2006 Fiscal Year Final Research Report Summary
Comparative studies on organic chemical composition of atmospheric aerosols from Chinese 14 cities, Jeju Island and Chichi-Jima Island and their hygroscopic properties
| Project/Area Number |
17340166
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
KAWAMURA Kimitaka Hokkaido University, Inst. Low Tem. Science, Professor (70201449)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Chinese-megacities / Chinese aerosols / Dicarboxylic acids / Levoglucosan / Normal alkanes / Photochemistry / Biomass burning / Fossil fuel combustion |
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| Research Abstract |
Nation-wide studies of organic aerosols were conducted on a molecular level in 15 Chinese cities. The results showed strikingly high levels of organic compounds (e.g., annual concentrations of polycyclic aromatic hydrocarbons, phthalates, sugars and diacids are 110, 370, 400 and 830 ng m^3, respectively), especially in the midwest region during winter (up to 125 mg m^3 organic carbon). Fossil fuel combustion and/or biomass burning products are 3-30 times more abundant in winter than in summer. In contrast, significant quantity of phthalates (168-2200 ng m^3) was detected in summer. Concentrations of the pollutants are generally 1-3 orders of magnitude higher than those in developed countries. Their source strengths are characterized in winter by fossil fuel combustion, followed by secondary oxidation, plant wax emissions and biomass burning, whereas in summer they are characterized by secondary oxidation, followed by fossil fuel combustion and plastic emissions.
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Research Products
(4 results)
