关键词: 乌鲁木齐, 大气污染物, PM10, 空间分布, 风场特征

Abstract:

In this paper we analyzed the spatial distributions of atmospheric contaminations in different seasons around Urumqi city by using three kinds of contamination concentration data which were observed during 1999—2001 at Urumqi Monitoring Stations. The results show that the predominant contamination is PM10 and the largest concentration area is Tianshan district. We also analyzed the mean annual characteristics and seasonal variations of surface wind and high level wind at 1 000 m. We found that in winter, there are convergence wind flows in southern and northern city, whereas in summer the air flows are divergent within the whole city. The frequency of stationary wind in winter is relatively high. With these conclusions we can explain the reasons of variation of contaminations concentrations of Urumqi in winter and summer from an aspect.

Key words: Urumqi, atmospheric contamination, PM10, spatial distribution, characteristic of surface wind field