| 天气与气候 |
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| Magnetic Properties of Urban Dustfall in North Xinjiang and Its Environmental Significance |
| WANG Li1, XIA Dun-sheng1,2, YU Ye1, TIAN Shi-li1, WANG Bo2 |
| 1.Key Laboratory of Desert and Desertification, Institute of Cold and Arid Regions Environmental and Engineering, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Key Laboratory of West Chinas Environmental System (Ministry of Education), Lanzhou University, Lanzhou 730000, China |
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Abstract Environmental magnetic parameters were used to systematically study magnetic properties of dustfall from a typical urban area (Urumqi) and a rural area (Mori) in Xinjiang, China. The results indicate that: (1) Magnetite is the main controlling magnetic mineral in samples from the two areas, with other kinds of magnetic minerals, such as maghematite and goethite, less dominant. (2) The content of ferrimagnetic mineral in dustfall samples from Urumqi is high, especially for samples collected during winter. Compared with samples from Urumqi, the content of magnetite is lower in samples from Mori. (3) The grain size of magnetic mineral in samples from Urumqi is coarse and dominated by multi-domain and pseudo single-domain grains, while that in samples from Mori is dominated by fine single domain grains. Compared to samples from Mori, the grain size in samples from Urumqi has less seasonal variations. The contrasting magnetic property in samples from the two areas indicates that human activities induce amount of ferrimagnetic minerals and affect the magnetic property in samples from Urumqi, especially in winter.
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Received: 16 November 2009
Published: 20 May 2010
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2010, Vol. 30 
