Characteristics of aerosol dust in fresh snow in the Asian dust and non-dust periods at Urumqi glacier no. 1 of eastern Tian Shan,China |
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| Authors: | Zhiwen Dong Zhongqin Li Cunde Xiao Feiteng Wang Mingjun Zhang |
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| Institution: | 1.State Key Laboratory of Cryospheric Sciences/Tian Shan Glaciological Station, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,People’s Republic of China;2.College of Geography and Environment Science,Northwest Normal University,Lanzhou,People’s Republic of China |
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| Abstract: | Windblown mineral aerosol dust derived from the crustal surface is an important atmospheric component affecting the earth’s
radiation budget. Deposition of atmospheric dust was measured in the fresh snow on glacier no. 1 at the headwater of the Urumqi
River in eastern Tian Shan, central Asia. An analysis of seasonal variation of concentrations of dust particles in the snow
suggests that the number concentration of dust particle is significantly high from April to June, which may be caused by Asian
dust storms in the spring. The comparison of mass-size distribution of dust particles from April to August shows an obvious
seasonal change trend. The distribution of particles changes from single model (3–21 μm) in the non-dust period before dust
events in April, to bi-model (3–21 and 20–80 μm) during the Asian dust period, and to single model (3–21 μm) after July in
the non-dust period again. The Ca2+ concentration in the fresh snow is also very high from April to June, while NH4
+ and SO4
2−, as water-soluble constituents, have concentration changes that are different from each other. Backward trajectory was also
employed to examine the transport process of air mass in this region. |
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