Black carbon （BC） aerosol mass carried by winds of varying directions from non-local sources was esti- mated based on hourly measured data of BC mass concentration （CBc） and meteorological parameters from January ...Black carbon （BC） aerosol mass carried by winds of varying directions from non-local sources was esti- mated based on hourly measured data of BC mass concentration （CBc） and meteorological parameters from January 2008 to December 2012 in Shanghai, and the relationship between annual average CBc and wind speed was analyzed. The results show that the annual average CBC decreased with wind speed for speeds exceeding 0.3 m/s. The relationship between the two was determined by a linear fit with corre- lation coefficient 0,88. Assuming BC aerosol mass of non-local sources transported by a southeast wind was zero, annual average BC concentrations （μg/m3） carried by winds of variable direction were 1.99 （southwest）, 1.95 （west）, 1.15 （northwest）, 0.54 （south）, 0.39 （north）, 0.01 （northeast）, and 0.01 （east）. BC aerosol mass of non-local sources transported by wind to Shanghai was about 6404.05 t per year, among which the total contribution of southwest, west, and northwest winds was nearly 84~;. The aerosol mass transported to Shanghai in winter accounted for 35% that of the entire year, and was greater than that of the other seasons.展开更多
基金supported by the National Natural Science Foundation of China(No.41275157)Chinese Universities Scientific Fund(CUSF-DH-D-2014048)
文摘Black carbon （BC） aerosol mass carried by winds of varying directions from non-local sources was esti- mated based on hourly measured data of BC mass concentration （CBc） and meteorological parameters from January 2008 to December 2012 in Shanghai, and the relationship between annual average CBc and wind speed was analyzed. The results show that the annual average CBC decreased with wind speed for speeds exceeding 0.3 m/s. The relationship between the two was determined by a linear fit with corre- lation coefficient 0,88. Assuming BC aerosol mass of non-local sources transported by a southeast wind was zero, annual average BC concentrations （μg/m3） carried by winds of variable direction were 1.99 （southwest）, 1.95 （west）, 1.15 （northwest）, 0.54 （south）, 0.39 （north）, 0.01 （northeast）, and 0.01 （east）. BC aerosol mass of non-local sources transported by wind to Shanghai was about 6404.05 t per year, among which the total contribution of southwest, west, and northwest winds was nearly 84~;. The aerosol mass transported to Shanghai in winter accounted for 35% that of the entire year, and was greater than that of the other seasons.
