关键词: 沙尘, 逆温层结, 弱风, 辐合带

Abstract:

 There was a process of air pollution lasting for five days from May 28th to June 1st， 2008 in Qingdao including two heavy pollution days on 29th and 30th 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．

Key words: dust, inversion layer, weak wind, convergence zone