杭州市大气逆温特征及对空气污染物浓度的影响

利用2003—2009年杭州市逐日探空观测资料及杭州市环境监测站空气污染物浓度监测资料,对杭州市主城区低空温度层结特征及与3种主要空气污染物（SO2、NO2和PM10）浓度之间的关系进行了统计分析。结果表明：杭州市主城区低空大气温度层结全年以弱稳定为主,一年四季皆有逆温层存在;冬半年逆温发生频率高于夏半年,逆温层厚度冬季较厚、夏季较薄,逆温强度秋季最强、夏季最弱。通过计算污染物浓度与逆温特性的相关关系,发现污染物浓度与逆温层底高呈负相关,与逆温频率、厚度、强度呈正相关,由此说明杭州市主城区低空大气逆温层结状况是影响当地空气污染程度的主要因素之一。

Characteristics of atmospheric inversion temperature and its influence on concentration of air pollutants in Hangzhou,Zhejiang province

Based on the daily sounding data and the concentration monitoring data of air pollutants from 2003 to 2009,the characteristics of temperature stratification in the low level and its relationship with concentrations of 3 major pollutants（SO2,NO2 and PM10）were analyzed.The results indicate that atmospheric temperature stratification in the low level is mainly weakly stable in the whole year,and inversion temperature layer always exists in each season.The frequency of occurrence of inversion temperature is higher in winter than in summer;the thickness of inversion layer is deep in winter and thin in summer;the intensity of that is strong in autumn and weak in summer.The concentrations of pollutants are in a negative correlation with the height of the inversion base,while it is in a positive correlation with frequency,thickness and intensity of the inversion layer.Therefore,atmospheric inversion stratification in the low level is one of the important factors influencing air pollution level in Hangzhou.