[Characteristics of atmospheric dust deposited in snow on Urumqi Glacier No.1 of eastern Tian Shan, China: a comparison of measurements during Asian dust period with non-dust period].

Deposition of atmospheric dust was measured in the snow on Glacier No.1 at the headwater of Urumqi River in eastern Tian Shan, central Asia. An analysis of seasonal change of concentration of dust particles in the snow cover suggests that number concentration of dust particle is significantly high from April to June (439 x 10(3)/mL), which may be caused by Asian dust storm in spring. The comparison of mass-size distribution of dust particles between April to August shows an obvious change trend. The distribution of particles changes from single model (3-21 microm) in non-dust period before April, to bio-model (3-21 microm and 20-80 microm) during Asian dust period, and to single model (3-21 microm) after June in non-dust period again. Ca2+ concentration in the snow is also very high from April to June, while NH4+ and SO4(2-), as water-soluble constituents the concentration change is different from each other. Backward trajectory was also employed to examine the transport process of air mass in this region.