Influence of Synoptic Systems on the Distribution and Evolution Process of PM10 Concentration in the Boundary Layer in Summer and Autumn
夏秋季节天气系统对边界层内大气中PM10浓度分布和演变过程的影响

The pressure field in the boundary layer affect regional atmospheric environmental quality directly,the changes of synoptic systems are related to the pressure field in the boundary layer.Based on the daily mean and increment figures of atmospheric environmental monitoring data during 2000-2006,the subtropical high and the typhoon are analyzed,which are important synoptic patterns in summer and autumn,results show that the temporal and spatial evolutions of these systems have important influence on the environmental qualities in China because high pressures and transports of wind field lead to pollutant accumulating.Moreover,rain can clear the atmosphere pollutant.The periodic evolvements of synoptic systems form the regional characteristic and periodic evolvements of atmospheric environment.Typical examples are chosen and analyzed in this paper.In the region of isohypse 5880 gpm at 500 hPa and high pressure at the sea surface,there are large-scale stable and regional pollution processes.PM10 concentration is low in the marginal area of subtropical high.PM10 concentration is high in the near and far influenced areas of typhoon.