石家庄大气污染与沙尘天气的关系分析

利用2002—2006年石家庄市逐时气象资料和环境监测资料,分析了8次典型沙尘天气对空气污染的影响。结果表明:沙尘天气的首要污染物均是可吸入颗粒物,春季中度以上污染日平均出现在沙尘日当日或次日;造成石家庄沙尘天气污染源分外来型、本地型以及二者共同影响型3种;其中,本地型沙尘污染多受冷锋影响,PM10浓度与风速呈正相关。而外来型污染多处于弱气压场控制,PM10浓度与南风呈反相关,而当风向转偏北时则利于污染物积累。

Relationship between atmospheric pollution and sandy weather in Shijiazhuang

Based on hourly meteorological and environmental monitoring data from 2002 to 2006 in shijiazhuang,the effects of sandy weather on air pollution were analyzed with 8 typical cases of sandy weather.The results showed that the main pollutant in sandy weather was PM210.Both the middle extent pollution days and the more serious pollution days happened in the day or next day of sandy weather.Pollution sources causing sandy weather could be divided into three types,i.e.outside pollution type,local pollution type and mixed pollution type.Of all,the local pollution type was mainly influenced by the cold front.And there was a positive correlation between PM10 concentration and wind speed.While the outside pollution type was often controlled by weak pressure filed,and PM10 concentration had a negative correlation with the south wind.When the wind veered to the north,it was favorable to pollutant accumulation.