2009 Fiscal Year Final Research Report
Water-solubility of modified Kosa particles and the influences on light scattering and cloud formation
| Project/Area Number |
19510022
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Japan, Meteorological Research Institute |
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Principal Investigator |
ZAIZEN Yuji Japan, Meteorological Research Institute, 環境・応用気象研究部, 主任研究官 (70354496)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Hiroshi 気象庁気象研究所, 環境・応用気象研究部, 研究官 (80354497)
SAKAI Tetu 気象庁気象研究所, 気象衛星・観測システム研究部, 研究官 (00377988)
MINAMI Yukiya 石川県立大学, 生物資源環境学部・環境科学科, 准教授 (90290080)
OKADA Kikuo 気象庁気象研究所, 環境・応用気象研究部, 室長 (20111859)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 物質循環 / 黄砂 |
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| Research Abstract |
Kosa particles collected at Mt.Hodatu, Fukuoka etc. in spring during 2008-2009 were analyzed using electron microscopes (TEM and SEM). Number fraction of internally mixed Kosa particles were very variable (23.3-93.3%) among Kosa events. It was observed that internally mixed Kosa particles changed to droplets at high relative humidity. The dominant contributer of internal mixing was assumed to be air pollution. Experiments using artifitial Kosa particles suggested that calcium carbonate is less reactive with sulfur dioxide and the modification of Kosa is mainly caused by reaction with gaseous nitric acid. Measurements using an OPC and a lidar system suggested that the optical parameter of Kosa particles remarkably depend on the nonsphericalisity and that depolarization ratio of Kosa depends its size.
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[Journal Article] Temporal trends of non-sea salt sulfate and nitrate in wet deposition in Japan2007
Author(s)
Izumi Noguchi, Kentaro Hayashi, Masahide Aikawa, Tsuyoshi Ohizumi, Yukiya Minami, Moritsugu Kitamura, Akira Takahashi, Hiroshi Tanimoto, Kazuhide Matsuda, Hiroshi Hara
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Journal Title
Water, Air, and Soil pollution: focus vol.7
Pages: 67-75
Peer Reviewed
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