Pan Xiaole, Yamamoto Shigekazu, Kanaya Yugo

      Vol. 153   page: 113 - 129   2017.9

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    To better understand seasonal variations in the components of PM_〈2.5〉 and related trace gases, and the impacts of long-range transport from the Asian continent to Japan, we analyzed long-term, simultaneous observations of fineand coarse-mode nitrate, related aerosol components (SO_4^〈2-〉, NH_4^+, BC, OC), and trace gases (CO, NH_3, HNO_3) around the Chikushi Campus of Kyushu University, Fukuoka (33.52°N, 130.47°E), from August 2014 to October 2015. Daily and monthly mean aerosol concentrations were analyzed to assess the main seasonal variation in pollution. We found that fine aerosols (fSO_4^〈2-〉, fNO_3^-, and fNH_4^+) explained most of the seasonal change in PM_〈2.5〉. Polarization optical particle counter measurements were useful for detecting the onset of dust transport from the Asian continent, and we observed high concentrations of coarse-mode NO_3^- (cNO_3^-) during dust period, which indicated the formation of dust nitrate during transport. We also analyzed diurnal variation in the basic aerosol components for different seasons, weekday/weekend effects (for CO, BC, and NH3), and sensitivity on days with and without precipitation (for CO, BC, NH_3, PM_〈2.5〉, and PMc). Observational data for HNO_3, fNO_3^-, and cNO_3^- demonstrated that cNO_3^- accounted for the largest proportion of total nitrate (defined as the sum of fNO_3^-, cNO_3^-, and HNO_3), constituting 40–55% of the total nitrate during the winter, whereas HNO_3 gas constituted approximately 40% of the total nitrate in summer and fNO_3^- peaked during the winter.

    DOI: 10.15017/1924421

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  33. Analysis of the Seasonal Variation in Atmospheric NH_3 over East Asia International coauthorship

    Wang Zhe, Uno Itsushi, Osada Kazuo, Itahashi Syuichi, Yumimoto Keiya, Yamamoto Shigekazu

      Vol. 153   page: 130 - 141   2017.9

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    Atmospheric ammonia (NH_3) plays an important role in the formation and understanding of secondary inorganic aerosols, but has not been examined using chemical transport models (CTMs) and atmospheric levels have not been compared with satellite observations. Here, we analyzed the seasonal variation in atmospheric NH_3 using long-term hourly NH_3/NH_4^+ measurements made at the Chikushi Campus of Kyushu University in Fukuoka, nationwide filter pack (FP) network observations over Japan, GEOS-Chem CTM results, and Infrared Atmospheric Sounding Interferometer (IASI) satellite retrievals over East Asia. We found that the IASI NH_3 retrieval over central and north China had a strong correlation with the CTM results (R = 0.74). There was a similar correlation over south China, but the IASI NH_3 retrieval was only 48% of the CTM value. CTM results over Japan reproduced the major seasonal variations compared with surface observations, but IASI observations over Japan were below or near the detection limit and it was difficult to obtain a reasonable correlation with measurements.

    DOI: 10.15017/1924422

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  34. PM2.5高濃度イベント時のエアロゾル粒子中有機トレーサー成分 β線自動測定機のテープろ紙を用いた高時間分解能解析 Reviewed

    池盛 文数, 山神 真紀子, 久恒 邦裕, 長田 和雄

    大気環境学会誌   Vol. 52 ( 4 ) page: 118 - 128   2017.7

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    2015年12月9、10日に名古屋で観測されたPM2.5質量濃度の日内変動が大きい高濃度イベントに対して、PM2.5自動測定機のテープろ紙を用いて3時間ごとに15種類の有機トレーサー成分の測定を行った。植物燃焼とプラスティック燃焼による一次粒子の有機トレーサー成分(レボグルコサンなど)は、PM2.5質量濃度と同じく9日夜間および10日深夜に濃度が上昇した。一方、二次的に生成した有機トレーサー成分(リンゴ酸など)の多くは、一次粒子の有機トレーサーとは異なり、12月10日のピークは見られるものの、9日夜間には明確な濃度ピークが見られなかった。また、PM2.5質量濃度に対する各有機トレーサーの含有率は、一次粒子の有機トレーサー成分の多くがPM2.5質量濃度と類似の時間変化を示した。このため、一次粒子濃度の増加が観測期間のPM2.5高濃度化に寄与したと考えられる。これに対して、二次性成由来の有機トレーサー成分は、12月9日夜間にはその前後の期間に対し含有率が減少する傾向にあり、10日深夜は、他の期間よりコハク酸と3-ヒドロキシグルタル酸のみ含有率が高い傾向にあった。このように、PM2.5の高濃度化現象に対する有機物質の寄与は、一次粒子と二次粒子とで大きく異なっていた。高時間分解能での有機トレーサー成分の解析は、時間変動の大きい高濃度事例の要因を解析するために有用である。(著者抄録)

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  35. Nitrate transboundary heavy pollution over East Asia in winter Reviewed International journal

    Itahashi Syuichi, Uno Itsushi, Osada Kazuo, Kamiguchi Yusuke, Yamamoto Shigekazu, Tamura Kei, Wang Zhe, Kurosaki Yasunori, Kanaya Yugo

    ATMOSPHERIC CHEMISTRY AND PHYSICS   Vol. 17 ( 6 ) page: 3823-3843   2017.3

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    DOI: 10.5194/acp-17-3823-2017

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  36. 立山における粗大粒子体積濃度から見た黄砂飛来頻度の季節変化 Reviewed

    長田和雄, 清水厚, 飯田肇, 木戸瑞佳

    エアロゾル研究   Vol. 32   page: 44-51   2017.3

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  37. Trans-boundary transport of PM2.5 to the western Japan and Japan Sea side regions based on the Source-Receptor Analysis

    Kuwahara Shohei, Uno Itsushi, Wang Zhe, Itahashi Syuichi, Yumimoto Keiya, Osada Kazuo, Yamamoto Shigekazu

      Vol. 152   page: 1 - 11   2017.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Research Institute for Applied Mechanics, Kyushu University  

    Long-term synergetic fine and coarse mode aerosol observations were analyzed at 1-h intervals at the Chikushi-campus of Kyushu University, Fukuoka, Japan, from December 2013 to March 2015. The GEOS-Chem chemical transport model, including dust and sea-salt acid uptake processes, was used for detailed analysis of observation data. Long-range anthropogenic aerosol trans-boundary transport events were observed during our analysis period, and the numerical model generally captured the observed time variation of PM_〈2.5〉 aerosols. In order to have a better understanding of trans-boundary PM_〈2.5〉 contribution, the model domain was divided into 15 major source regions, and emission intensity sensitivity analysis was conducted to show the detailed source-receptor relationship. We found the Japanese domestic contribution to annual averaged PM_〈2.5〉 concentration at Fukuoka was 20 %, and another 80% were coming from outside Japan (19.6 % and 16.3% were coming from central north China region and Korea, respectively). From late fall to early spring when the PM_〈2.5〉 concentration became higher, the trans-boundary fraction reached up to 90%, and this fraction was higher when the daily PM_〈2.5〉 concentration exceeded the environmental standards of 35μm/m^3.

    DOI: 10.15017/1917875

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  38. Optical properties of mixed aerosol layers over Japan derived with multi-wavelength Mie-Raman lidar system

    Hara Yukari, Nishizawa Tomoaki, Sugimoto Nobuo, Matsui Ichiro, Pan Xiaole, Kobayashi Hiroshi, Osada Kazuo, Uno Itsushi

    JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER   Vol. 188   page: 20-27   2017.2

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    DOI: 10.1016/j.jqsrt.2016.06.038

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  39. Seasonal variation of fine- and coarse-mode nitrates and related aerosols over East Asia: Synergetic observations and chemical transport model analysis Reviewed

    Uno, I., Osada, K., Yumimoto, K., Wang, Z., Itahashi, S., Pan, X., Hara, Y., Kanaya, Y., Yamamoto, S. and Fiarlie, T.D

    Atmos. Phys. Chem   Vol. 17   page: 14181-14197   2017

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    DOI: 10.5194/acp-17-14181-2017

  40. Simultaneous Dust and Pollutant Transport over East Asia: The Tripartite Environment Ministers Meeting March 2014 Case Study

    Uno Itsushi, Yumimoto Keiya, Pan Xiaole, Wang Zhe, Osada Kazuo, Itahashi Syuichi, Yamamoto Shigekazu

    SOLA   Vol. 13   page: 47-52   2017

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    DOI: 10.2151/sola.2017-009

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  41. Dust Acid Uptake Analysis during Long-Lasting Dust and Pollution Episodes over East Asia Based on Synergetic Observation and Chemical Transport Model

    Uno Itsushi, Yumimoto Keiya, Osada Kazuo, Wang Zhe, Pan Xiaole, Itahashi Syuichi, Yamamoto Shigekazu

    SOLA   Vol. 13   page: 109-113   2017

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    DOI: 10.2151/sola.2017-020

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  42. Trans-Boundary Transport of PM<sub>2.5</sub> to the Western Japan and Japan Sea Side Regions Based on the Source-Receptor Analysis

    UNO Itsushi, KUWAHARA Shohei, WANG Zhe, ITAHASHI Syuichi, YUMIMOTO Keiya, OSADA Kazuo, YAMAMOTO Shigekazu

    Earozoru Kenkyu   Vol. 32 ( 3 ) page: 188-198   2017

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    <p> In order to have a better understanding of Asian scale trans-boundary PM<sub>2.5</sub> contribution over western Japan and Japan Sea side area, source-receptor analysis based on the chemical transport model was conducted. We used GEOS Chem model and divided the Asian model domain into 15 major source regions, and the emission intensity sensitivity (source-receptor relationship) was examined. Long-term aerosol observation data at the Chikushi-campus of Kyushu University, Fukuoka, Japan, from December 2013 to March 2015 was used to validate the model performance. We also confirmed that the numerical model generally captured the observed time variation of PM<sub>2.5</sub> at remote islands (Miyakojima, Fukue, Oki, and Sado) quite well. We showed that the contribution of Japanese domestic emission to the annual averaged PM<sub>2.5</sub> concentration at Fukuoka was only 20%, and the other 80% of PM<sub>2.5</sub> was coming from outside of Japan (19.6% and 16.3% were coming from central north China region and Korea, respectively). Modeled source-receptor ratio in Fukuoka and the observed PM<sub>2.5</sub> concentration decrease in Beijing-Tianjin-Shandong area explained the recent decreasing trend of PM<sub>2.5</sub> (13% decrease from 2014 to 2016) at Fukuoka. </p>

    DOI: 10.11203/jar.32.188

  43. PM<sub>2.5</sub>高濃度イベント時のエアロゾル粒子中有機トレーサー成分―β線自動測定機のテープろ紙を用いた高時間分解能解析―

    池盛 文数, 山神 真紀子, 久恒 邦裕, 長田 和雄

    大気環境学会誌   Vol. 52 ( 4 ) page: 118-128   2017

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    <p>2015年12月9、10日に名古屋で観測されたPM<sub>2.5</sub>質量濃度の日内変動が大きい高濃度イベントに対して、PM<sub>2.5</sub>自動測定機のテープろ紙を用いて3時間ごとに15種類の有機トレーサー成分の測定を行った。植物燃焼とプラスティック燃焼による一次粒子の有機トレーサー成分 (レボグルコサンなど) は、PM<sub>2.5</sub>質量濃度と同じく9日夜間および10日深夜に濃度が上昇した。一方、二次的に生成した有機トレーサー成分 (リンゴ酸など) の多くは、一次粒子の有機トレーサーとは異なり、12月10日のピークは見られるものの、9日夜間には明確な濃度ピークが見られなかった。また、PM<sub>2.5</sub>質量濃度に対する各有機トレーサーの含有率は、一次粒子の有機トレーサー成分の多くがPM<sub>2.5</sub>質量濃度と類似の時間変化を示した。このため、一次粒子濃度の増加が観測期間のPM<sub>2.5</sub>高濃度化に寄与したと考えられる。これに対して、二次生成由来の有機トレーサー成分は、12月9日夜間にはその前後の期間に対し含有率が減少する傾向にあり、10日深夜は、他の期間よりコハク酸と3-ヒドロキシグルタル酸のみ含有率が高い傾向にあった。このように、PM<sub>2.5</sub>の高濃度化現象に対する有機物質の寄与は、一次粒子と二次粒子とで大きく異なっていた。高時間分解能での有機トレーサー成分の解析は、時間変動の大きい高濃度事例の要因を解析するために有用である。</p>

    DOI: 10.11298/taiki.52.118

  44. Is PM<sub>2.5</sub> Trans-boundary Environmental Problem in Japan dramatically improving?

    Uno Itsushi, Wang Zhe, Yumimoto Keiya, Itahashi Syuichi, Osada Kazuo, Irie Hitoshi, Yamamoto Shigekazu, Hayasaki Masamitsu, Sugata Seiji

    Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi   Vol. 52 ( 6 ) page: 177-184   2017

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    <p>The PM<sub>2.5</sub> concentration decreases between 2013 and 2016 over Japan were analyzed by observation and a chemical transport model. During this period, the annual mean PM<sub>2.5</sub> decreased in Japan and the number of PM<sub>2.5</sub> sub-standard days underwent a dramatic reduction. Our analysis confirmed that the PM<sub>2.5</sub> in northern China, SO<sub>2</sub> and NO<sub>2</sub> vertical column density over Central East China by satellite showed about a 10%/y reduction and this happened due to the anthropogenic emission reductions (almost 10%/y reduction). A Source-receptor analysis by a chemical transport model showed that a 20% reduction of the Chinese PM<sub>2.5</sub> concentration will decrease the annual mean PM<sub>2.5</sub> in Fukuoka by 12%. Our analysis indicated that if the current emission reduction rate continues over China, the high concentration of transboundary PM<sub>2.5</sub> problem in Japan will very quickly improve.</p>

    DOI: 10.11298/taiki.52.177

  45. PM2.5越境汚染は終焉にむかっているか? Reviewed International coauthorship

    鵜野 伊津志, 板橋 秀一, 弓本 桂也, 長田 和雄, 入江 仁士

    大気環境学会誌   Vol. 52   page: 177 - 184   2017

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  46. ソース・レセプター解析による西日本・日本海沿岸へのPM2.5越境輸送 International coauthorship

    鵜野 伊津志, 板橋 秀一, 弓本 桂也, 長田 和雄

    九州大学応用力学研究所所報   Vol. 152   page: 1 - 11   2017

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  47. Polarization properties of aerosol particles over western Japan: classification, seasonal variation, and implications for air quality

    Pan Xiaole, Uno Itsushi, Hara Yukari, Osada Kazuo, Yamamoto Shigekazu, Wang Zhe, Sugimoto Nobuo, Kobayashi Hiroshi, Wang Zifa

    ATMOSPHERIC CHEMISTRY AND PHYSICS   Vol. 16 ( 15 ) page: 9863-9873   2016.8

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    DOI: 10.5194/acp-16-9863-2016

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  48. "Sizing" Heterogeneous Chemistry in the Conversion of Gaseous Dimethyl Sulfide to Atmospheric Particles

    Enami Shinichi, Sakamoto Yosuke, Hara Keiichiro, Osada Kazuo, Hoffmann Michael R., Colussi Agustin J.

    ENVIRONMENTAL SCIENCE & TECHNOLOGY   Vol. 50 ( 4 ) page: 1834-1843   2016.2

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    DOI: 10.1021/acs.est.5b05337

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  49. 九州北部で2014年5月下旬から1週間継続した黄砂と高濃度大気汚染現象のオーバービュー

    鵜野伊津志, Xiaole Pan, 板橋秀一, 弓本桂也, 原由香里, 栗林正俊, 山本重一, 下原孝章, 田村圭, 緒方美治, 長田和雄, 上口友輔, 山田早紀, 小林拓

    大気環境学会誌   Vol. 51 ( 1 ) page: 44-57   2016.1

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  50. 大気エアロゾル化学成分連続自動分析装置(ACSA-12)とデニューダー・フィルター法による大気エアロゾル粒子の粒径別イオン成分濃度の比較 Reviewed

    長田 和雄,上口 友輔,山本 重一,桑原昇平,Pan Xiaole,原 由香里,鵜野 伊津志

    エアロゾル研究   Vol. 31   page: 203-209   2016

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  51. Numerical Analysis of Trans-Boundary Transport of Dust-Nitrate during the Long-Lasting Yellow Sand Episode Observed over the Northern Kyushu Area in Late May—Early June 2014

      Vol. 51 ( 4 )   2016

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    DOI: 10.11298/taiki.51.181

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  52. 九州北部域のエアロゾルの長期連続観測とモデル解析

    鵜野伊津志, 長田和雄, 弓本桂也, 山本重一

    クリーンテクノロジー   Vol. 2016年9月号   page: 17-22   2016

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  53. Total dust deposition flux during precipitation in Toyama, Japan, in the spring of 2009: A sensitivity analysis with the NASA GEOS-5 Model Reviewed

    Yasunari, T. J., Colarco, P. R., Lau, W. K., Osada, K., Kido, M., and 3 others

    Atmospheric Research   Vol. 167   page: 298-313   2015.9

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    DOI: 10.1016/j.atmosres.2015.08.005

  54. Terminal settling velocity and physical properties of pollen grains in still air Reviewed

    Hirose, Y. and K. Osada

    Aerobiologia     2015

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    DOI: 10.1007/s10453-015-9408-0

  55. Seasonal Variations of Peroxyacyl Nitrates and Organic Nitrate Concentrations at Suzu, the Noto Peninsula

    Ishiyama Ayana, Takaji Ryo, Sadanaga Yasuhiro, Matsuki Atsushi, Sato Keiichi, Osada Kazuo, Bandow Hiroshi

    Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi   Vol. 50 ( 1 ) page: 16-26   2015

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    PANs (peroxyacyl nitrates) and ONs (organic nitrates) have been being observed using a thermal dissociation/cavity attenuated phase shift spectroscopy method since December 2012 at Suzu, the Noto Peninsula. In this article, observational results and analyses for the period from December 2012 to August 2013 are described, focusing on the seasonal variations of the PANs and ONs. Both the PANs and ONs showed seasonal variations with spring maxima and summer minima. The air mass origins arriving at Suzu were classified into the following five groups: Russia, North-East China, Middle China·Korea, Japan and Sea, using backward trajectory analyses. From winter to spring, both the PANs and ONs concentrations from Middle China·Korea were higher than those from the other air mass origins. From the spring to summer, their concentrations were independent of the air mass origins. No definite diurnal variations were observed from winter to spring. Meanwhile, the diurnal variations of the PANs and ONs concentrations had daytime maximum and nighttime minimum values from the spring to summer. We concluded that the PANs and ONs concentrations from winter to spring and those from spring to summer would be governed by the long-range transport and in-situ photochemical generation, respectively.

    DOI: 10.11298/taiki.50.16

  56. Wet and dry deposition of mineral dust particles in Japan: factors related to temporal variation and spatial distribution Reviewed

    K. Osada, S. Ura, M. Kagawa, M. Mikami, T. Y. Tanaka, S. Matoba, K. Aoki, M. Shinoda, Y. Kurosaki, M. Hayashi, A. Shimizu, and M. Uematsu

    Atmospheric Chemistry and Physics   Vol. 14   page: 1107-1121   2014.1

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  57. Water soluble fraction of Asian dust particles Reviewed

    K. Osada

    Atmospheric Research   Vol. 124   page: 101–108   2013.1

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    DOI: 10.1016/j.atmosres.2013.01.001

  58. Tethered balloon-borne aerosol measurements: seasonal and vertical variations of aerosol constituents over Syowa Station, Antarctica

    Hara K., Osada K., Yamanouchi T.

    ATMOSPHERIC CHEMISTRY AND PHYSICS   Vol. 13 ( 17 ) page: 9119-9139   2013

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    DOI: 10.5194/acp-13-9119-2013

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  59. Air‐sea gas transfer rate for the Southern Ocean inferred from 222Rn concentrations in maritime air and a global atmospheric transport model Reviewed

      Vol. 118   page: 7606–7616   2013

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    DOI: doi:10.1002/jgrd.50594

  60. Seasonal variation of fractionated sea-salt particles on the Antarctic coast

    Hara K., Osada K., Yabuki M., Yamanouchi T.

    GEOPHYSICAL RESEARCH LETTERS   Vol. 39 ( 17 )   2012.9

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    DOI: 10.1029/2012GL052761

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  61. Modeling studies of outflow of continental polluted air mass observed in Cape Hedo, Okinawa, during the W-PASS 2008 spring observation campaign

    UNO Itsushi, ITAHASHI Syuichi, YAMAJI Kazuyo, TAKAMI Akinori, OSADA Kazuo, YOKOUCHI Yoko, SHIMIZU Atsushi, KANEYASU Naoki, KAJII Yoshizumi, KATO Shungo, FURUTANI Hiroshi, UEMATSU Mitsuo

      Vol. 47 ( 5 ) page: 195-204   2012.9

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  62. Interannual variation in the fine-mode MODIS aerosol optical depth and its relationship to the changes in sulfur dioxide emissions in China between 2000 and 2010

    Itahashi S., Uno I., Yumimoto K., Irie H., Osada K., Ogata K., Fukushima H., Wang Z., Ohara T.

    ATMOSPHERIC CHEMISTRY AND PHYSICS   Vol. 12 ( 5 ) page: 2631-2640   2012

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    DOI: 10.5194/acp-12-2631-2012

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  63. Modeling studies of outflow of continental polluted air mass observed in Cape Hedo, Okinawa,during the W-PASS 2008 spring observation campaign

    Uno, Itsushi, Itahashi, Syuichi, Yamaji, Kazuyo, Takami, Akinori, Osada, Kazuo, Yokouchi, Yoko, Shimizu, Atsushi, Kaneyasu, Naoki, Kajii, Yoshizumi, Kato, Shungo, Furutani, Hiroshi, Uematsu, Mitsuo

    Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi   Vol. 47 ( 5 )   2012

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    DOI: 10.11298/taiki.47.195

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  64. 非水溶性大気沈着物中のFe含有量を用いた鉱物質ダスト量の推定 Reviewed

    浦 幸帆, 長田 和雄, 香川 雅子, 三上 正男, 的場 澄人, 青木 一真, 篠田 雅人, 黒崎 泰典, 林 政彦, 清水 厚, 植松 光夫

    エアロゾル研究   Vol. 26   page: 234-241   2011.9

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  65. テストダスト粒子に含まれる水溶性物質の体積割合 Reviewed

    長田和雄・川北康介・上田紗也子・水野祐貴

    エアロゾル研究   Vol. 26 ( 2 ) page: 147-151   2011.6

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  66. Measurements of Gaseous NH3 and Particulate NH4+ in the Atmosphere by Fluorescent Detection after Continuous Air-water Droplet Sampling

    Osada K., Ueda S., Egashira T., Takami A., Kaneyasu N.

    AEROSOL AND AIR QUALITY RESEARCH   Vol. 11 ( 2 ) page: 170-178   2011.4

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    DOI: 10.4209/aaqr.2010.11.0101

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  67. Temporal and spatial variations of wet deposition flux of mineral dust in Japan Reviewed

    K. Osada, S. Ura, M. Kagawa, M. Mikami, T. Y. Tanaka, S. Matoba, K. Aoki, M. Shinoda, Y. Kurosaki, M. Hayashi, A. Shimizu, and M. Uematsu

    SOLA   Vol. 7   page: 49-52   2011.3

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  68. Measurements of gaseous NH3 and particulate NH4+ in the atmosphere by fluorescent detection after continuous air-water droplet sampling Reviewed

    Osada, K., S. Ueda, T. Egashira, A. Takami, and N. Kaneyasu

    AAQR   Vol. 11   page: 170-178   2011.3

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  69. Mixing states of cloud interstitial particles between water-soluble and insoluble materials at Mt. Tateyama, Japan: Effects of meteorological conditions

    Ueda, S., Osada, K., Okada, K.

    Atmospheric Research   Vol. 99 ( 2 ) page: 325-336   2011.2

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    DOI: 10.1016/j.atmosres.2010.10.021

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  70. Atmospheric Radon Observation on the Antarctic Ocean

    TASAKA Shigeki, MATSUBARA Masaya, TAGUCHI Shoichi, OSADA Kazuo, YAMANOUCHI Takashi

      Vol. 58 ( 1 ) page: 31-38   2011.1

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  71. Morphological features of soot-containing particles internally mixed with water-soluble materials in continental outflow observed at Cape Hedo Reviewed

    Ueda, S., K. Osada, and A. Takami

    J. Geophys. Res.     2011

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    DOI: 10.1029/2010JD015565

  72. Variation and Distribution of Ammonia/Ammonium Concentration at the Cape Hedo, Okinawa in the Ambient Air

    TAKAMI Akinori, OSADA Kazuo, SADANAGA Yasuhiro, BANDOW Hiroshi

    Earozoru Kenkyu   Vol. 26 ( 1 ) page: 42-46   2011

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    Ammonia (NH<sub>3</sub>) in ambient air was measured at Cape Hedo, Okinawa, in spring 2008 using a photo-acoustic spectroscopy method (TGA310, Omnisens). Average concentration and standard deviation (1σ) of NH<sub>3</sub> was 0.56±0.50 ppbv. It is considered that the variation in NH<sub>3</sub> concentration does not come from the long range transport. The concentration and standard deviation (1σ) of ammonium ion (NH<sub>4</sub><sup>+</sup>) measured using an aerosol mass spectrometer (Q-AMS, Aerodyne) was 2.2±1.4 µgm<sup>-3</sup> and NH<sub>4</sub><sup>+</sup> was more than 80% for NH<sub>3</sub>+NH<sub>4</sub><sup>+</sup> when NH<sub>4</sub><sup>+</sup> was transported over long-range associated with sulfate (SO<sub>4</sub><sup>2-</sup>). NH<sub>4</sub><sup>+</sup> was deficient when SO<sub>4</sub><sup>2-</sup>/(SO<sub>2</sub>+SO<sub>4</sub><sup>2-</sup>) was large in air masses.<br>

    DOI: 10.11203/jar.26.42

  73. Seasonal features of ultrafine particle volatility in the coastal Antarctic troposphere

    Hara K., Osada K., Nishita-Hara C., Yabuki M., Hayashi M., Yamanouchi T., Wada M., Shiobara M.

    ATMOSPHERIC CHEMISTRY AND PHYSICS   Vol. 11 ( 18 ) page: 9803-9812   2011

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    DOI: 10.5194/acp-11-9803-2011

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  74. Seasonal variations and vertical features of aerosol particles in the Antarctic troposphere

    Hara K., Osada K., Nishita-Hara C., Yamanouchi T.

    ATMOSPHERIC CHEMISTRY AND PHYSICS   Vol. 11 ( 11 ) page: 5471-5484   2011

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    DOI: 10.5194/acp-11-5471-2011

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  75. Water Soluble Volume Fraction of Test Dust Particles

    OSADA Kazuo, KAWAKITA Kousuke, UEDA Sayako, MIZUNO Yuki

    Earozoru Kenkyu   Vol. 26 ( 2 ) page: 147-151   2011

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    Volume fraction (<i>ε</i>) of water-soluble material in atmospheric aerosol particles is an important parameter related to hygroscopicity and activation processes to cloud particles. In order to estimate ε of individual coarse dust particles, a confocal scanning laser microscope was applied to direct measurement of volume difference of individual particles before and after water-dialysis using Nuclepore filters (nominal pore size: 0.05 µm) as a collection substrate of an aerosol impaction sampler. Individual particles of Arizona Test Dust (ATD) and reference Asian dusts (CJ-1 and CJ-2) were analyzed for , and their results were combined into 3 size ranges (2-3.4, 3.5-8.4, and 8.5-30 µm) and 2 size ranges (2-3.4 and 3.5-10 µm), respectively. These test dust particles showed various ε ranging from 18% (ATD) to 41% (CJ-1) on the average. More than 50% of the analyzed test dusts particles contained soluble fraction (<i>ε</i>>10%), except the ATD particles of size range 2-3.4 µm which are dominated by particles with insoluble components.<br>

    DOI: 10.11203/jar.26.147

  76. Estimation of Mineral Dust Amount Using Fe Content in Water-Insoluble Residue of Atmospheric Deposition Samples

    URA Sachiho, SHIMIZU Atsushi, UEMATSU Mitsuo, OSADA Kazuo, KAGAWA Masako, MIKAMI Masao, MATOBA Sumito, AOKI Kazuma, SHINODA Masato, KUROSAKI Yasunori, HAYASHI Masahiko

    Earozoru Kenkyu   Vol. 26 ( 3 ) page: 234-241   2011

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    Water-insoluble filtered residue materials of atmospheric wet and dry deposition are composed of mineral dusts and organic materials such as pollens. The number of pollens in the filter residue of deposition samples at Tottori was counted for 2 sizes at about 45 and 30 µm using a confocal laser microscope. Non-destructive X-ray fluorescence (XRF) analysis was used to measure Fe content of the filter residue. Relationship between Fe content analyzed by XRF and insoluble residue weight corrected for pollen weight assuming pollen density of 0.9 g/cm<sup>3</sup> showed a linear relationship, suggesting that insoluble residue corrected for pollen weight contains Fe of 3.7 % by weight on the average. The average Fe content is consistent with the values reported for Asian dust (Kosa) events in Korea and China. Because Fe content of insoluble residue in filter samples is easily measured by XRF method, mineral dust amounts in the filter residue samples can be estimated from Fe content of the sample and the average fraction of Fe for Asian dust.<br>

    DOI: 10.11203/jar.26.234

  77. 昭和基地で観測されたヘイズ現象

    原圭一郎, 長田和雄, 矢吹正教, 橋田元, 山内恭, 林政彦, 塩原匡貴, 西田千春, 和田誠

    南極資料     page: Vol.54   2011

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  78. 海洋観測専用船による南極海の大気エアロゾル観測

    長田和雄, 原圭一郎, 矢吹正教, 西田千春, 小林拓, 三浦和彦, 上田紗也子, 林政彦, 橋田元, 塩原匡貴, 和田誠, 山内恭

    南極資料     page: Vol.54   2011

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  79. Maritime aerosol optical thickness measured during Antarctic research cruises of R V Umitaka-Maru

    Hiroshi Kobayashi, Toru Hirawake, Masanori Yabuki, Sayako Ueda, Kazuo Osada, Masataka Shiobara, Mitsuo Fukuchi

      Vol. 54 ( 0 ) page: 465-473   2010.12

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    東京海洋大学[海鷹丸]の南極海研究航海において,大気エアロゾルの光学的厚さ(AOT)の観測を実施した.南極海インド洋セクターでの500 nmでのAOTは,0.02-0.12の範囲であった.南極大陸沿岸域でのAOTは比較的低く,0.02前後であった.40-60゜Sの海域では,0.1以上の値を示すことがあった.インド洋低中緯度帯でのAOTは,0.05-0.15の範囲であった.風速とAOTとに正の相関がみられたことから,南極海では光学的に海塩粒子が卓越し,風速がAOTに影響を及ぼしていると考えられる.AOTが高くなるにつれ,オングストローム指数は減少した.AOTの波長スペクトルにおいて,380 nmと870 nmのAOTはべき関数からずれる傾向がみられた.レイリーの光学的厚さの算出方法を比較したところ,ずれが大幅に改善される可能性が示された.今後,より観測精度を高めていくためには,機器定数の精度を把握するとともに,レイリーの光学的厚さの算出方法の見直しなどが必要である.Aerosol optical thickness (AOT) was measured during Antarctic research cruises of R V Umitaka-Maru. The measured AOTs at 500 nm in the Indian sector of the Antarctic Ocean ranged from 0.02 to 0.12. In Antarctic coastal waters, the AOTs were as low as around 0.05. On the other hand, the some AOTs were higher than 0.1 from 40゜S to 60゜S. In middle and low latitude regions of the Indian Ocean, the AOTs ranged from 0.05 to 0.15. The AOTs were correlated with wind speed. It is indicated that sea-salt particles, generated by wind, dominated optically and wind speed affected the AOT in the Antarctic Ocean. Angstro¨m exponent decreased with increasing AOT. In the AOT wavelength spectra, some AOTs in 380 nm and 870 nm tended to deviate from the power function. Comparing calculation methods of Rayleigh optical thickness suggested a possibility of reducing the deviations of these AOTs. In the future, accuracy check of the instrument constant and review of the calculation method of Rayleigh optical thickness are recommended to enhance the accuracy of maritime AOT measurement.

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  80. Monitoring of aerosol concentration at Syowa Station

    Hayashi Masahiko, Osada Kazuo, Hara Keiichiro, Yabuki Masanori, Kobayashi Hiroshi, Ihara Satoshi, Wada Makoto, Yamanouchi Takashi, Hashida Gen, Shiobara Masataka

    Antarctic record   Vol. 54 ( 0 ) page: 474-486   2010.12

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    Concentrations of condensation nuclei (&gt;0.01 μm in diameter) and of aerosol particles larger than 0.3 μm in diameter were monitored at Syowa Station from February, 1996. Number concentrations of condensation nucleus were high in summer and low in winter. Concentrations increased at the rate of several partcles cm^3 per year. On the other hand, the concentrations of fine particles (&gt;0.3 μm) and coarse particles (&gt;1.0 μm) were low in summer and high in winter. Concentrations of fine particles 0.3 μm and larger after July were double those before July.

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  81. 沖縄辺戸岬における大気中のアンモニア/アンモニウム濃度の変動と分配 Reviewed

    高見 昭憲、長田和雄、定永靖宗、坂東博、

    エアロゾル研究   Vol. 掲載決定   2010.12

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    沖縄・辺戸岬でのアンモニア観測の結果をまとめた論文である。

  82. Seasonal variation of size distribution of submicrometer aerosol particles at Syowa Station, Antarctica

    Osada Kazuo, Nishita-Hara Chiharu, Hara Keiichiro, Yabuki Masanori, Shiobara Masataka, Wada Makoto, Yamanouchi Takashi, Hayashi Masahiko

    Antarctic record   Vol. 54 ( 0 ) page: 530-540   2010.12

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    Number-size distributions (5-168 nm in diameter) of atmospheric aerosol particles were measured at Syowa Station, Antarctica from February 2004 to January 2005. Size distributions in winter consisted of 1 to 2 modes larger than 50 nm in diameter, whereas 2 to 3 modes contributed to the size distributions in October to March with mode diameters between 20 and 80 nm. Size distribution with a valley at around 50 nm was often observed in summer to fall when the open ocean was located near Syowa Station. From September to March, concentration of ultra fine particles (<20 nm) was occasionally high. Associated with local wind pattern after vertical mixing of boundary layer air in late afternoon, high concentrations of ultra fine particles were observed for several days in late November.

  83. Seasonal variation of carbonaceous and metal compositions of atmospheric aerosols at Syowa Station, Antarctica in 2001

    Kobayashi Hiroshi, Hara Keiichiro, Shiobara Masataka, Yamanouchi Takashi, Osada Kazuo, Ohta Sachio

    Antarctic record   Vol. 54 ( 0 ) page: 554-561   2010.12

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    Antarctic aerosols collected at Syowa Station in 2001 were analyzed to investigate their seasonal variations and long-range transport of anthropogenic aerosols. The measured chemical species were elemental carbon and organic carbon, and metals such as Al, V, Cr, Mn, Fe, Co, Ni, Zn and Pb. Concentration of elemental carbon was relatively low in April-June and was high in March, October and November. The concentrations of Al, V, Co, Ni and Pb were sometimes lower than the detection limits. Spikes of the highest concentrations of V, Cr, Fe, Co, Ni, Zn and Pb were recorded in August-October. The enrichment factors were high during blizzards. This indicates that air masses containing anthropogenic aerosols were transported to Antarctica by low-pressure system perturbation.

  84. Haze episodes at Syowa Station, Antarctica

    Hara Keiichiro, Osada Kazuo, Yabuki Masanori, Hashida Gen, Yamanouchi Takashi, Hayashi Masahiko, Shiobara Masataka, Nishita-Hara Chiharu, Wada Makoto

    Antarctic record   Vol. 54 ( 0 ) page: 593-622   2010.12

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    During our aerosol measurement program at Syowa Station, Antarctica in 2004-2007, some low visibility (haze) phenomena were observed under conditions with weak wind and without drifting snow and fog in winter-spring. In the "Antarctic haze" phenomenon, the number concentration of aerosol particles and black carbon concentration increased by one-two orders higher relative to background conditions at Syowa Station, while surface O_3 concentration simultaneously dropped especially after polar sunrise. Major aerosol constituents in the haze phenomenon were sea-salts (e.g., Na^+ and Cl^-). From the trajectory analysis and NAAPS model, the plumes from biomass burning in South America and southern Africa were transported to Syowa Station, Antarctic coast, during eastward (occasionally westward) approach of cyclones in the Southern Ocean. Thus, poleward flow of the plume from mid-latitudes and injection of sea-salt particles during the transport may lead to the Antarctic haze phenomenon at Syowa Station. The difference of O_3 concentration between the background and the haze conditions tended to be larger in spring (polar sunrise) relative to that in winter. Because enhancement of sea-salt particles can play an important role as an additional source of reactive halogen species, the haze episodes might make a significant contribution to surface O_3 depletion during the polar sunrise on the Antarctic coast.

  85. Seasonal variation and volatility of ultra-fine particles in coastal Antarctic troposphere

    Hara Keiichiro, Osada Kazuo, Nishita-Hara Chiharu, Yabuki Masanori, Hayashi Masahiko, Yamanouchi Takashi, Wada Makoto, Shiobara Masataka

    Antarctic record   Vol. 54 ( 0 ) page: 541-553   2010.12

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    The Size distribution and volatility of ultrafine aerosol particles were measured at Syowa Station during the 46-47 Japanese Antarctic Research Expeditions. During the summer, most of the ultrafine particles were volatile particles, which were composed of H_2SO_4, CH_3SO_3H and sulfates bi-sulfates. The abundance of non-volatile particles was 〜 20% during the summer, increasing to>90% in winter-spring. Non-volatile particles in winter were dominantly sea-salt particles. Some ultrafine sea-salt particles might be released from sea-ice. When air mass was transported from the free troposphere over the Antarctic continent, the abundance of non-volatile particles dropped to<30% even in winter.

  86. Seasonal variations and vertical features of aerosol particles in the Antarctic troposphere

    Hara Keiichiro, Osada Kazuo, Nishita-Hara Chiharu, Yamanouchi Takashi, Hayashi Masahiko

    Antarctic record   Vol. 54 ( 0 ) page: 731-759   2010.12

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    Tethered balloon-borne aerosol measurements were carried out at Syowa Station, Antarctica during the 46th Japanese Antarctic Research Expedition. CN concentration had a maximum in the summer, whereas the number concentrations of fine particles (D_p>0.3 μm) and coarse particles (D_p>2.0 μm) increased during the winter-spring. The range of CN concentration was 30-2200 cm^<-3> near the surface (surface-500 m) and 7-7250 cm^<-3> in the lower free troposphere (>1500 m). During the austral summer, higher CN concentration was often observed in the lower free troposphere. Frequent appearance of higher CN concentration in the free troposphere relative to the surface measurements strongly suggests that new particle formation in the Antarctic regions occurs in the lower free troposphere. Single particle analysis indicated that most of the aerosol particles during the winter were composed of Mg-enriched sea-salt particles originated from sea-salt fractionation on the sea-ice and their modified particles by NO_3^<-> and SO_4^<2->. This suggests that sea-salt fractionation on sea-ice and modification of sea-salt particles were affected greatly by aerosol hygroscopicity during the winter. Antarctic haze layer was observed not only in the boundary layer but also in the lower free troposphere.

  87. Chemistry of sea-salt particles and sea-salt fractionation in Antarctic region

    Hara Keiichiro, Osada Kazuo, Hayashi Masahiko, Yabuki Masanori, Hashida Gen, Yamanouchi Takashi

    Antarctic record   Vol. 54 ( 0 ) page: 668-696   2010.12

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    Observations of aerosol constituents and acidic gases were carried out at Syowa Station (1997-1998 and 2003-2006; JARE-38〜 39, and JARE-44〜 47) and Dome Fuji Station (1997, JARE-38). Seasonal variations and size distribution of sea-salt particles were compared between coastal and inland stations. Seasonal variations of the concentrations of sea-salt particles showed a minimum in the austral summer and higher during the winter at both stations due to strong winds and long-range transport. Sea-salt particles were mostly distributed in fine (D_p: 0.2-2.0 μm) and ultra-fine (D_p<0.2 μm) modes at Syowa Station. Particulate Cl^- and Br^- are liberated preferentially from sea-salt particles through the heterogeneous reactions at Syowa and Dome Fuji Stations in the summer. The molar ratio of Cl^- Na^+ and Br^- Na^+ at Syowa Station decreased to ca. 0.5 and 〜0, respectively, in summer. Fewer sea-salt particles were modified at Syowa Station during the winter, whereas sea-salt particles were modified through the year at Dome Fuji Station. In particular, sea-salt particles were modified with NO_3^- and its precursors at Dome Fuji Station during the winter. The concentrations of gaseous inorganic chlorine species (mostly HCl) and bromine species at Syowa Station were 0.2-9.4 nmol m^<-3> and below the detection limit (BDL)-1.5 nmol m^<-3>, respectively. Sea-salt fractionation (SO_4^<2-> depletion) due to Mirabilite formation was identified not only at Syowa Station but also at Dome Fuji Station. Seasonal variation of molar ratio of Mg^<2+> Na^+ showed higher ratios at lower temperature. The range and temperature dependence of Mg^<2+> Na^+ strongly suggested that other sea-salt fractionation (e.g., formation of gypsum and hydrohalite) occurred in the Antarctic coasts in addition to Mirabilite formation. Because of different seasonal variation and range of Mg^<2+> Na^+ between Dome Fuji and Syowa Stations, sea-salt fractionation may proceed even in the inland area.

  88. Seasonal variation of coarse aerosol particle concentration at Syowa Station, Antarctica

    Osada Kazuo, Hayashi Masahiko, Hara Keiichiro, Yabuki Masanori, Wada Makoto, Shiobara Masataka, Yamanouchi Takashi, Fujita Kouji

    Antarctic record   Vol. 54 ( 0 ) page: 487-497   2010.12

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    Number-size distributions (D_p>0.3 μm) of atmospheric aerosol particles were measured at Syowa Station, Antarctica, from February 2004 to January 2006. Volume concentrations of coarse particles (D_p 1.0-5.0 μm) were low in December to January and high in the rest of the year. To identify factors controlling the seasonal variation of coarse particle concentrations at Syowa Station, seasonal variations of wind speed distribution over the Southern Ocean, sea ice extent, wind speed at the edge of sea ice and at Syowa Station, and seasonal patterns of backward air trajectories were compared with the volume concentrations of coarse particles. Patterns of backward air trajectories and changes in size distributions of coarse particles associated with sea ice extent suggest changes in major source areas of sea salt particles observed at Syowa Station: coastal areas near Syowa in February and March, but far north of the sea ice edge, around 60゜ south, in October.

  89. Observations of atmospheric aerosol particles over the Antarctic ocean by ocean research vessels

    Osada Kazuo, Hara Keiichiro, Yabuki Masanori, Nishita-Hara Chiharu, Kobayashi Hiroshi, Miura Kazuhiko, Ueda Sayako, Hayashi Masahiko, Hashida Gen, Shiobara Masataka, Wada Makoto, Yamanouchi Takashi

    Antarctic record   Vol. 54 ( 0 ) page: 449-464   2010.12

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    To investigate spatial and temporal variation of number-size distribution of atmospheric aerosol particles in the Antarctic Ocean, atmospheric observations were conducted on research vessels: Hakuho-maru, Tangaroa, and Umitaka-maru. Concentrations of ionic constituents in aerosols and precursor gases (SO_2 and NH_3) were also measured during the cruises. Concentrations of nucleation mode particles (<20 nm in diameter) were often high under the conditions of very low number concentrations of preexisting aerosol particles larger than 0.1 μm in diameter, when the ocean was calm. Nucleation mode particles did not appear when concentrations of preexisting aerosols were high. Major ionic concentrations of aerosols at Lutzow-Holmbukta observed by Umitaka-maru in January 2005 were almost the same as average values of those in January at Syowa Station. Especially for short-term increasing events in condensation nucleus concentration, large differences were found for number size-distributions of nucleation and Aitken mode particles between Syowa Station and Umitaka-maru in Lutzow-Holmbukta.

  90. Electroconductivity of fallen and drifting snow at Syowa Station, Antarctica

    Osada Kazuo, Hara Keiichiro, Yabuki Masanori, Adachi Masaki

    Antarctic record   Vol. 54 ( 0 ) page: 697-703   2010.12

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    Samples of fallen snow, drifting snow and deposited snow were obtained at Syowa Station from April 2003 to October 2006. Electroconductivity of the meltwater was measured. The electroconductivities of the samples for the fallen snow under weak wind condition were mostly below several tens of μS cm, whereas much higher values were obtained for the drifting snow samples under strong wind condition with seasonal variation: maximum (several hundred to thousands) in April to July, then decreasing to a few hundred after September. Higher electro conductivities of the drifting snow samples correlated well with breakup of sea ice windward of Syowa Station. Lower values were obtained after snow accumulated on sea ice at Kita-no-ura, windward bay area north-east and offshore of Syowa Station. These suggest that brine from sea ice changes the electroconductivity of drifting snow.

  91. Black carbon at a coastal Antarctic station (Syowa Station): Seasonal variation and transport processes

    Hara K., Osada K., Yabuki M., Hayashi M., Yamanouchi T., Shiobara M., Wada M.

    Antarctic Record   Vol. 54 ( SPEC. ISSUE ) page: 562 - 592   2010.12

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    Measurement of atmospheric black carbon (BC) was carried out at Syowa Station Antarctica (69°00′S, 39°35′E) from February 2004 until January 2007. The BC concentration at Syowa Station ranged from below detection to 176 ng m -3. Higher BC concentrations were observed frequently from April until October. Increase of BC concentration may be associated with poleward flow due to the approach of a cyclone and/or blocking event during winter-spring. The BC-rich air masses traveled through the lower troposphere from the Atlantic and Indian Oceans to Syowa (Antarctic coast). During the summer (November-February), the BC concentration showed a diurnal variation together with surface wind speed and increased in the presence of katabatic wind from the Antarctic continent. Considering the low BC source strength over the Antarctic continent, the higher BC concentration in the continental air (katabatic wind) might be caused by long range transport of BC via the free troposphere from mid-and low-latitudes. The seasonal variation of BC at Syowa Station had a maximum in July-September, while at the other coastal stations (Halley, Neumayer, and Ferraz) and a continental station (Amundsen-Scott), the maximum occurred in October. This difference may result from different transport pathways, significant contribution of source regions and scavenging of BC by precipitation during the transport from the source regions. During the austral summer, long-range transport of BC via the free troposphere is likely to make an important contribution to the ambient BC concentration along the Antarctic coasts. © 2010 National Institute of Polar Research.

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  92. Mixing states of cloud interstitial particles between water-soluble and insoluble materials at Mt. Tateyama, Japan: effects of meteorological conditions Reviewed

    Ueda, S., K. Osada, K. Okada

      Vol. 掲載決定   2010.10

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  93. Haze episodes at Syowa Station, coastal Antarctica: Where did they come from?

    Hara K., Osada K., Yabuki M., Hashida G., Yamanouchi T., Hayashi M., Shiobara M., Nishita C., Wada M.

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   Vol. 115 ( 14 )   2010.7

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    DOI: 10.1029/2009JD012582

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  94. Deposition processes of ionic constituents to snow cover

    Osada K., Shido Y., Iida H., Kido M.

    ATMOSPHERIC ENVIRONMENT   Vol. 44 ( 3 ) page: 347-353   2010.1

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    DOI: 10.1016/j.atmosenv.2009.10.031

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  95. Observations of atmospheric aerosol particles over the Antarctic Ocean by ocean research vessels

    Osada, Kazuo, Hara, Keiichiro, Yabuki, Masanori, Nishita-Hara, Chiharu, Kobayashi, Hiroshi, Miura, Kazuhiko, Ueda, Sayako, Hayashi, Masahiko, Hashida, Gen, Shiobara, Masataka, Wada, Makoto, Yamanouchi, Takashi

    Antarctic Record   Vol. 54 ( Sp. Iss. SI ) page: .   2010

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  96. 昭和基地で観測された大気エアロゾル中の金属成分および炭素成分の季節変動

    小林拓, 原圭一郎, 塩原匡貴, 山内恭, 長田和雄, 太田幸雄

    南極資料     page: 54, 554-561   2010

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  97. 南極沿岸域でのブラックカーボン-季節変化と輸送過程

    原圭一郎, 長田和雄, 矢吹正教, 林政彦, 山内恭, 塩原匡貴, 和田誠

    南極資料     page: 54, 562-592   2010

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  98. 南極・昭和基地におけるサブミクロン粒子粒径分布の季節変化

    長田和雄, 西田千春, 原圭一郎, 矢吹正教, 塩原匡貴, 和田誠, 山内恭, 林政彦

    南極資料     page: 54, 530-540   2010

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  99. 南極対流圏中の超微小粒子の揮発特性とその季節変化

    原圭一郎, 長田和雄, 西田千春, 矢吹正教, 林政彦, 山内恭, 和田誠, 塩原匡貴

    南極資料     page: 54, 541-553   2010

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  100. *Impact of Chinese anthropogenic emissions on submicrometer aerosol concentration at Mt. Tateyama, Japan Reviewed

    K. Osada, T. Ohara, I. Uno, M. Kido and H. Iida

    Atmospheric Chemistry and Physics   Vol. 9   page: 9111-9120   2009.12

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  101. 乗鞍岳における大気エアロゾルの観測-粒子数粒径分布の変化とその要因 Invited Reviewed

    西田千春・長田和雄,

    エアロゾル研究   Vol. 24   page: 105-111   2009.6

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    乗鞍岳における大気エアロゾルの観測結果、特に、粒子数粒径分布の変化とその要因に焦点を当てて解説した。

  102. Global distribution and seasonal concentration change of methyl iodide in the atmosphere Reviewed

    Yokouchi, Y., K. Osada, M. Wada, F. Hasebe, M. Agama, R. Murakami, H. Mukai, Y. Nojiri, Y. Inuzuka

    J. Geophys. Res.   Vol. 113 ( D18311 ) page: doi:10.1029/2008JD009861   2008.9

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  103. Factors controlling sea salt modification and dry deposition of non-sea-salt components to the ocean Reviewed

    Kawakami, N., K. Osada, C. Nishita, M. Yabuki, H. Kobayashi, K. Hara, and M. Shiobara

    J. Geophys. Res.   Vol. 113 ( D14216 ) page: doi:10.1029/2007JD009410   2008.7

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  104. Nucleation mode particles in up-slope valley winds at Mt. Norikura, Japan: implications for the vertical extent of new particle formation events in the lower troposphere Reviewed

    Nishita, C., K. Osada, K. Matsunaga, Y. Iwasaka

    J. Geophys. Res.   Vol. 113 ( D06202 ) page: doi:10.1029/2007JD009302   2008.3

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  105. Preferential settling of elongated mineral dust particles in the atmosphere Reviewed

    GEOPHYSICAL RESEARCH LETTERS   Vol. 34   page: doi:10.1029/2007GL030262, 2007   2007.9

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  106. *Temporal variation of water-soluble ions of free tropospheric aerosol particles over central Japan Reviewed

    Tellus   Vol. 59B   page: 742-754   2007.8

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    Free tropospheric aerosol particles were collected at Mt. Norikura (36.1°N, 137.5°E, 2770 m a.s.l.) in Japan during May–October in 2001 and 2002. An automated sequential daily nighttime (00–06 a.m.) sampler collected free tropospheric aerosols. Average, median, SD, minimum and maximum concentrations of total ionic weight of the 114 samples were, respectively, 3.9, 2.8, 3.7, 0.2 and 23.2 μg m3. Transport conditions were analysed using backward air trajectory with precipitation amounts along the trajectory. Results suggest that low aerosol mass concentration causes are (1) descending trajectories and (2) precipitation scavenging during transport without contacting boundary layer atmosphere until arrival. It is suggested that, without precipitation scavenging after entrainment into the free troposphere, aerosol transport from active emissions at the surface enhances mass concentration at Mt. Norikura.

    Average concentrations of NO3, non-sea-salt (nss)K+ and C2O42 are high in March–June and low in winter. The highest average nssSO42 concentration occurs in summer; it is high from spring through fall. Seasonal variation of NH4+ concentrations resembles that of nssSO42, but the concentrations' molar ratio (NH4+/nssSO42) is high (ca. 2) in spring and decreases to 1 in winter. Seasonal variation of NH4+ + NH3 concentration agrees with that of NH3 emissions in China.

  107. Asian Dust Invited Reviewed

    K. Osada

    Tenki   Vol. 54 ( 8 ) page: 697-700   2007.8

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  108. Number-size distributions of free tropospheric aerosol particles at Mt. Norikura, Japan: effects of precipitation and air-mass transportation pathways Reviewed

    Nishita, C., K. Osada, K. Matsunaga, Y. Iwasaka

    J. Geophys. Res.   Vol. 112   page: doi:10.1029/2006JD007969, 2007   2007.5

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    Number-size distributions of free tropospheric aerosol particles of 9–300-nm diameter were observed at Mt. Norikura (36.1°N, 137.5°E, 2770 m a.s.l.) in central Japan in August and September 2002. We observed two distinct air masses transported from over the Pacific Ocean and continental Asia. Size distributions of aerosol particles were analyzed in terms of their relation to the air mass transportation pathway, cumulative precipitation amount in the air mass for the last 24 h, and local precipitation rate. Particle concentrations of the accumulation mode range (100–300 nm) decreased by an order of magnitude when cumulative precipitation amount increased from 0 to 20 mm. The cumulative precipitation amount is suggested as an important factor to modify the size distribution by decreasing particle concentration. Considering data for air masses without experience of precipitation scavenging before arrival, concentrations of accumulation mode particles were almost identical (approximately 400 cm−3) in air masses transported from over the Pacific Ocean and continental Asia. Concentration of Aitken mode particles was high (890 cm−3 as a median value) in the air mass subsiding from over the subtropical Pacific Ocean (> 4 km a.s.l.). Based on the relationship with the controlling factors described above, this study provides number-size distribution parameters of free tropospheric aerosol particles in the west Pacific area.

  109. Water-insoluble particles in spring snow at Mt. Tateyama, Japan: Characteristics of the shape factors and size distribution in relation with their origin and transportation Reviewed

    Li, Jingmin and K. Osada

    J. Meteorol. Soc. Jpn   Vol. 85   page: 137-149   2007.4

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    The number-size distribution and shape factors of water-insoluble particles (WIP) in four dirty snow layers in the spring of 2001 at Mt. Tateyama, Japan, were analyzed using scanning electron microscopy, and using optical microscopy with a digital camera. Results show that the median aspect ratio (ratio of the longest dimension b to the orthogonal width a; b/a) of the WIP varied within 1.22-1.31. Only a few particles with an aspect ratio of more than 2.5 were observed. The median circularity factor (4πS/l2; S is projection area, and l is periphery length) varied from 0.83-0.97.
    Combined with backward air trajectories, visibility reducing surface weather reports, additional results of rain containing Saharan dust and dry deposition samples, the number and shape factor distributions versus particle size were characterized as (1) narrower distributions of number-size and shape factors for the Saharan dust, and (2) bi-modal number-size distribution for dry deposited dust. Results suggest that the proportions of nearly spherical (higher circularity nearly 1) and less elongated (lower aspect ratio close to 1) particles were higher in the sample that had been transported a longer distance from the dust source areas.

  110. Lower Tropospheric Vertical Distribution of Aerosol Particles over Syowa Station, Antarctica from Spring to Summer in 2004 Reviewed

    Osada, K., K. Hara, M. Wada, T. Yamanouchi, K. Matsunaga

    Polar Meteorol. Glaciol   Vol. 20   page: 16-27   2006.12

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  111. Aerosol constituents and their spatial distribution in the free troposphere of coastal Antarctic regions Reviewed

    Hara, K., Y. Iwasaka, M. Wada, T. Ihara, H. Shiba, K. Osada, T. Yamanouchi

    J. Geophys. Res   Vol. 111   page: doi:10.1029/2005JD006591   2006.8

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  112. Spatial distributions of volatile sulfur compounds in surface seawater and overlying atmosphere in the northwestern Pacific Ocean, eastern Indian Ocean, and Southern Ocean Reviewed

    Inomata, Y., Hayashi, M., Osada, K., Iwasaka, Y.

    Global Biogeochemical Cycle   Vol. 20   page: doi:10.1029/2005GB002518   2006.6

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  113. Vertical distributions of particles and sulfur gases (volatile sulfur compounds and SO2) over East Asia: Comparison with two aircraft-borne measurements under the Asian continental outflow in spring and winter Reviewed

    Y. Inomata, Y. Iwasaka, K. Osada, M. Hayashi, I. Mori, M. Kido, K. Hara, T. Sakai

    Atmospheric Environment   Vol. 40   page: 430-444   2006.1

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  114. Variations of constituents of individual sea-salt particles at Syowa station, Antarctica Reviewed

      Vol. 57B   page: 230-246   2005

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  115. Mineral Dust Layers in Snow at Mt. Tateyama, Central Japan: Formation Processes and Characteristics Reviewed

    K. Osada, H. Iida, M. Kido, K. Matsunaga, Y. Iwasaka

    Tellus   Vol. 56B   page: 382-392   2004

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  116. Chemistry of sea-salt particles and inorganic halogen species in the Antarctic regions: Compositional differences between coastal and inland stations Reviewed

    K. Hara, K. Osada, M. Kido, M. Hayashi, K. Matsunaga, Y. Iwasaka, T. Yamanouchi, G. Hashida, T. Fukatsu

    J. Geophys. Res.   Vol. 109   page: doi:10.1029/2004JD004713   2004

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  117. Seasonal variation of free tropospheric aerosol particles at Mt. Tateyama, central Japan Reviewed

    Osada, K.; Kido, M.; Iida, H.; Matsunaga, K.; Iwasaka, Y.; Nagatani, M.; Nakada, H

    J. Geophys. Res     page: doi:10.1029/2003JD003544   2003

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  118. Changes in ionic constituents of free tropospheric aerosol particles obtained at Mt. Norikura (2770 m a. s. l.), central Japan, during the Shurin period in 2000 Reviewed

    K. Osada, M. Kido, C. Nishita, K. Matsunaga, Y. Iwasaka, M. Nagatani, H. Nakada

    Atmos. Environ.   Vol. 36   page: 5469-5477   2002

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  119. Number-size distributions of Atmospheric aerosol particles (10<Dp<265 nm) at Ny-Alesund, Norwegian Arctic: Their relationship with air mass history Reviewed

    C. Nishita, K. Osada, K. Hara, M. Kido, M. Wada, T. Shibata, Y. Iwasaka

    Polar Meteorol. Glaciol.   Vol. 15   page: 67-77   2002

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  120. Sulfate depletion in snow over sea ice near Syowa Station, Antarctica, in relation to the origin of sulfate depleted sea salt aerosol particles in winter Reviewed

    K. Osada, K. Hara, M. Kido, H. Kai, T. Yamanouchi, G. Hashida, K. Matsunaga, Y. Iwasaka,

    Polar Meteorol. Glaciol.   Vol. 15   page: 21-31   2001

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  121. Diurnal variatiion of ionic aerosol species and water-soluble gas concentrations at a high elevation site in the Japan Reviewed

    Kido, M., K. Osada, K. Matsunaga, Y. Iwasaka

    J. Geophys. Res.   Vol. 106   page: 17335-17345   2001

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  122. Temporal change in ammonium/sulfate ratios for free tropospheric aerosols from early winter to spring at a high elevation site in the Japanese Alps Reviewed

    Kido, M., K. Osada, K. Matsunaga, Y. Iwasaka

    J. Environ. Chem.   Vol. 11   page: 35-43   2001

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  123. 立山・室堂平の春季積雪に含まれる化学成分の深度分布 Reviewed

    長田和雄・木戸瑞佳・飯田肇・矢吹裕伯・幸島司郎・川田邦夫・中尾正義

    雪氷   Vol. 62   page: 3-14   2000

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  124. 航空機と山岳大気観測から見た自由対流圏エアロゾル Invited

    長田和雄

    エアロゾル研究   Vol. 15 ( 4 ) page: 335-342   2000

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  125. Fractionation of inorganic nitrates in winter Arctic troposphere -Coarse aerosol particles containing inorganic nitrates- Reviewed

    Hara, K., K. Osada, M. Hayashi, K. Matsunaga, Y. Iwasaka, K. Furuya

    J. Geophys. Res.   Vol. 104   page: 23671-23679   1999

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  126. Ionic constituents in aerosol particles at Syowa station, east Antarctica, during 1996 Reviewed

    K. Osada, M. Hayashi, H. Ui, and Y. Iwasaka

    Polar Meteorology and Glaciology   Vol. 12   page: 49-57   1998

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  127. Dating of seasonal snow layers at Murodo, Mt. Tateyama, Japan Reviewed

    Seppyo   Vol. 59 ( 3 ) page: 181-188   1997

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  128. Variation of concentrations of sulface, methane sulfonate and sulfur dioxide at Ny-(]J1009[)lesund in 1995/96 winter Reviewed

    Hara, K., K. Osada, M. Hayashi, K. Matsunaga and Y. Iwasaka

    Proceedings of the NIPR Symposium on Polar Meteorolog and Glaciology   Vol. 11   page: 127-137   1997

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  129. Major ionic and trace metal constituents in snow at Ester Dome, Fairbanks, Alaska Reviewed

    Osada, K., K. Matsunaga, T. Shibata, H. Adachi and Y. Iwasaka

    Journal of Geomagnetism and Geoelectricity   Vol. 48   page: 1179-1188   1996

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  130. Methanesulfonate and non-sea-salt sulfate in drifting-snow from east Queen Maud Land, East Antarctica Reviewed

    K. Osada

    Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology   Vol. 10   page: 111-118   1996

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  131. Ionic constituents in surface snow samples obtained by Antarctic Walk Expeditim, summer of 1992/93 Reviewed

    Osada, K., K. Matsunaga, I. Mori, Y. Iwasaka, K. Yoshikawa

    Journal of Geomagnetism and Geoelectricity   Vol. 48   page: 1189-1196   1996

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  132. *A 10 Century comparison of prominent bipolar volcanic events in Ice Core Reviewed

    Langway, C. C. Jr. , K. Osada, H. B. Clausen, C. U. Hammer, H. Shoji

    Journal of Geophysical Research   Vol. 100   page: 16241-16247   1995

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    Measurements of key chemical and physical parameters made along continuous and selected long sections of polar ice cores provide reliable past snow accumulation rates and other environmental records. The prime accumulation indicators include variations found in the stable isotopes, ionic constituents, and acidity concentration levels; and physical changes in the strata and structure. Cross correlations of the time series curves resulting from multiparameter analyses of ice cores from Antarctica (NBY89, SP78, BS68) and Greenland (CR74, D3 81, D3 18C) have been made. The results permit construction of a bipolar chemical stratigraphy chronology of volcanic events that is coherent with the δ18O and Electrical Conductivity Method data sets and consistent back-in-time with historically recorded volcanic activity. A bihemispheric comparison of high non-sea-salt SO2−4 peaks shows strong correlation at 1885, 1836, 1816, 1810, 1459, 1346, 1287, 1278, 1259, 1228, and 1168 A.D. at time of snow deposit. The prominent 1259 A.D. volcanic signal appears to be a significant bipolar ice core index horizon.

  133. Seasonal variations of major ionic concentration levels in drifting-snow samples obtained from east Dronning Maud Land, East Autocratic Reviewed

    K. Osada

    Annals of Glaciology   Vol. 20   page: 226-230   1994

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  134. New Chemical stratigraphy over the last millennium for Byrd Station, Antarctica Reviewed

    Langway, C. C. Jr., K. Osada, H. B. Clausen, C. U. Hammer, H. Shoji and A. Mitani

    Tellus   Vol. 46B   page: 40-51   1994

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  135. Background levels of formate and other ions in ice cores from inland Greenland. Reviewed

    K. Osada & C. C. Langway, Jr.

    Geophysical Research Letters   Vol. 20   page: 2647-2650   1993

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  136. Transport rate of Na+, Cl-, NO-3 and SO2-4 by drifting snow at Mizuho Station, Antarctica. Reviewed

    Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology   Vol. 3   page: 43-50   1990

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  137. Chemical composition of snow drift on Mizuho Plateau, Antarctica. Reviewed

    Osada, K., H. Ohmae, F. Nishio, K. Higuchi and S. Kanamori

    Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology   Vol. 2   page: 70-78   1989

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  138. Sea salt in deposited snow and sea ice and snow drift Reviewed

    Antarctic Research   Vol. 32   page: 17-24   1988

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Books 15

  1. 南極の大気エアロゾル(南極読本 改訂増補)

    長田和雄( Role: Contributor ,  南極の大気エアロゾル)

    成山堂書店  2019.11  ( ISBN:978-4-425-94812-3

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    Total pages:270   Responsible for pages:205-209   Language:Japanese

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  2. 南極読本 改訂増補

    長田和雄( Role: Contributor ,  南極の大気エアロゾル)

    成山堂書店  2019.11 

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    Responsible for pages:205-209   Language:Japanese Book type:General book, introductory book for general audience

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  3. 「大気環境の事典」の「粒子の計測・分析」

    長田和雄( Role: Contributor ,  粒子の計測・分析)

    大気環境学会・朝倉書店  2019.9 

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    Responsible for pages:72-73  

  4. 黄砂沈着量(黄砂- 健康・生活環境への影響と対策)

    黒崎泰典, 黒沢洋一, 篠田雅人, 山中典和( Role: Contributor ,  2-3-1 黄砂沈着量)

    丸善出版  2016.3  ( ISBN:9784621300299

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    Total pages:150   Responsible for pages:60-63   Language:Japanese

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  5. 黄砂- 健康・生活環境への影響と対策・黄砂沈着量

    黒崎泰典, 黒沢洋一, 篠田雅人, 山中典和( Role: Contributor)

    丸善出版  2016.3  ( ISBN:9784621300299

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    Total pages:150   Responsible for pages:60-63   Language:Japanese Book type:Scholarly book

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  6. 平均より高い値や低い値がでやすい地形はあるか(みんなが知りたいPM2.5の疑問25)

    長田和雄, 日本エアロゾル学会, 畠山史郎, 三浦和彦, 編著( Role: Sole author ,  平均より高い値や低い値がでやすい地形はあるか)

    成山堂書店  2014.5 

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    Language:Japanese

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  7. 平均より高い値や低い値がでやすい地形はあるか,「みんなが知りたいPM2.5の疑問25」

    長田和雄, 日本エアロゾル学会, 畠山史郎, 三浦和彦, 編著( Role: Sole author)

    成山堂書店  2014.5 

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    Responsible for pages:82-86   Language:Japanese

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  8. エアロゾルを感じる-青い空と白い息-(南極読本)

    長田和雄(分担執筆)( Role: Joint author)

    成山堂書店  2013 

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    Language:Japanese

  9. 大気物質の沈着(地球と宇宙の化学事典)

    日本地球化学会編集( Role: Sole author)

    朝倉書店  2012.9 

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    Language:Japanese

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  10. *高地・山岳の利用、「黄砂」、分担執筆、岩坂泰信・西川雅高・山田丸・洪天祥(編)

    長田和雄( Role: Sole author)

    古今書院  2009.7 

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    Language:Japanese

    日本の山岳での黄砂観測例について紹介した

  11. 南極観測隊-南極に情熱を燃やした若者たちの記録・「エアロゾル観測小屋の設置」

    長田和雄、南極OB会・観測50周年記念事業委員会 編集( Role: Sole author)

    技法堂出版  2006.11 

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    Language:Japanese

  12. 南極大図鑑・「南極のエアロゾル」

    監修( Role: Joint author)

    小学館  2006.10 

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    Language:Japanese

  13. 地球環境の視点-南極と富士山頂(変わる富士山測候所)

    長田和雄(編:江戸川大学 土器屋由紀子ゼミ)( Role: Joint author)

    春風社  2004.12 

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    Language:Japanese

  14. 山の大気環境科学

    土器屋由紀子,岩坂泰信,長田和雄,直江寛明( Role: Sole author)

    養賢堂  2001.3  ( ISBN:4842500727

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    Language:Japanese

  15. 北極圏の大気科学

    岩坂泰信(編)( Role: Sole author)

    名古屋大学出版会  2000.2  ( ISBN:4815803757

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    Language:Japanese

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MISC 5

  1. 黄砂 Invited

    長田和雄, 原圭一郎, 上田紗也子

    ビルと環境   ( 184 ) page: 52 - 60   2024.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

  2. 大気と海から考える環境問題・政策ー環境変化と人間活動ー Invited

    増沢陽子, 石坂丞二, 長田和雄

    環   Vol. 44 ( spring ) page: 2 - 6   2023.3

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    Authorship:Last author   Language:Japanese  

  3. 研究テーマの移り変わり︓洞窟から地吹雪経由、アンモニア Invited

    長田和雄

    地球環境科学と私   ( 28 )   2021.3

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    Authorship:Lead author   Language:Japanese  

  4. Aerosolpedia

    OSADA Kazuo

    Earozoru Kenkyu   Vol. 36 ( 1 ) page: 1 - 1   2021.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  5. Introduction to the Feature Articles: Long-Term Observations of Atmospheric Aerosol Concentration and Changes in Anthropogenic Emissions

    OSADA Kazuo

    Earozoru Kenkyu   Vol. 33 ( 2 ) page: 76-76   2018.6

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    Authorship:Lead author   Language:Japanese  

    DOI: 10.11203/jar.33.76

Presentations 24

  1. 川崎市と東京都江東区における時別NH3濃度

    長田和雄, 菊地美加, 重水洋平, 沼田和也, 鈴木義浩, 小林勉, 福﨑有希子, 武田麻由子, 齋藤伸治, 鶴丸央

    第64回大気環境学会年会  2023.9.15  大気環境学会

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば   Country:Japan  

  2. 自動車交通量と人流の抑制は都市大気のNH3濃度低下に寄与するか

    長田和雄、齊藤伸治、鶴丸央、板橋秀一

    第63回大気環境学会年会  2022.9.15  大気環境学会

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪公立大学   Country:Japan  

  3. 大気中のアンモニアとエアロゾル粒子 Invited

    長田和雄

    第70回環日セミナー  2022.6.16  環日本海域環境研究センター

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    Event date: 2022.6

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

    Venue: 石川県能美市   Country:Japan  

  4. 大気アンモニア濃度の短期減少イベントとその要因

    長田和雄,鶴丸 央,齊藤伸治

    第62回大気環境学会年会  2021.9.15  大気環境学会

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    Event date: 2021.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  5. 大気アンモニア濃度の高時間分解能連続モニタリング Invited

    長田和雄,鶴丸 央,齊藤伸治

    第62回大気環境学会年会  2021.9.15  大気環境学会・環境大気モニタリング分科会

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  6. バッテリー駆動型パッシブサンプラー自動切替装置の開発:トルエン等の局所発生源探索

    長田 和雄,小山 慎一,星 純也,橳島 智恵子

    第62回大気環境学会年会  2021.9.15  大気環境学会

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    Event date: 2021.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:オンライン   Country:Japan  

  7. 山と街での大気エアロゾル粒子とアンモニアの研究

    長田和雄

    大気科学研究部門第5回成果報告会  2021.3.13  東京理科大学総合研究院大気科学研究部門

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    Event date: 2021.3

    Language:Japanese  

    Venue:東京理科大学(オンライン開催)  

  8. Direct measurement of aerosol acidity using pH test paper

    Qinping Song and Kazuo Osada

    2020.11 

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    Event date: 2020.11

    Language:English   Presentation type:Poster presentation  

  9. 大気アンモニア濃度のリアルタイム計測:湿式法と乾式法の比較

    長田 和雄,齊藤 伸治,鶴丸 央,中村 稜雅

    第61回大気環境学会  大気環境学会

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    Event date: 2020.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:信州大学  

  10. 東京における自動車からのNH3排出率

    長田 和雄, 齊藤 伸治, 鶴丸 央, 星 純也

    第60回大気環境学会年会  大気環境学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京農工大学  

  11. 2018年夏季における東京臨海部の大気汚染物質の挙動

    齋藤伸治,鶴丸央,星純也,久恒邦裕,長田和雄,河内奨,清水彩加,杉俣哲太朗

    第60回大気環境学会年会  大気環境学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京農工大学  

  12. 名古屋におけるエアロゾル酸性度の季節変化と変動要因

    宋 秦平・長田 和雄

    第60回大気環境学会年会  大気環境学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京農工大学  

  13. ニューラルネットワークを用いた簡易PM2.5計測器のデータ補正について

    久恒邦裕,山神真紀子,長田和雄

    第60回大気環境学会年会  大気環境学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京農工大学  

  14. 名古屋市南部における海風時PM2.5の発生源推定

    山神真紀子,久恒邦裕,池盛文数,長田和雄

    第60回大気環境学会年会  大気環境学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京農工大学  

  15. 東京都江東区におけるNH3濃度の季節変化

    長田 和雄, 齊藤 伸治, 鶴丸 央, 星 純也

    第60回大気環境学会年会  大気環境学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京農工大学  

  16. 名古屋大学におけるNH3とHNO3、粒径別イオン成分濃度の季節変化

    長田 和雄・宋 秦平

    第36回エアロゾル科学・技術研究討論会  日本エアロゾル学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学  

  17. 鳥取沿岸域における窒素酸化物種の動態解析

    野尻亮太・松岡雅也・定永靖宗・長田和雄・黒崎泰典・梶野瑞王

    第36回エアロゾル科学・技術研究討論会  日本エアロゾル学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学  

  18. 東京都心部におけるPM2.5の風向別サンプリング

    齋藤伸治・星純也・長田和雄

    第36回エアロゾル科学・技術研究討論会  日本エアロゾル学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学  

  19. 硫酸塩粒子の形態:大気エアロゾル粒子に観られる形態と室内実験による再現

    上田紗也子・長田和雄・宋秦平・高見昭憲・中山智喜・松木篤・岩本洋子・足立光司

    第36回エアロゾル科学・技術研究討論会  日本エアロゾル学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島大学  

  20. 名古屋市における2017年2月および3月に見られたPM2.5高濃度事例解析

    久恒 邦裕, 池盛 文数, 山神 真紀子, 長田 和雄

    大気環境学会年会講演要旨集  2018.8  (公社)大気環境学会

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    researchmap

  21. 名古屋市におけるPM2.5の化学成分の長期変動(2003〜2017年度)

    山神 真紀子, 久恒 邦裕, 池盛 文数, 森 健次, 長田 和雄, 上田 佳代

    大気環境学会年会講演要旨集  2018.8  (公社)大気環境学会

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  22. 有機トレーサー成分を用いた一次・二次有機エアロゾルの発生源寄与解析

    池盛 文数, 久恒 邦裕, 山神 真紀子, 長田 和雄

    大気環境学会年会講演要旨集  2018.8  (公社)大気環境学会

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  23. 名古屋市南部における海陸風別PM2.5の化学成分(2)

    山神 真紀子, 池盛 文数, 久恒 邦裕, 長田 和雄

    大気環境学会年会講演要旨集  2018.8  (公社)大気環境学会

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    Event date: 2018.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  24. 南極昭和基地におけるエアロゾル粒径分布の季節変化

    長田和雄・原圭一郎・塩原匡貴・西田千春・松永捷司・山内恭

    エアロゾル科学技術研究討論会 

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    Event date: 2005.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

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Research Project for Joint Research, Competitive Funding, etc. 4

  1. バックグラウンド濃度の把握によるVOC 等大気汚染物質予測精度の向上と地域排出源による健康リスク評価の高精度化

    Grant number:5MF-2203  2022.4 - 2025.3

    環境研究総合推進費 

    星 純也、橳島智恵子、齊藤伸治、鶴丸央、長田和雄、熊谷貴美代、坂本祥一、茶谷聡

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\5150955 ( Direct Cost: \3962274 、 Indirect Cost:\1188681 )

  2. 硝酸アンモニウム含有粒子による新型越境汚染メカニズムの解明

    Grant number:20鉄基金C-34-12  2021.11 - 2022.10

    2021年度環境助成研究 

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\1500000

  3. 都市型PM2.5の高濃度化現象の原因解明と常時監視データ補正法

    2016.6 - 2019.3

    環境研究総合推進費 

    長田和雄

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    Grant type:Competitive

    本研究では、関東平野と濃尾平野において、湾岸部と内陸部などで時別の大気観測・サンプリングを行い、有機マーカー成分や指標元素濃度のデータを取得する。また、冬季都市域での硝酸アンモニウムの形成を調べるために、アンモニア等のガス濃度も測定する。これらの観測データにより、都市型PM2.5 高濃度現象の実態を把握し、発生源寄与割合の推計精度向上に必要な科学的知見の充実を目指す。さらに、光散乱式計測装置など非集積的な手法を用いて、湿度と粒子体積、主要化学成分との関係を把握することにより、常時監視局で測定されるPM2.5 濃度の1 時間値の解釈を補助する手法を検討する。本委託業務では、都市域でのPM2.5 生成の実態を把握するために、ガス状・粒子状のアンモニアと硝酸濃度を観測すると共に、時別・風向別の大気サンプリングを湾岸部と内陸部などでおこない、有機マーカー成分や指標元素の分析から、都市型PM2.5 高濃度イベントの発生要因解明に資するデータを得る。観測データとモデルシミュレーションから、高濃度イベントに寄与の大きな発生源の推定を目指す。さらに、湿度と化学成分データ、湿度別粒径分布データとを組み合わせて、PM2.5 濃度の 時間値の解釈を補助する手法を検討する。

  4. スス粒子の変質に関する研究:親水性の獲得と輸送距離との関係

    2007.12 - 2009.11

    鉄鋼業環境保全技術開発基金 

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    Grant type:Competitive

    スス粒子の変質について観測し、電子顕微鏡で解析する

KAKENHI (Grants-in-Aid for Scientific Research) 10

  1. 気体状・粒子状のアンモニア態・硝酸態窒素による越境汚染の動態解明

    2015.4 - 2018.3

    科学研究費補助金  基盤研究(B)

    長田和雄

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    Authorship:Principal investigator 

    大気中のアンモニア態窒素について、ガス・粒子濃度を高時間分解能で鳥取にて観測し、風向別に解析することで越境汚染の影響について知見を得る。

  2. Five-dimensional data assimilation of aerosol based on integrated analysis of multi-wavelength lidar and chemical transport model

    Grant number:25220101  2013.5 - 2018.3

    Uno Itsushi

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    Authorship:Coinvestigator(s) 

    Based on the multi-wave length Mie-Raman Lidar measurement at Fukuoka, Okinawa and Toyama, we examined the detailed retrieval algorithm of aerosol components (4 components). We clarified the retrieval problems based on the ground-truth aerosol observation at Fukuoka and made the retrieved 3D aerosol data set. Observation data were analyzed by chemical transport model including the detailed gas-aerosol chemical reactions. We developed the multi-aerosol components data assimilation system based on the Green-Function sensitives analysis. Developed data assimilation model was used to establish the aerosol concentration re-analysis data-base including the seasonal and spatial variations.

  3. 一粒の石英粒子のカソードルミネッセンス分析によるダスト供給源推定法の開発

    Grant number:24651020  2012.4 - 2013.3

    長島 佳菜

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    Authorship:Coinvestigator(s) 

    これまでのダスト供給源推定法は、分析に多くの量(数mg~数100mg)を必要とするため、極微量の風送ダスト試料に対して、用いることが出来なかった。そこで本研究は、カソードルミネッセンス(CL)分析を利用した、個別石英粒子の供給源推定法の確立を目的としている。
    タクラマカン砂漠、ゴビ砂漠、中国北部の砂漠(Mu Us, Hobq砂漠等)表層の砂泥試料、更にチベット北縁・Kunlun山脈のレス試料について、20μm以下の細粒の石英粒子(一部粗粒も含む)を選び、岡山理科大学でCL分析を行った。得られたCLは、石英粒子毎に差が大きいものの、砂漠毎に特徴的なスペクトル形を示した。そこでその特性を明らかにするため、得られたCLスペクトルをピークの中心位置(ev)や半値幅が既知である複数のピーク(正規分布)へ分離し、スペクトルを構成するピーク(それぞれ1つもしくは複数の石英の構造欠陥・不純物元素に対応)と強度のデータを抽出した。その結果、全てのCLスペクトルが6つのピークに分離されることが分かった。各ピークの相対強度は、大きな標準偏差を持つものの、砂漠による共通の特徴をいくつか示した。例えば、タクラマカン砂漠およびKunlun山脈の試料は、1.7 eV付近のピークの相対強度が高く、このピークを形成する石英中のFe3+中心の存在が、タクラマカン砂漠起源の石英を特徴づけている可能性が高い。一方、こうした結果を日本に運ばれるダストの供給源推定に応用するため、鳥取乾燥地研究センターと名古屋大学において、湿性/乾性沈着ダストの採取を行った。今後は、CLによる供給源推定の精度を上げ、得られた試料を用いて、CL分析による供給源推定と、衛星・地上気象観測データ、およびモデル実験から予測される供給源との比較を行い、手法の有用性の検証を進めたい。

  4. 越境汚染時における大気中アンモニア態窒素の存在状態と濃度

    2011.4 - 2013.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  5. 全球ダスト動態解明のための観測・解析・モデルインタラクション

    2008.4 - 2011.3

    科学研究費補助金  基盤研究(A)

    三上正男

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    Authorship:Coinvestigator(s) 

    ダスト沈着量の測定を分担

  6. エアロゾル粒子の変質が内部混合状態に及ぼす影響と氷晶化能力との関係       

    2008.3 - 2011.9

    科学研究費補助金  基盤研究(B)

    長田 和雄

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    Authorship:Principal investigator 

  7. Atmospheric deposition of particulate trace metals and organic carbon to the ocean and production processes of marine aerosols

    Grant number:18067005  2006 - 2010

    UEMATSU Mitsuo

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    Authorship:Coinvestigator(s) 

    Under the Western Pacific Air-Sea interaction Study (W-PASS), we developed new analytical methods, conducted shipboard measurements, and simulated global transport of terrestrial aerosols. Possible phytoplankton bloom over the sea caused by deposition of mineral particles contained iron was observed in the North Pacific. Most of nitrogen and carbon in marine aerosol over the western North Pacific existed as organic forms and clarified to be marine origin. Dust particles emitted from Asian deserts were found to travel more than 1.5 times around the globe.

  8. Linkages in biogeochemical cycles beween surface ocean and lower atmosphere

    2005.7 - 2011.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Priority Areas

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    Authorship:Coinvestigator(s) 

  9. 南極・昭和基地への対流圏物質輸送:中・低緯度の影響評価

    2003.7 - 2006.3

    科学研究費補助金  基盤研究(B)

    長田和雄(南極越冬のため松永捷司に交代)

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    Authorship:Principal investigator 

  10. 中部山岳地帯における夏季の山岳ポンプ効果に関する研究

    2001.7 - 2003.3

    科学研究費補助金  基盤研究(C)

    長田和雄

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    Authorship:Principal investigator 

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Teaching Experience (On-campus) 24

  1. Seminar on Biogeochemical Cycle 2E

    2021

  2. Seminar on Biogeochemical Cycle 1E

    2021

  3. Global and Urban Warmings

    2021

  4. Field Seminar on Environmental Studies

    2021

  5. Atmospheric Aerosol Sciences

    2021

  6. Earth Environmental Science

    2021

  7. Seminar on Biogeochemical Cycle 2F

    2021

  8. Seminar on Biogeochemical Cycle 2D

    2021

  9. Seminar on Biogeochemical Cycle 1D

    2021

  10. Seminar on Biogeochemical Cycle 1B

    2021

  11. 環境問題解決の最前線

    2021

  12. 物質循環科学セミナー2D

    2020

  13. 物質循環科学セミナー2C

    2020

  14. 物質循環科学セミナー2B

    2020

  15. 物質循環科学セミナー2A

    2020

  16. 物質循環科学セミナー1D

    2020

  17. 物質循環科学セミナー1C

    2020

  18. 物質循環科学セミナー1B

    2020

  19. 物質循環科学セミナー1A

    2020

  20. 環境学フィールドセミナー

    2020

  21. First Year Seminar A

    2011

  22. 大気エアロゾル科学

    2009

     詳細を見る

    大気エアロゾルについて基礎から専門的な事柄までを解説する

  23. 環境学フィールドセミナー

    2009

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    環境学研究科の体系理解科目の一つで、フィールドワークに基づいて、環境問題をとらえるセミナーである。

  24. 地球環境変動論

    2009

     詳細を見る

    環境学研究科の体系理解科目の一つで、地球環境の変動について解説する。

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Teaching Experience (Off-campus) 3

  1. 環境資源科学特別講義III

    2009.4 - 2010.3 東京農工大学)

  2. 環境資源科学特別講義III

    2008.4 - 2009.3 東京農工大学)

  3. エアロゾル気候学

    2005.4 - 2006.3 北海道大学)

 

Social Contribution 5

  1. 大気環境学会中部支部講演会

    Role(s):Presenter, Planner, Organizing member

    大気環境学会中部支部  大気環境学会中部支部講演会  名古屋大学・オンライン開催  2022.1

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    Audience: Scientific

    Type:Lecture

  2. 地球規模の環境汚染に関する科学と政策 第1回シンポジウム

    Role(s):Presenter, Planner, Organizing member

    大学院環境学研究科  船舶からの硫黄酸化物及び粒子状物質の排出規制: 地球規模での大気汚染対策の意義と影響  2021.11

  3. 南極OB会『東海支部の歴史を語る』

    Role(s):Lecturer

    南極OB会  第34回「南極の歴史」講話会  2021.9

  4. 名古屋の空気は綺麗になったのか?

    Role(s):Lecturer

    なごや環境大学共育講座  令和 3 年度前期 瑞穂生涯学習センター 公開講座  2021.9

  5. 大気環境学会中部支部講演会

    Role(s):Presenter, Planner, Organizing member

    大気環境学会中部支部  大気環境学会中部支部講演会  オンライン会議  2020.12

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    Audience: College students, Graduate students, Teachers, Researchesrs, General, Scientific, Governmental agency

    Type:Lecture

Media Coverage 2

  1. 冬の山、なぜはっきり見える? Newspaper, magazine

    毎日新聞社  毎日新聞  暮らしの中の科学  2024.2

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    Author:Other 

  2. エアロゾルペディアの作成と編集 Internet

    日本エアロゾル学会  https://sites.google.com/view/aerosolpedia/  https://sites.google.com/view/aerosolpedia/  2022.8

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    Author:Myself 

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