拉萨市几种空气污染物浓度变化与气象要素之间的关系分析

文章利用2000年6月至2005年12月拉萨市几种主要污染物SO2、NO2及PM10的浓度逐日监测数据,以及风速、风向、降水、水平能见度及太阳总辐射量等资料,分别对拉萨市几种主要污染物浓度与同期气象要素之间的关系进行了分析,并针对冬夏气候特点,分析了夏半年、冬半年拉萨市NO2污染物浓度与太阳总辐射量的相互关系。结果表明：拉萨市空气质量总体上保持良好水平;三种污染物浓度与降水强度呈显著负相关;SO2和NO2浓度与风速呈负相关,与风向变化不大,而PM10与风速、能见度呈正相关关系;在干（冬）季时,NO2的浓度值要比湿季时略高,且NO2浓度值与太阳总辐射量之间呈负相关。

Correlative Analysis on Relationship between Changes of Several Main Contaminations and Some Meteorological Elements in Lhasa Urban Area

The concentrations of pollutions in ambient air, and hence their impacts are determined not only by the rates of emissions and chemical transformations, but also to a large extent by weather conditions. The correlations between concentrations of three major air pollutants, such as SO2, NO2 and PM10, and several meteorological elements, such as wind speed, wind direction, horizontal visibility, global solar radiation and precipitation were analyzed. Daily data of the contamination concentrations and the meteorological elements from June, 2000 to December, 2005 were used in this study. The results are as follows： （1） The correlation between air pollutant concentrations and precipitation are significantly negative correlation. （2） The correlation between SO2,NO2 and wind speed are negative. For PM10 it is positive. All three pollutants, the concentration does not vary significantly with wind direction. Finally, daily NO2 concentrations are plotted against daily global radiation for the wet and for the dry season.