青岛一次沙尘污染事件的气象条件特征

Analysis of Meteorological Conditions About a Dust Pollution Event in Qingdao of Shandong Province

2008年5月28日至6月1日青岛市区出现了持续5 d的大气污染,其中29-30日为重度污染,其余3日为轻度污染。本文基于青岛常规地面和高空观测资料以及环境监测站SO2、NO2、PM10监测资料,利用资料分析和中尺度数值模拟的方法,分析造成青岛此次持续多日的大气污染的污染源、大气环流和气象要素特征。分析结果表明：此次污染过程主要是外来沙尘引起的PM10污染;持续较强的逆温层结以及近地面层弱南北风频繁交替出现造成沙尘在近地层往复、积聚,最终导致连续多日的空气污染。

There was a process of air pollution lasting for five days from May 28 th to June 1st,2008 in Qingdao including two heavy pollution days on 29 th and 30 th and three light air pollution days.The pollutant and characteristics of atmospheric circulation,meteorological elements were analyzed by using surface and upper air weather observations and environment monitoring data in the urban districts.The results show that the main pollutant of this air pollution event was PM10,which was caused by dust weather.The weak wind field and stronger inversion layer lasting were the main meteorological characteristics for this air pollution case.Under the situation of pollutant existing,weak wind near surface and inversion layer were not helpful for atmospheric horizontal and vertical diffusion,and the concentrate of PM10 tended to be higher with the increase of inversion intensity.Moreover,the frequent alternation of southerly and northerly surface wind led to dust transform and accumulation near surface again and again,so air pollution continued for days finally.