Updated on 2025/09/25

写真a

 
KAWAI Kei
 
Organization
Graduate School of Environmental Studies Department of Earth and Environmental Sciences Climate Science Designated Assistant Professor
Title
Designated Assistant Professor
External link

Degree 1

  1. Doctor of Science （ 2018.3   Nagoya University ） 

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Research Interests 4

  1. mineral dust

  2. ice nucleating particle

  3. global climate-aerosol model

  4. lidar

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Awards 1

  1. Yamamoto Award of the Meteorological Society of Japan

    2022.10   The Meteorological Society of Japan   Studies on ice nucleating particles of Asian dust and their impacts on clouds and radiation

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Papers 20

  1. Contributions of Dust Source Regions to Ice Nucleating Particles in Mixed-Phase Clouds Simulated with a Global Climate–Aerosol Model Reviewed Open Access

    Kei Kawai, Hitoshi Matsui

    Journal of Climate   Vol. 38   page： 4925 - 4939   2025.9

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Meteorological Society  

    Abstract

    Mineral dust is emitted from various arid regions of the world and plays an important role as ice nucleating particles (INPs) in aerosol–cloud interactions and their climate impacts. However, the estimation of the global distribution of dust INPs in mixed-phase clouds is highly uncertain, and their global source contributions have not been evaluated. Here, using a global climate–aerosol model that incorporates ice nucleation parameterizations of dust, we show that the spatial distribution and source contributions of dust INPs differ substantially from those of dust mass both globally and regionally because INP-to-mass ratios vary by an order of magnitude among source regions. For about 60% of Earth’s surface, the dominant source regions (source regions with the largest contribution) of dust mass and INPs are different, or even if the dominant source regions are the same, their contributions to total dust mass and INPs differ by more than 10%. In the midlatitude source regions of the Northern Hemisphere, the contribution of local dust (emitted within a target source region) to total dust INPs is small (21%–56%), suggesting the influence of nonlocal dust on the distributions and amounts of mixed-phase clouds and precipitation and the resulting local dust emission processes. Considering the different rates of increase in dust emissions from preindustrial times to the present among source regions, our results highlight the importance of accurately estimating the emission and transport of dust from each source region for a better understanding of aerosol–cloud interactions through dust ice nucleation and their long-term changes.

    DOI： 10.1175/jcli-d-24-0696.1

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    Other Link： https://journals.ametsoc.org/downloadpdf/journals/clim/38/18/JCLI-D-24-0696.1.xml

  2. Studies of atmospheric climate forcers in the Arctic during the ArCS II project Reviewed

    M. Koike, M. Takigawa, S. Morimoto, K. Adachi, T. Aizawa, N. Chandra, R. Fujita, D. Goto, S. Ishidoya, K. Ishijima, A. Ito, K. Kawai, Y. Kanaya, Y. Kim, T. Kinase, Y. Kondo, T. Machida, H. Matsui, T. Miyakawa, M. Mochida, T. Mori, N. Moteki, S. Murayama, S. Ohata, N. Oshima, P.K. Patra, F. Taketani, Y. Tobo, Y. Tohjima, S. Toyoda, K. Tsuboi, O.C. Rui, K. Yahara, K. Yamaji, A. Yoshida, C. Zhu

    Polar Science     2025.6

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.polar.2025.101216

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  3. Increasing Arctic dust suppresses the reduction of ice nucleation in the Arctic lower troposphere by warming Reviewed Open Access

    Hitoshi Matsui, Kei Kawai, Yutaka Tobo, Yoshinori Iizuka, Sumito Matoba

    npj Climate and Atmospheric Science   Vol. 7   page： 266   2024.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1038/s41612-024-00811-1

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    Other Link： https://www.nature.com/articles/s41612-024-00811-1

  4. Surface warming in Svalbard may have led to increases in highly active ice-nucleating particles Reviewed Open Access

    Yutaka Tobo, Kouji Adachi, Kei Kawai, Hitoshi Matsui, Sho Ohata, Naga Oshima, Yutaka Kondo, Ove Hermansen, Masaki Uchida, Jun Inoue, Makoto Koike

    Communications Earth & Environment   Vol. 5   page： 516   2024.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    The roles of Arctic aerosols as ice-nucleating particles remain poorly understood, even though their effects on cloud microphysics are crucial for assessing the climate sensitivity of Arctic mixed-phase clouds and predicting their response to Arctic warming. Here we present a full-year record of ice-nucleating particle concentrations over Svalbard, where surface warming has been anomalously faster than the Arctic average. While the variation of ice-nucleating particles active at around −30 °C was relatively small, those active at higher temperatures (i.e., highly active ice-nucleating particles) tended to increase exponentially with rising surface air temperatures when the surface air temperatures rose above 0 °C and snow/ice-free barren and vegetated areas appeared in Svalbard. The aerosol population relevant to their increase was largely characterized by dust and biological organic materials that likely originated from local/regional terrestrial sources. Our results suggest that highly active ice-nucleating particles could be actively released from Arctic natural sources in response to surface warming.

    DOI： 10.1038/s43247-024-01677-0

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    Other Link： https://www.nature.com/articles/s43247-024-01677-0

  5. Mass-Extinction Conversion Factor (MECF) over the Gobi Desert by a Tethered-balloon-based OPC and a Ceilometer Reviewed Open Access

    Kenji Kai, Kei Kawai, Kazuma Ohara, Yuki Minamoto, Yoshitaka Jin, Teruya Maki, Jun Noda, Tatsuo Shiina, Enkhbaatar Davaanyam

    SOLA   Vol. 19   page： 269 - 273   2023.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Meteorological Society of Japan  

    DOI： 10.2151/sola.2023-035

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  6. Dominant role of Arctic dust with high ice nucleating ability in the Arctic lower troposphere Reviewed Open Access

    Kei Kawai, Hitoshi Matsui, Yutaka Tobo

    Geophysical Research Letters   Vol. 50   page： e2022GL102470   2023.4

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

    DOI： 10.1029/2022GL102470

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  7. High sensitivity of Asian dust emission, transport, and climate impacts to threshold friction velocity Reviewed Open Access

    Kei Kawai, Hitoshi Matsui, Reiji Kimura, Masato Shinoda

    SOLA   Vol. 17   page： 239 - 245   2021.12

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

    DOI： 10.2151/sola.2021-042

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  8. High potential of Asian dust to act as ice nucleating particles in mixed-phase clouds simulated with a global aerosol-climate model Reviewed International journal Open Access

    Kei Kawai, Hitoshi Matsui, Yutaka Tobo

    Journal of Geophysical Research: Atmospheres   Vol. 126   page： e2020JD034263   2021.6

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

    DOI： 10.1029/2020JD034263

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  9. Dust hotspot in the Gobi Desert: A field survey in April 2019 Reviewed International coauthorship Open Access

    Kenji Kai, Kei Kawai, Atsuya Ito, Yuki Aizawa, Yuki Minamoto, Erdenebadrakh Munkhjargal, Enkhbaatar Davaanyam

    SOLA   Vol. 17   page： 130 - 133   2021.6

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

    DOI： 10.2151/sola.2021-023

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  10. Vertical distributions of airborne microorganisms over Asian dust source region of Taklimakan and Gobi Desert Reviewed International coauthorship International journal

    Teruya Maki, Chen Bin, Kenji Kai, Kei Kawai, Kazuyuki Fujita, Kazuma Ohara, Fumihisa Kobayashi, Enkhbaatar Davaanyam, Jun Noda, Yuki Minamoto, Guangyu Shi, Hiroshi Hasegawa, Yasunobu Iwasaka

    Atmospheric Environment   Vol. 214   page： 116848-1 - 116848-8   2019.7

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

    DOI： 10.1016/j.atmosenv.2019.116848

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  11. Aeolian dispersal of bacteria associated with desert dust and anthropogenic particles over continental and oceanic surfaces Reviewed International coauthorship International journal Open Access

    Teruya Maki, Kevin C. Lee, Kei Kawai, Kazunari Onishi, Chun Sang Hong, Yasunori Kurosaki, Masato Shinoda, Kenji Kai, Yasunobu Iwasaka, Stephen D. J. Archer, Donnabella C. Lacap-Bugler, Hiroshi Hasegawa, Stephen B. Pointing

    Journal of Geophysical Research: Atmospheres   Vol. 124 ( 10 ) page： 5579 - 5588   2019.4

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

    DOI： 10.1029/2018JD029597

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  12. Northeast Asian dust transport: A case study of a dust storm event from 28 March to 2 April 2012 Reviewed International coauthorship International journal Open Access

    Purevsuren Tsedendamba, Jugder Dulam, Kenji Baba, Katsuro Hagiwara, Jun Noda, Kei Kawai, Ganzorig Sumiya, Christopher McCarthy, Kenji Kai, Buho Hoshino

    Atmosphere   Vol. 10 ( 2 ) page： 69-1 - 69-16   2019.2

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

    DOI： 10.3390/atmos10020069

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  13. Ceilometer observation of a dust event in the Gobi Desert on 29–30 April 2015: Sudden arrival of a developed dust storm and trapping of dust within an inversion layer Reviewed International coauthorship International journal Open Access

    Kei Kawai, Yuta Nishio, Kenji Kai, Jun Noda, Erdenebadrakh Munkhjargal, Masato Shinoda, Nobuo Sugimoto, Atsushi Shimizu, Enkhbaatar Davaanyam, Dashdondog Batdorj

    SOLA   Vol. 15   page： 52 - 56   2019.2

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

    DOI： 10.2151/sola.2019-011

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  14. Vertical profiles of wind hodographs in the summer land-sea breeze observed at the Port of Nagoya Reviewed Open Access

    Ippei Nagao, Yuki Kikumoto, Kei Kawai, Kazuo Osada, Takashi Shibata, Kenji Kai

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

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本気象学会  

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  15. Evaluation of ceilometer attenuated backscattering coefficients for aerosol profile measurement Reviewed International coauthorship International journal Open Access

    Yoshitaka Jin, Nobuo Sugimoto, Atsushi Shimizu, Tomoaki Nishizawa, Kenji Kai, Kei Kawai, Akihiro Yamazaki, Motoki Sakurai, Holger Wille

    Journal of Applied Remote Sensing   Vol. 12 ( 4 ) page： 042604-1 - 042604-12   2018.7

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

    DOI： 10.1117/1.JRS.12.042604

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  16. Lidar network observation of dust layer development over the Gobi Desert in association with a cold frontal system on 22–23 May 2013 Reviewed International coauthorship International journal Open Access

    Kei Kawai, Kenji Kai, Yoshitaka Jin, Nobuo Sugimoto, Dashdondog Batdorj

    Journal of the Meteorological Society of Japan   Vol. 96 ( 3 ) page： 255 - 268   2018.6

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Meteorological Society of Japan  

    DOI： 10.2151/jmsj.2018-023

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  17. Large-scale dust event in East Asia in May 2017: Dust emission and transport from multiple source regions Reviewed International coauthorship International journal Open Access

    Yuki Minamoto, Kotaro Nakamura, Minrui Wang, Kei Kawai, Kazuma Ohara, Jun Noda, Enkhbaatar Davaanyam, Nobuo Sugimoto, Kenji Kai

    SOLA   Vol. 14   page： 33 - 38   2018.3

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Meteorological Society of Japan  

    DOI： 10.2151/sola.2018-006

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  18. Variations in airborne bacterial communities at high altitudes over the Noto Peninsula (Japan) in response to Asian dust events Reviewed International coauthorship International journal Open Access

    Teruya Maki, Kazutaka Hara, Ayumu Iwata, Kevin C. Lee, Kei Kawai, Kenji Kai, Fumihisa Kobayashi, Stephen B. Pointing, Stephen Archer, Hiroshi Hasegawa, Yasunobu Iwasaka

    Atmospheric Chemistry and Physics   Vol. 17 ( 19 ) page： 11877 - 11897   2017.10

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

    DOI： 10.5194/acp-17-11877-2017

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  19. Dust event in the Gobi Desert on 22–23 May 2013: Transport of dust from the atmospheric boundary layer to the free troposphere by a cold front Reviewed International coauthorship International journal Open Access

    Kei Kawai, Kenji Kai, Yoshitaka Jin, Nobuo Sugimoto, Dashdondog Batdorj

    SOLA   Vol. 11   page： 156 - 159   2015.12

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Meteorological Society of Japan  

    DOI： 10.2151/sola.2015-035

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  20. Ceilometer calibration for retrieval of aerosol optical properties Reviewed International coauthorship International journal

    Yoshitaka Jin, Kenji Kai, Kei Kawai, Tomohiro Nagai, Tetsu Sakai, Akihiro Yamazaki, Akihiro Uchiyama, Dashdondog Batdorj, Nobuo Sugimoto, Tomoaki Nishizawa

    Journal of Quantitative Spectroscopy and Radiative Transfer   Vol. 153   page： 49 - 56   2015.3

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

    DOI： 10.1016/j.jqsrt.2014.10.009

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