Faculty Profiles - OSADA, Kazuo

Papers - OSADA, Kazuo

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Seasonal Variations of Peroxyacyl Nitrates and Organic Nitrate Concentrations at Suzu, the Noto Peninsula Open Access

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

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

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

Open Access

CiNii Research

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

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

Water soluble fraction of Asian dust particles Reviewed Open Access

K. Osada

Atmospheric Research Vol. 124 page： 101–108 2013.1

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

Hara K., Osada K., Yamanouchi T.

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

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

Vol. 118 page： 7606–7616 2013

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

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

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

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 Open Access

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

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

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

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 Open Access

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

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

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

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

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

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

Temporal and spatial variations of wet deposition flux of mineral dust in Japan Reviewed Open Access

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

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

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

AAQR Vol. 11 page： 170-178 2011.3

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

Atmospheric Radon Observation on the Antarctic Ocean Open Access

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

Vol. 58 ( 1 ) page： 31-38 2011.1

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

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

J. Geophys. Res. 2011

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

TAKAMI Akinori, OSADA Kazuo, SADANAGA Yasuhiro, BANDOW Hiroshi

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

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

Ammonia (NH3) 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 NH3 was 0.56±0.50 ppbv. It is considered that the variation in NH3 concentration does not come from the long range transport. The concentration and standard deviation (1σ) of ammonium ion (NH4+) measured using an aerosol mass spectrometer (Q-AMS, Aerodyne) was 2.2±1.4 µgm-3 and NH4+ was more than 80% for NH3+NH4+ when NH4+ was transported over long-range associated with sulfate (SO42-). NH4+ was deficient when SO42-/(SO2+SO42-) was large in air masses.

DOI： 10.11203/jar.26.42

Open Access

CiNii Research

Seasonal features of ultrafine particle volatility in the coastal Antarctic troposphere Open Access

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

Seasonal variations and vertical features of aerosol particles in the Antarctic troposphere Open Access

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

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

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Papers - OSADA, Kazuo