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沙尘天气过境前后北京大气污染物质量浓度的变化
引用本文:方修琦,李令军,谢云. 沙尘天气过境前后北京大气污染物质量浓度的变化[J]. 北京师范大学学报(自然科学版), 2003, 39(3): 407-411
作者姓名:方修琦  李令军  谢云
作者单位:1. 北京师范大学资源与环境科学系,100875,北京
2. 北京市环境保护监测中心系统室,100044,北京
基金项目:教育部高校骨干教师资助计划;;
摘    要:影响北京的沙尘天气可分为沙尘暴、浮尘和扬沙3种类型。沙尘暴和浮尘天气发生前后的污染物类型和质量浓度ρ有明显的差异,属2类不同性质的污染。在沙尘天气发生之前,大气中SO2,NO2等气态污染物的ρ往往较高,在大气逆温的情况下污染尤其严重,并且与颗粒物的ρ相关性较好;随着沙尘天气的爆发,颗粒物的ρ骤然增加,但伴随沙尘天气出现的大风使SO2,NO2等污染物的ρ显著下降,大气污染转变为由降尘过程造成的相对单一的颗粒物污染,属典型的沙尘污染。

关 键 词:北京 大气污染物 质量浓度 沙尘天气 沙尘暴 浮尘 扬沙 沙尘污染 降尘 颗粒物污染 环境监测
修稿时间:2002-10-20

DIFFERENCE OF AIR POLLUTION DURING THE DUSTSTORM PROCESS IN BEIJING
Fang Xiuqi ) Li Lingjun ) Xie Yun ). DIFFERENCE OF AIR POLLUTION DURING THE DUSTSTORM PROCESS IN BEIJING[J]. Journal of Beijing Normal University(Natural Science), 2003, 39(3): 407-411
Authors:Fang Xiuqi ) Li Lingjun ) Xie Yun )
Affiliation:Fang Xiuqi 1) Li Lingjun 2) Xie Yun 1)
Abstract:The objective of this paper is to study the difference of air pollution before and after a duststorm event. The results show that duststorm events occurring in Beijing are caused mainly by Mongolia low. There are two different kinds of air pollution in Beijing during a duststorm process. Before a duststorm, chemical air pollutants are in high concentration due to temperature inversion. At the beginning of a duststorm when dust has not come yet, air quality is improved because strong wind blows chemical pollutant like SO 2, NO 2 away, and their concentration is decreased. During the duststorm when dust comes, concentration of PM 10 is increased but atmospheric visibility is decreased. It is typical dust air pollution.
Keywords:duststorm  air pollution  Beijing
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