2017 Fiscal Year Final Research Report
Composition, origin, transformation and hygroscopic properties of organic aerosols in East Asia and the North Pacific
| Project/Area Number |
24221001
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Chubu University (2015-2017)
Hokkaido University (2012-2014) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
関 宰 北海道大学, 低温科学研究所, 准教授 (30374648)
内田 昌男 国立研究開発法人国立環境研究所, 環境計測研究センター, 主任研究員 (50344289)
宮崎 雄三 北海道大学, 低温科学研究所, 助教 (60376655)
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| Project Period (FY) |
2012-05-31 – 2017-03-31
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| Keywords | 大気微粒子 / 有機エアロゾル / 東アジア / 北太平洋 / 化学組成 / 長期変動 / 吸湿特性 / 硫酸塩 |
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| Outline of Final Research Achievements |
In this project, we studied chemical compositions of atmospheric aerosols from East Asia and its outflow regions in the western North Pacific at levels of carbon, nitrogen, organic molecules including carboxylic acids, isotopes and inorganic ions. We found a decline of sulfate concentrations after 2006 due to the sulfur emission control in China, but organic aerosols showed a continuous increase from 2001 to 2013. This increase of organics is largely involved with the emissions of biomass burning of agriculture wastes such as wheat straw in China and other Asian countries. Those trends are consistent with an increase in the biomass-burning tracers such as levoglucosan in the marine aerosols.
Hygroscopic properties of aerosol particles were measured for remote marine aerosols. We found that growth factors of marine aerosols are decreased when Asian dusts (Kosa) are transported over the ocean due to the formation of water-insoluble calcium oxalate in spring.
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| Free Research Field |
地球化学・大気化学
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