New insights into trace element wet deposition in the Himalayas: amounts, seasonal patterns, and implications
New insights into trace element wet deposition in the Himalayas: amounts, seasonal patterns, and implications
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对喜马拉雅山微量元素湿沉降的新见解：数量、季节模式和影响
DOI：
10.1007/s11356-014-3496-1
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发表时间：
2015-02-01
影响因子：
5.8
通讯作者：
Wan, Xin
中科院分区：
文献类型：
--
作者：
Cong, Zhiyuan;Kang, Shichang;Wan, Xin
我们的研究提供了第一个完整的长达一年的数据集的微量元素湿沉降在高喜马拉雅山的基础上，共42湿沉降事件的北方山。珠穆朗玛峰（珠峰）。除典型的地壳元素（Al、Fe和Mn）外，大部分微量元素（Sc、V、Cr、Co、Ni、Cu、Zn、As、Mo、Cd、Sn、Cs、Pb、Bi和U）的含量水平与东绒布冰川雪坑和冰芯中的含量水平基本相当。镉是受人为排放影响最大的元素。尽管运输途径不同，但大多数微量元素没有明显的季节性变化。在我们的研究中，湿降水的组成反映了一个区域的背景条件，并没有明确的具体来源地区。对于喜马拉雅山冰芯和雪坑的微量元素记录，可以推断，明显的季节性模式是由微量元素（气溶胶）在降水事件后长期暴露于大气中的干沉积造成的。我们的研究结果是有价值的微量元素的沉积机制在喜马拉雅山的理解。
Our research provides the first complete year-long dataset of wet deposition of trace elements in the high Himalayas based on a total of 42 wet deposition events on the northern slope of Mt. Qomolangma (Everest). Except for typical crustal elements (Al, Fe, and Mn), the concentration level of most trace elements (Sc, V, Cr, Co, Ni, Cu, Zn, As, Mo, Cd, Sn, Cs, Pb, Bi, and U) are generally comparable to those preserved in snow pits and ice cores from the nearby East Rongbuk Glacier. Cadmium was the element most affected by anthropogenic emissions. No pronounced seasonal variations are observed for most trace elements despite different transport pathways. In our study, the composition of wet precipitation reflects a regional background condition and is not clearly related to specific source regions. For the trace element record from ice cores and snow pits in the Himalayas, it could be deduced that the pronounced seasonal patterns were caused by the dry deposition of trace elements (aerosols) during their long exposure to the atmosphere after precipitation events. Our findings are of value for the understanding of the trace element deposition mechanisms in the Himalayas.