Aircraft Measurement of Organic Aerosols over China
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- 作者：Gehui Wang ; Kimitaka Kawamura ; Shiro Hatakeyama ; Akinori Takami ; Hong Li ; Wei Wang
- 刊名：Environmental Science & Technology
- 出版年：2007
- 出版时间：May 1, 2007
- 年：2007
- 卷：41
- 期：9
- 页码：3115 - 3120
- 全文大小：571K
- 年卷期：v.41,no.9(May 1, 2007)
- ISSN：1520-5851
文摘
Lower to middle (0.5-3.0 km altitude) troposphericaerosols (PM2.5) collected by aircraft over inland and eastcoastal China were, for the first time, characterized fororganic molecular compositions to understand anthropogenic,natural, and photochemical contribution to the air quality.n-Alkanes, fatty acids, sugars, polyacids are detectedas major compound classes, whereas lignin and resinproducts, sterols, polycyclic aromatic hydrocarbons, andphthalic acids are minor species. Average concentrationsof all the identified compounds excluding malic acidcorrespond to 40-50% of those reported on the groundsites. Relative abundances of secondary organic aerosol(SOA) components such as malic acid are much higher inthe aircraft samples, suggesting an enhanced photochemicalproduction over China. Organic carbon (OC) concentrationsin summer (average, 24.3 
g m-3) were equivalent tothose reported on the ground sites. Higher OC/EC (elementalcarbon) ratios in the summer aircraft samples alsosupport a significant production of SOA over China. Highloadings of organic aerosols in the Chinese troposphere maybe responsible to an intercontinental transport of thepollutants and potential impact on the regional and globalclimate changes.
g m-3) were equivalent tothose reported on the ground sites. Higher OC/EC (elementalcarbon) ratios in the summer aircraft samples alsosupport a significant production of SOA over China. Highloadings of organic aerosols in the Chinese troposphere maybe responsible to an intercontinental transport of thepollutants and potential impact on the regional and globalclimate changes.