银川市大气逆温特征对空气污染物浓度的影响

通过对银川市2013-2015年逐日探空观测资料及同期银川市六个监测站点的污染物浓度逐时监测数据,对银川市的低空温度层的特征进行了分析,并结合统计数据,分析了逆温层的特征与四种主要空气污染物(SO₂、NO₂、PM10、PM2.5)浓度之间的关系。结果表明,银川市主城区在全年的四季中均有逆温层的存在,但是冬半年逆温发生的频率高于夏半年；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。通过污染物浓度与逆温特性的相关度分析,发现四种主要空气污染物的浓度与逆温层存在相关性,其中,其浓度与逆温层厚度呈正相关,与逆温层强度呈负相关。这说明银川市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。

The impact of Yinchuan city atmospheric inversion characteristics of air pollutant concentrations

: the hourly pollutant concentrations of Yinchuan City 2013-2015 daily sounding data and the same period in Yinchuan City six monioring stations monitoring data, characteristics of Yinchuan City, the low temperature layer are analyzed, and combined with the statistical data, the analysis of the relationship between the characteristics of the inversion layer and four major air pollutants (SO2, NO2, PM10, PM2.5) concentration. The results showed that the main area of Yinchuan City in the year of the four seasons have inversion layer exists, but the frequency of winter half year inversion occurs is higher than in the summer half year; inversion layer thickness in winter with thick and thin in summer, inversion intensity is the strongest in autumn, summer is the weakest. Through the analysis of the relationship between the pollutant concentration and temperature inversion characteristics. It is found that the four kinds of main air pollutants concentration and temperature inversion layer exists correlation. Among them, the concentration and the temperature inversion layer thickness was positively correlated, and intensity of inversion layer was negatively correlated. This shows that Yinchuan city atmospheric inversion stratification in the low level is one of the main factors affecting the degree of air pollution.