乌鲁木齐市降水对大气污染的影响

Effects of Precipitation on Air Pollution in Urumqi City

根据2002—2003年乌鲁木齐市SO2、NO2、PM10的日平均浓度和日降水量分析了乌鲁木齐市降水对3种大气污染物的湿清除能力。分析表明大雨对SO2和PM10的湿清除能力大于小雨,而小雨大于中雨。中雪对SO2和PM10的湿清除能力大于大雪,而大雪大于小雪。小量以上降水(降雨和降雪)对NO2的湿清除能力基本相当。微雨对3种大气污染物具有湿清除能力,而微雪使3种大气污染物的浓度增加。

In this paper, the wet-eliminating capability of precipitation to three kinds of air pollutants in Urumqi is analyzed based on the daily average concentrations of SO2,NO2 and PM10 as well as the daily precipitation in Urumqi. The results show that the wet-eliminating capability of heavy rainfall to SO2 and PM10 is higher than that of slight rainfall, and that of slight rainfall is higher than that of moderate rainfall. The wet-eliminating capability of moderate snowfall to SO2 and PM10 is higher than that of heavy snowfall, and that of heavy snowfall is higher than that of light snowfall. The wet-eliminating capabilities of precipitation over small amount to NO2 are basically similar. Micro-rainfall has the wet-eliminating capability to these three kinds of air pollutants, however, the micro-snowfall results in an increase in concentrations of these three kinds of air pollutants.