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Identification, abundance and seasonal variation of anthropogenic organic aerosols from a mega-city in China

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Title: Identification, abundance and seasonal variation of anthropogenic organic aerosols from a mega-city in China
Authors: Wang, Gehui Browse this author
Kawamura, Kimitaka Browse this author
Zhao, Xin Browse this author
Li, Qiuge Browse this author
Dai, Zhaoxia Browse this author
Niu, Hongyun Browse this author
Keywords: Organic aerosols
Hydroxylated PAHs
Source reconciliation
Issue Date: Jan-2007
Publisher: Elsevier Ltd
Journal Title: Atmospheric Environment
Volume: 41
Issue: 2
Start Page: 407
End Page: 416
Publisher DOI: 10.1016/j.atmosenv.2006.07.033
Abstract: PM2.5 aerosols were collected in Nanjing, a typical mega-city in China, during summer and winter 2004 and were characterized for aromatic and cyclic compounds using a GC/MS technique to understand the air pollution problem. They include polycyclic aromatic hydrocarbons (PAHs), hopanes, phthalates and hydroxy-PAHs (OH-PAHs). PAHs, hopanes and OH-PAHs presented higher concentrations in winter (26–178, 3.0–18, and 0.013–0.421 ng m−3, respectively) than in summer (12–96, 1.6–11, and 0.029–0.171 ng m−3, respectively) due to an enhanced coal burning for house heating and atmospheric inversion layers developed in the cold season. In contrast, phthalates are more abundant in summer (109–368 ng m−3, average 230 ng m−3) than in winter (33–390 ng m−3, average 170 ng m−3) due to an enhanced evaporation from plastics during the hot season and the subsequent deposition on the pre-existing particles. Generally, all the identified compounds showed higher concentrations in nighttime than in daytime due to inversion layers and increased emissions from heavy-duty trucks at night. PAHs, hopanes and phthalates in Nanjing aerosols are 5–100 times more abundant than those in Los Angeles, USA, indicating a serious air pollution problem in the city. Concentrations of OH-PAHs are 1–3 orders of magnitude less than their parent PAHs and comparable to those reported from other international cities. Source identification using diagnostic ratios of the organic tracers suggests that PAHs in Nanjing urban area are mainly derived from coal burning, whereas hopanes are more attributable to traffic emissions.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河村 公隆

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