福州天气形势分型与大气污染物相关分析

利用2002-2006年地面天气图和500hPa高空图，将影响福州的天气形势分为10型，结合大气污染物浓度资料，统计2002-2006年福州全年、冬半年和夏半年不同天气形势型的出现率及相应的污染物浓度值，分析不同天气形势下大气扩散能力的强弱以及对污染物浓度的影响。结果表明：锋前暖区和地面倒槽是最不利于扩散的天气型，台风（热带辐合带）和低涡锋面是最有利于扩散的天气型；冬半年高压后部、锋前暖区和地面倒槽对污染物浓度增大的影响最大，低涡锋面、高压脊和高压底部对污染物浓度减小的影响最大；夏半年台风（热带辐合带）及外围、低涡锋面、副热带高压对污染物浓度减小的影响最大，其他天气型影响下污染物浓度变化幅度均为正值。

Weather situation classification and its correlation with atmospheric pollutant in Fuzhou,Fujian province

Based on the ground synoptic chart and the upper-air chart of 500 hPa from 2002 to 2006, the weather situation types controlling Fuzhou weather were divided into 10 types. The frequencies of different weather situation types in the whole year, winter half year and summer half year and the corresponding pollutant concentrations were analyzed in Fuzhou. The atmospheric diffusion abilities under the different weather situations and their effects on pollutant concentrations were discussed. The results indicate that the warm sector ahead of the fronts and the ground inverse trough are the disadvantages to the atmospheric diffusion. However, typhoon （ Inter-Tropical Convergent Zone, ITCA） and low vortex front are advantageous to the atmospheric diffusion. During winter half year, the effects of the back of high pressure and the warm sector ahead of fronts as well as ground inverse trough on increasing pollutant concentrations are larger, while the effects of low vortex front and high pressure ridge as well as the base of high pressure on decreasing pollutant concentrations are larger. During summer half year, the effects of typhoon （ITCA） and low vortex front as well as subtropical high pressure on decreasing pollutant concentrations are larger, and the pollutant concentrations take on the positive values under other weather types.