辽宁中部地区灰霾天气气候环境特征

利用的1961—2007年辽宁中部地区6个城市的地面常规气象资料以及2002—2007年的东亚地面和高空天气形势资料,2005—2007污染监测资料,统计分析了辽宁中部地区气候环境特征对灰霾天气形成的有利形势与不利的地面天气形势,对比颗粒物资料与实况资料分析了灰霾天气常见的天气形势。结果表明：由于特殊的环境特征与气象条件,灰霾易发时期为秋冬春季节。不利于大气扩散易形成灰霾天气的地面天气形势可分为高压类、低压类、均压类。蒙古高压、东北地形槽以及长白山小高压等局地不利的天气形式对灰霾天气产生有重要影响。常见灰霾天气形势为冷高压型、占65%左右,低压槽型、占13.5%,冷锋过境型,冷锋前部型以及长白山小高压等。

Synoptic, climatic and environmental characteristics of haze in center area of Liaoning province

According to East-Asian synoptic map from 2002 to 2007 and surface meteorological data of 6 weather stations from 1961 to 2007 as well as pollutant monitoring data from 2005 to 2007 in central area of Liaoning province,the advantage and disadvantage weather situations forming haze were analyzed.Synoptic situation of common haze was also discussed by comparison of observation and real data.The results indicated that haze often occurs in autumn,winter and spring due to special environmental conditions and meteorological factors in center area of Liaoning province.Moreover,surface weather situation forming haze easily can be classified as high pressure type,mean pressure type and low pressure type.Mongolian high pressure,topographic trough from northeast and weak high pressure in Changbai Mountain were primary controlling factors to haze weather.Synoptic situations of common haze in central area of Liaoning province include cold high pressure type,low pressure trough type,cold front type over the field,foreside type of cold front and weak high pressure in Changbai Mountain and so on.Of them,the first type and second type account for 65% and 15%,respectively.