| Budget Amount *help |
¥218,270,000 (Direct Cost: ¥167,900,000、Indirect Cost: ¥50,370,000)
Fiscal Year 2016: ¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2015: ¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2014: ¥28,990,000 (Direct Cost: ¥22,300,000、Indirect Cost: ¥6,690,000)
Fiscal Year 2013: ¥75,920,000 (Direct Cost: ¥58,400,000、Indirect Cost: ¥17,520,000)
Fiscal Year 2012: ¥75,920,000 (Direct Cost: ¥58,400,000、Indirect Cost: ¥17,520,000)
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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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