Seasonal patterns of PM2.5 sources and chemical composition from different air mass directions in Tianjin
SHI Xu-rong, WEN Jie, TIAN Ying-ze, SHI Guo-liang, ZHANG Yu-fen, FENG Yin-chang
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
PM2.5 samples were collected simultaneously at an inland and coastal sites during four seasons in Tianjin, China. A three-way receptor model and HYSPLIT model were utilized to investigate the sources of PM2.5 at two sites, and qualitatively determine the major air mass origins, and then the source directional apportionment (SDA) was applied to quantify source contributions from different directions to the ambient PM2.5. The results showed that PM2.5 concentration from Bohai Sea direction was relatively low (97.1μg/m3), but the air masses percentage was high (23.7%). While PM2.5 concentration from Inner Mongolia direction was high compared with the Bohai direction,but the air masses percentage was low. In coastal site, the largest contributors to PM2.5 were crustal dust from SSW for spring (12.8%), sulfate and SOC (secondary organic carbon) from SE for summer (9.8%), coal combustion from WSW for autumn (10.3%), sulfate and SOC from WNW for winter (12.1%). For inland site, the largest contributors to PM2.5 during four seasons were crustal dust from SSW (14.5%), sulfate+SOC from S (south direction, 13.5%), vehicle exhaust form SSW(8.9%), sulfate and SOC from WNW respectively (9.5%).
史旭荣, 温杰, 田瑛泽, 史国良, 张裕芬, 冯银厂. 天津不同气团来向PM2.5中组分和污染源贡献的季节变化[J]. 中国环境科学, 2018, 38(7): 2406-2414.
SHI Xu-rong, WEN Jie, TIAN Ying-ze, SHI Guo-liang, ZHANG Yu-fen, FENG Yin-chang. Seasonal patterns of PM2.5 sources and chemical composition from different air mass directions in Tianjin. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(7): 2406-2414.
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