Organic acids (including monocarboxylic acids, dicarboxylic acids, and aromatic acids) in atmospheric aerosols have received widespread attention because of their potential for global climate impact. These acids can reduce the surface tension of particulate matter, affect the generation of cloud condensation nodules, and participate in atmospheric chemical reactions that occur in the gas, liquid, and particulate states. Affected by urbanization and industrialization, the air pollution in the Pearl River Delta region is becoming more and more serious, and the Yangtze River Delta, Beijing, Tianjin, Tangshan and Chongqing have become the four regions with the most severe smog in China.
Researcher He Jianhui of the Institute of Earth Environment of the Chinese Academy of Sciences and his research team collected PM2.5 samples from winter and summer at four sampling points in Guangzhou, Zhaoqing, Hong Kong Polytechnic University and Hezui, Hong Kong. And seasonal changes, explored their role in source and photochemical reactions. The study found that in the Pearl River Delta, the total amount of water-soluble organic matter is higher in winter than in summer, but the average proportion of water-soluble organic carbon in organic carbon is higher in summer than in winter. The spatial and temporal distribution of water-soluble dicarboxylic acids is characterized by higher concentrations in Hong Kong in winter, lower concentrations in Guangzhou / Zhaoqing, and vice versa in summer. The characteristics of spatio-temporal distribution and seasonal variation are consistent with the photochemical conversion and subsequent accumulation under different meteorological conditions.
Related papers have been published in the internationally renowned academic journal Atmospheric Chemistry and Physics.
Paper information: KF Ho et al., Summer and winter variations of dicarboxylic acids, fatty acids and benzoic acid in PM2.5 in Pearl Delta River Region, China, Atmospheric Chemistry and Physics 11 (2011) 2197-2208.
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