银川市空气质量超标的天气形势分析

THE WEATHER CHARACTER ANALYSIS OF THE AIR POLLUTION IN YINCHUAN

利用银川市环境监测站 5a的污染物浓度资料及对应的天气图 ,分析了银川市空气质量超标的特征和天气形势。结果表明 :银川市空气质量超标主要出现在冬半年 ,10月～ 1月SO2 超标多于TSP ,2月～ 6月TSP超标多于SO2 ;造成银川市空气质量超标的天气形势有西北气流型、冷空气穿脊东移型、冷槽东移型、纬向气流型、西南气流型五种。分析 2 0 0 2年 10月～ 2 0 0 2年 12月期间的天气形势 ,得出的SO2 、PM10 超标日 ,对比用CAPPS数值预报模式作出的SO2 、PM10 超标日 ,SO2 超的漏报率降低了 2 0 % ,PM10 超标的漏报率降低了 18%。

From analysis of the data of air contaminant density monitored by Yinchuan Enviromental Monitor Station during 5 years (1997～2002) and of the weather chart,the conclusion can be drawn that the serious air pollution mainly occurred in the winter days.The main contaminants are TSP and SO 2.From October to the next January,the situation that density of TSP exceeds the standard point happens more frequently than that of SO 2,while from the February to June,the opposite case is true.The main weather situations that influence the concentration of contaminants are mainly the following:the northwestward air current,the eastward cold air current traversing the air ridge,the eastward cold air trough,air current along the latitude and southeastward air current.The analysis of the weather situation between Oct,2001 and Dec,2002 and the result of CAPPS Numerical Prediction System show that,the possibility of failure to report density of SO 2 exceeing the standard point may reduce 20 %. As for as PM 10 is concerned,the reduction is 18 %.