干旱区研究2011，Vol.28Issue(4)：717-723,7.
乌鲁木齐冬季大气边界层结构特征及其对大气污染的影响
Analysis on Atmospheric Boundary Layer Structure and Its Effect on Air Pollution over Urumqi City in Winter
摘要
Abstract
Effect of meteorological conditions of atmospheric boundary layer on air pollutant dispersion is significant,but there have been few studies on atmospheric boundary layer characteristics over Urumqi yet.During December 11-20,2005,the sounding experiment in urban atmospheric boundary layer over Urumqi City was performed six times a day.Atmospheric boundary layer conditions,such as wind,temperature,mixing layer depth and temperature inversion,were analyzed.The results show that wind speed near ground surface was often lower than 3 m/s,and it was increased gradually with the increase of height below 600 m.The temperature inversion of ground-based and low level-elevated was higher than 1 ℃/100 m,and the daily mean mixing layer depth was 274 m.The meteorological conditions in two durations of air pollution at severe and light levels were compared.Wind speed was lower and temperature was higher during severe air pollution than that during light air pollution.In addition,the temperature inversion intensity during light air pollution was very high（4.5 ℃/100 m）,but its inversion depth was low（166 m）.The results reveal that the severe air pollution in Urumqi was mainly caused by the simultaneous decrease of wind speed in atmospheric boundary layer,labilization of the prevailing wind direction near ground surface,continuous surface temperature increase,and formation of unstable stratification below exhaustsmoke height of chimneys.The formation and stable continuance of the thick temperature inversion resulted in a long duration of severe air pollution.关键词
冬季/大气边界层/大气污染/气象条件/乌鲁木齐Key words
winter/atmospheric boundary layer/air pollution/meteorological conditions/Urumqi分类
资源环境引用本文复制引用
杨静,武疆艳,李霞,彭成海,王中伟..乌鲁木齐冬季大气边界层结构特征及其对大气污染的影响[J].干旱区研究,2011,28(4):717-723,7.基金项目
中央级公益性科研院所基本科研业务费专项资金项目(IDM2008003) （IDM2008003）
新疆气象局气象科技研究课题(C2008001) （C2008001）
环保公益性行业科研专项(200909007)共同资助 （200909007）
