δ13C-δ18O Covariance: An Effective Indicator of Hydrological Closure for Lakes? |
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引用本文: | CHEN Jing’an,WANG Fushun,WAN Guojiang,TANG Degui,David Dian ZHANG,HUNAG Ronggui,LI Jian,XIAO Tangfu.δ13C-δ18O Covariance: An Effective Indicator of Hydrological Closure for Lakes?[J].Acta Geologica Sinica,2008,82(5):975-981. |
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作者姓名: | CHEN Jing’an WANG Fushun WAN Guojiang TANG Degui David Dian ZHANG HUNAG Ronggui LI Jian XIAO Tangfu |
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作者单位: | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang550002, Guizhou;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang550003, Guizhou;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang550004, Guizhou;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang550005, Guizhou;Department of Geography, University of Hong Kong, Pokfulam Road, Hong Kong;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang550003, Guizhou;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang550004, Guizhou;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang550005, Guizhou |
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基金项目: | This work was supported by the National Natural Science Foundation of China (Grant No. 40673068) and the National Basic Research Program of China (Grant No. 2006CB403201). |
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摘 要: | The correlation between the δ^13C and δ^13C-δ^18O in primary carbonates is affected by several factors such as hydrological balance, total CO2 concentrations, climatic condition and lake productivity. The influence of these factors on the δ^13C-δ^18O correlation may be different on different time scales. In this paper, two different-type lakes in southwestern China, Lake Erhai and Lake Chenghai, are selected to investigate the influence of climatic pattern on the δ^13C-δ^18O correlation and to evaluate the reliability of the δ^13C-δ^18O covariance as an indicator of hydrological closure. The results show that there exists good correlation between the δ^13C and δ^18O in Lake Erhai (overflowing open lake) and in Lake Chenghai (closed lake). This suggests that the δ^13C-δ^18O covariance may be not an effective indicator of hydrological closure for lakes, especially on short time scales. On the one hand, a hydrologically open lake may display covariant δ^13C and δ^18O as a result of climatic influence. The particular alternate warm-dry and cold-wet climatic pattern in southwestern China may be the principal cause of the δ^13C-δ^18O covariance in Lake Erhai and Lake Chenghai. On the other hand, a hydrologically closed lake unnecessarily displays covariant trends between δ^13C and δ^18O because of the buffering effect of high CO2 concentration on the δ^13C shift in hyper-alkaline lakes. We should be prudent when we use the covariance between δ^13C and δ^18O to judge the hydrological closure of lake.
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关 键 词: | 碳酸盐 气候模式 水文学闭和 湖泊 |
收稿时间: | 9/5/2007 12:00:00 AM |
修稿时间: | 2008/1/17 0:00:00 |
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