成都地区大气边界层逆温特征分析

Characteristics of temperature inversion in atmospheric boundary layer in Chengdu area

针对污染气象条件对大气环境影响的问题,利用2010—2012年成都地区探空资料的温度数据,系统研究了成都地区逆温的结构及分布特征。结果表明:2010—2012年成都地区整体以贴地逆温出现频率最高、厚度最大及强度最强,其次为低悬逆温和高悬逆温。不同类型逆温出现的频率、厚度及强度也存在一定的季节差异,贴地逆温春季出现频率最高,厚度最大,其他各季差异不显著;冬季逆温最强,夏季最弱。3类逆温的日变化明显,08时逆温出现的频率和厚度普遍大于20时,且08时逆温强度大于20时。分析成都地区大气边界层逆温层特征,对了解成都地区污染物扩散规律具有重要的意义。

For the problem of the pollution meteorological conditions influencing atmospheric environment,struc-ture distribution characteristics of temperature inversion in Chengdu were analyzed based on temperature of sound-ing data from 2010 to 2012.The results show that surface inversion during 2010-2012 in Chengdu area as a whole has the highest frequency,the largest thickness and the strongest intensity,and then low-hung temperature inversion and high-hung temperature inversion follow.Frequency,thickness and intensity of temperature inversion of differ-ent types have a certain seasonal difference.For surface inversion,its frequency and thickness is the largest in spring and there is no significant difference in other seasons.In general,intensity of temperature inversion is the strongest in winter and weakest in summer.Diurnal variation of inversion of three types is obvious,and frequency and thickness of inversion is greater at 08：00 than at 20：00,so is intensity of inversion.Analysis of characteristic of atmospheric boundary layer inversion in Chengdu area is of important significance to understand diffusion of pollutant in this region.