| 天气与气候 |
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| Influence of a Severe Dust Storm on Chinese Cities Air Quality |
| ZHANG Jia yun; LIU Xiao dong |
| 1.Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China; 2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract During April 8th to 12th, 2006, a severe dust storm occurred in northern China. The climatic background of drought, synoptic situation and the impact of this dust storm on Chinese cities air quality are documented in the current study. The main results can be summarized as follows:①The distribution of satellite-observed aerosol index (AI) shows a high value region and two sub-high value regions in northern China. The former lies in western part of Inner Mongolia, Hexi Corridor and Hetao area, and the latter two lie in Taklimakan desert, North China to Northeast China. The meteorological observation stations with minimal visibility lower than 10 km mainly distribute in the three above-mentioned regions. The spatial patterns of AI and the minimal visibility are similar. ②The impact area of this dust weather was mainly located on north of 33°N. Moreover, the influence of the dust storm weakened gradually from west to east and the cities influenced most severely by the dust storm concentrated on the eastern part of Northwest China. Based on the lead-lag relationship between the arrival of cold front and the occurrence of air pollution, the cities which suffered from the dust storm can be divided into two kinds. In the first kind of cities, the air pollution event concurred with the arrival of cold front; and in the second kind of cities, the air pollution event occurred before the arrival of cold front, with a lasting time relatively longer than that in the first kind of cities.
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Received: 16 August 2006
Published: 20 January 2008
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2008, Vol. 28 
