The distribution characteristics of aerosol and CCN over the Bohai-sea gulf area, China

Abstract

In this research, based on the data of one time by the PCASP-100X probe of aircraft PMS and CCN counter detected under clear sky weather condition in summer over the Bohai-sea gulf area of north China at June 21, 2005, the distribution character of aerosols and CCN is primarily analyzed under different geography environment conditions over Bohai sea gulf area. The result shows that the aerosol concentration is 103 cm−3 in city boundary layer, upper troposphere is less than 103 cm−3, usually, and aerosol concentration value is decrease with height. Upper 600 meters level over the offing, the horizontal distribution of aerosol concentration value is relatively uniformity, it is generally 2000 to 6000 cm−3, which is less than one order of magnitude corresponding over the city and terrene height level, the result indicates that there is a significant different on distribution character of aerosols between the over city and Bohai-sea gulf area. At the same time, comparatively, the CCN counter detected result shows that CCN and aerosol concentration variety trend is similar with height over the city and sea area, which is exponential law. But, in atmospheric boundary, CCN and aerosol concentration value less than 1 to 5 times over offing area with over city area relatively. Otherwise, the researched result primarily suggests that weather conditions play an important rule for aerosol particle transportation in horizontal and vertical direction in atmospheric boundary layer.