New insights into trace element wet deposition in the Himalayas: amounts, seasonal patterns, and implications

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• 作者：Zhiyuan Cong (1)
  Shichang Kang (1) (2)
  Yulan Zhang (1)
  Shaopeng Gao (1)
  Zhongyan Wang (1)
  Bin Liu (1) (3)
  Xin Wan (1) (3)
  
  1. Key Laboratory of Tibetan Environment Changes and Land Surface Processes ; Institute of Tibetan Plateau Research ; Chinese Academy of Sciences ; Building 3 ; Courtyard 16 ; Lincui Road ; Chaoyang District ; 100101 ; Beijing ; China
  2. State Key Laboratory of Cryospheric Sciences ; Cold and Arid Regions Environmental and Engineering Research Institute ; CAS ; 730000 ; Lanzhou ; China
  3. University of Chinese Academy of Sciences ; 100049 ; Beijing ; China
  
• 关键词：Himalayas ; Trace elements ; Wet deposition ; Ice core ; Long ; range transport
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：22
• 期：4
• 页码：2735-2744
• 全文大小：912 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

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.