Assessment of Sulfate Sources in High-Elevation Asian Precipitation Using Stable Sulfur Isotopes

Lee E.Pruett; Karl J.Kreutz; Moire WadleighVladimir Aizen

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Assessment of Sulfate Sources in High-Elevation Asian Precipitation Using Stable Sulfur Isotopes

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Stable sulfur isotope measurements (delta~(34)S) made on samples collected from a 2 m snowpit on the Inilchek Glacier,Tien Shan Mountains (42.16deg N,80.25deg E,5100 m) are used to estimate sources of sulfate (SO_4~(2-) ) in high-elevation Central Asian precipitation.Comparison of snowpit oxygen isotope (delta~(18)O) data with previous work constrains the age of the snowpit samples to the summer season during which they were retrieved (1999).delta~(34)S measurements were made at 10 cm resolution (20 samples total),with delta~(34)S values ranging from 0.4 during background (SO_4~(2-)<1 muequiv L~(-1)) periods to 19.4 during a single high SO_4~(2-) event.On the basis of the significant correlation (r=0.87) between SO_4~(2-) and delta~(34)S values,coupled with major ion concentration time series and concentration ratios,we suggest a two-component mixing system consisting of evaporite dust and anthropogenic SO_4~(2-) to explain the observed delta~(34)S values.Using a regression model,we estimate that during the 1999 summer season 60 of the deposited SO_4~(2-) was from an evaporite dust source,while 40 of the SO_4~(2-) was from anthropogenic sources.Due to the potentially large and unconstrained range of delta~(34)S values for both evaporite and anthropogenic SO_4~(2-) sources in Asia,the error in our estimates is difficult to assess.However,the delta~(34)S data from the 1999 Tien Shan snowpit provide the first unambiguous identification of evaporite and anthropogenic SO_4~(2-) in high-elevation Asian precipitation,and future ice core studies using improved analysis techniques and source delta~(34)S values can provide detailed information on sulfur biogeochemistry and anthropogenic impacts in Asian alpine regions.

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《Environmental Science & Technology: ES&T》 |2004年第18期|4728-4733|共6页
作者
Lee E.Pruett; Karl J.Kreutz; Moire WadleighVladimir Aizen;
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Climate Change Institute and Department of Earth Sciences,University of Maine,Orono,Maine 04469,Department ofEarth Sciences,Memorial University,St.John's,Newfoundland,A1B 3X5 Canada,and Department of Geography,University of Idaho,Moscow,Idaho 83844;

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正文语种英语
中图分类环境化学;
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Assessment of Sulfate Sources in High-Elevation Asian Precipitation Using Stable Sulfur Isotopes

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