Major Ion Geochemistry of Nam Co Lake and its Sources, Tibetan Plateau |
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Authors: | Qianggong Zhang Shichang Kang Feiyue Wang Chaoliu Li Yanwei Xu |
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Institution: | (1) Institute of Tibetan Plateau Research , Chinese Academy of Sciences (CAS), Beijing, 100085, China;(2) State Key Laboratory of Cryospheric Sciences, CAS, Lanzhou, 730000, China;(3) Graduate University of CAS, Beijing, 100049, China;(4) Department of Environment and Geography, University of Manitoba, Winnipeg, Canada, MB R3T 2N2;(5) Department of Chemistry, University of Manitoba, Winnipeg, Canada, MB R3T 2N2 |
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Abstract: | The major cations and anions from lake water samples and its sources, including glacier snow, precipitation, stream, and swamp
water in the Nam Co basin, central Tibetan Plateau, were studied. The concentrations of the major ions varied significantly
in the five environmental matrices. Generally, the mean concentrations of most ions are in the order of lake water > swamp
water > stream water > precipitation > snow. Rock weathering is the dominant process controlling the chemical compositions
of the stream and swamp waters, with carbonate weathering being the primary source of the dissolved ions. The Nam Co lake
water is characterized by high Na+ concentration and extremely low Ca2+ concentration relative to other ions, resulting from evapoconcentration and chemical precipitation within the lake. Comparison
with the water chemistry of other lakes over the Tibetan Plateau indicated that Nam Co is located in a transition area between
non-saline lakes and highly saline lakes. The relatively low concentration of total dissolved solids is possibly due to the
abundant inflow of glacial meltwater and relatively high annual precipitation. |
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Keywords: | Nam Co Tibetan Plateau Alpine lakes Major ion geochemistry Water Weathering |
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