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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (3): 832-839    DOI: 10.7522/j.issn.1000-694X.2013.00119
Weather and Climate     
Magnetic Characteristics of Dustfall in Daxing District, Beijing, China and Its Environmental Implications
TIAN Shi-li1, XIA Dun-sheng1,2, YU Ye1, WANG Bo2, XU Shu-jing2
1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2.Ministry of Education Key Laboratory of Western Chinas Environmental System, Lanzhou University, Lanzhou 730000, China
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Abstract  

We investigated the magnetic characteristics of the dustfall samples collected from Daxing District of Beijing by using the magnetic methods.Furthermore, we explored the application of environmental magnetism to the source apportionment and diffusion of pollutants based on the comparison of the magnetic analysis results to that of dustfall sampled from Chaoyang District of Beijing and Lanzhou, respectively.The results reveal that the concentration of magnetic mineral in dustfall sampled from Daxing District is much higher than that in the topsoil of the same area. The main magnetic minerals in the dustfall are magnetite and maghemite, and the main magnetic grain sizes are mainly pseudo single-domain(PSD) and multi-domain(MD). The content of magnetic mineral in dustfall sampled from Chaoyang District is much higher than that from Daxing District, which implies that air pollution was significantly affected by population density, traffic condition and the urbanization level. The seasonal variability of the content of magnetic mineral in dustfall sampled from Daxing District and Lanzhou  indicates that the air quality of Beijing has been improved by the reduced impacts of coal-firing. Inferred from meteorological data, we found that local precipitation, low pressure and high wind speed were conducive to the removal as well as diffusion of atmospheric particulate matter, while low temperature has a significant negative impact on that.

Key words:  dustfall      environmental magnetism      Daxing District of Beijing      meteorological elements      heating period     
Received:  30 March 2012      Published:  23 May 2012
ZTFLH:  X513  

Cite this article: 

TIAN Shi-li1, XIA Dun-sheng1,2, YU Ye1, WANG Bo2, XU Shu-jing2. Magnetic Characteristics of Dustfall in Daxing District, Beijing, China and Its Environmental Implications. JOURNAL OF DESERT RESEARCH, 2013, 33(3): 832-839.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00119     OR     http://www.desert.ac.cn/EN/Y2013/V33/I3/832

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