四川盆地一次持续性雾霾天气过程分析  

Analysis of a Duration Haze Event in Sichuan Basin

作　　者：陈朝平[1] 杨康权[1] 冯良敏 龙柯吉[1] 

机构地区：[1]四川省气象台,成都610072

出　　处：《高原山地气象研究》2015年第3期73-77,共5页Plateau and Mountain Meteorology Research

基　　金：四川省环保厅课题(2013HBZX03)

摘　　要：利用空气质量监测资料、NCEP分析场资料、常规气象观测资料,对2014年1月22日-2月4日四川盆地一次持续性雾霾天气过程的特点及环流背景进行了分析。结果表明：此次持续14天的雾霾天气过程发生在中高纬纬向型环流背景下,青藏高原到四川盆地的西风气流不利于冷空气南下以及降水的产生,同时我国大部分地方处于地面高压内的均压场中,气压梯度力小,近地面风速小,有利于雾霾的形成和维持。大气混合层高度的变化对雾霾之间的转换有很好的指示作用,霾的混合层高度比大雾和轻雾的高,且霾的相对湿度比低,温度露点差比雾大,逆温强度比雾弱,这些都为雾霾之间的转换预报提供了很好的参考依据。Using the air quality monitoring data,NCEP reanalysis data and conventional observation data,the characteristic and circulation of consecutive haze process on large- scale in Sichuan Basin from 22 January to 5 February 2014 are analyzed. The results show that the persistent 14 days heavy pollution process occurs under the stable background of zonal circulation in middle- high latitude. The westerly flow is relative flat and straight wind form the Tibetan Plateau to Basin is not conducive to cold air southward and generate precipitation at the same time,most areas in China is under the control of almost- same pressure field,that the pressure gradient force and the low level near-to-ground wind speed is very small,it will conducive to the formation and maintenance of haze. Also the change of the atmosphere mixed layer＇ height is a good indication for the conversion between haze and fog. The haze＇s mixed-layer-height is higher,the relative humidity is lower. The difference between temperature and dew- point temperature is larger and the temperature Inversion is weaker than fog＇s,all of these provide a good reference for forecasting the conversion between the haze and the fog.

关 键 词：持续性污染天气 气象成因 逆温 混合层高度 

分 类 号：P458.3[天文地球—大气科学及气象学]