Abstract：In this study focusing on the air quality changes in January 2013, Fuzhou, the capital city of Fujian Province, we investigated the impacts of changes in atmospheric boundary layer and regional air pollutant transport on the atmospheric particulate matter PM2.5 in Fuzhou. By using the ground and radiosonde data operationally observed in Fuzhou and NCEP FNL analysis data of January 2013, the atmospheric boundary variations were characterized by the correlation analysis between atmospheric boundary layer elements and PM2.5 concentrations. By employing the HYSPLIT backward trajectory model and the correlation vector analysis, the regional pollutant transport to Fuzhou in January 2013 was explored. The results indicated that surface air temperature were positively correlated with the PM2.5 concentrations, while near-surface wind speeds were negatively correlated with PM2.5 concentrations, reflecting that favorable boundary layer conditions are conducive to the local formation and accumulation of haze pollutants. However, none of temperature inversion structures existed in the boundary layer during the high PM2.5 pollution in Fuzhou, differently from the typical temperature inversion layer for haze occurrences over the pollutant source regions in Eastern China. The non-inversion in vertical temperature structures in Fuzhou implied that Fuzhou haze events with the vertical mixing of air pollutants from upper layer to surface layer could be greatly contributed from the regional air pollutant transport, and Fuzhou was regarded as a receptor region of PM2.5 pollutants imported from its surrounding source regions. The HYSPLIT modeling and the correlation vector analysis confirmed that the clean days with low PM2.5 in January 2013 were accompanied with southeast winds from ocean to land; the PM2.5 levels for the haze pollution were enhanced by the transport in the northerly winds from the pollutant source region over the Yangtze River Delta region, northern Jiangsu and Anhui, Henan area. The regional transport pathways and source regions of PM2.5 for Fuzhou in January 2013 were identified.
蒋永成, 赵天良, 王宏, 王琼, 常炉予, 谭成好. 福州市PM2.5污染过程中大气边界层和区域传输研究[J]. 中国环境科学, 2015, 35(2): 347-355.
JIANG Yong-Cheng, ZHAO Tian-Liang, WANG Hong, WANG Qiong, CHANG Lu-Yu, TAN Cheng-Hao. Analysis on atmospheric boundary layer and regional transport during PM2.5 Pollution episodes in Fuzhou. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(2): 347-355.
