兰州市区大气污染与气象条件的关系

The Relations between the Meteorological Conditions and the Air Pollution over the city of Lanzhou

本文利用１９８９年１２月１—１５日兰州大气边界层和大扩散监测试验期间的气象和污染浓度资料，分析了此段时间内兰州市区大气污染现状和相应的天气环流形势，并计算了有关空气污染气象参数。结果表明，该试验期间高空５００ｈＰａ等压面上欧亚范围的主要环流形势为两槽一脊型；地面天气图上分别在５日和１０日有两次冷锋经过兰州，当冷锋来临之前污染浓度逐渐增高，冷锋过境后污染浓度有很大差异，空气污染浓度的变化与气象条件有显著的相关关系。

Based on the meteorological and air pollution concentration data obtained in the experiment of monitoring the atmospheric boundary layer and its diffusion over the complex terrain in Lanzhou from 1to 15 December. 1 989. the variation of air pollution concentration.atmospheric circulation types and meteorological parameters have been analysed. According to 500hpa upper weather map, the circulation situation was marked by two troughs and one ridge over the land of Asia and Europe. Two cold fronts passed through Lanzhou on the surface synoptic chart and there were three successive pressure systems controling this region.The air pollution concentrations changed obviously with different synoptic systems. Beford a cold front arrived, the air pollution concentration gradually increased. and when the cold front passed, it clearly decreased. The relations between air pollurtion concentrations and synocptic conditions were presented in this paper.