南京地区大气冰核浓度的测量及分析

he observation data of Ice Nuclei(IN) in Nanjing which was observed by the mixing cloud chamber and static diffusion cloud chamber was analyzed from May to August in 2011 to research the characterization of different ice nuclei concentrations. The results show that: during the observation period, the mean concentration of total ice nuclei is 21.949 L-1, the concentration of IN under supersaturation with respect to water and ice equals 5% is 0.928 L-1 and 0.291 L-1, respectively. The IN under favorite conditions has a diurnal variation. The concentration of IN in daytime is larger than at night and reaches the maximum in the afternoon which indicates that atmospheric IN is significantly influenced by human activities and industrial pollution. The removal of precipitation on IN is obviously, and the concentration of IN increases during the typhoon system. IN in Nanjing aera increases exponentially with decreasing temperature and total IN concentration is 1 L-1 at -15℃. The concentration of IN increases with humidity. The back trajectory model shows that the air mass from southwest increases low temperature IN(-25oC) obviously while local air mass and marine air mass increase high temperature IN(-10 and -15oC) significantly. In local air mass, the concentration of IN is less than that of marine. The more fire point, PM1 and ice nuclei on July 29 indicates that the combustion product maybe increase the ice nuclei concentration.