Characteristics of atmospheric dust deposition in snow on the glaciers of the eastern Tien Shan, China
Characteristics of atmospheric dust deposition in snow on the glaciers of the eastern Tien Shan, China
复制标题
东天山冰川积雪大气尘埃沉降特征
DOI：
10.3189/002214309790152393
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发表时间：
2009-01-01
影响因子：
3.4
通讯作者：
Zhang, Mingjun
中科院分区：
文献类型：
--
作者：
Dong, Zhiwen;Li, Zhongqin;Zhang, Mingjun
来自地壳表面的风吹矿物气溶胶尘埃是影响地球辐射收支的重要大气成分。本文对天山东部乌鲁木齐1号冰川、哈西勒根51号冰川和庙尔沟冰川的雪中不溶于水的尘埃沉降进行了测定。对积雪深度和浓度的水平分布以及积雪中尘埃粒子通量的分析表明，随着大气环境从西向东的变化，这些冰川上的尘埃沉积各不相同。在0.57-26 μ m粒径范围内，三个地点的微粒平均质量浓度分别为969、1442和3690 μ g kg（-1），并有从西向东增加的趋势。积雪中的灰尘层含有富含Na和Ca的物质，通常在中亚灰尘颗粒中发现。在雪中的灰尘颗粒的体积尺寸分布表现出单峰结构，具有体积中值直径为3-22 μ m。在过去4年中，积雪中的粉尘剖面揭示了频繁的，零星的高粉尘浓度与大的年-年变化，这意味着在天山东部的粉尘沉降是非常敏感的大气环境变化。
Wind-blown mineral aerosol dust derived from the crustal surface is an important atmospheric component affecting the Earth's radiation budget. Deposition of water-insoluble dust was determined in snow deposited on Urumqi glacier No. 1, Haxilegen glacier No. 51 and Miaoergou glacier, eastern Tien Shan, China. Analysis of the horizontal distribution of snow depth and concentration, and flux of dust particles in the snow cover suggests that dust deposition differs on each of these glaciers as the atmospheric environment changes from west to east. Mean mass concentrations of micro-particles in the size range 0.57-26 mu m diameter at the three locations are respectively 969, 1442 and 3690 mu g kg(-1), with an increasing trend from west to east. Dust layers in the snow cover contain Na- and Ca-rich materials typically found in central Asian dust particles. Volume size distributions of dust particles in the snow showed single-modal structures having volume median diameters of 3-22 mu m. Dust profiles in the snow cover over the past 4 years reveal frequent, sporadic high dust concentrations with a large year-to-year variability, implying that dust deposition in the eastern Tien Shan is very sensitive to atmospheric environment change.