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《Arid Land Geography》 2008-03
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Precipitation from different water vapor sources in the Heihe River Basin,China

ZHANG Ying-hua1, WU Yan-qing2 (1 Key Laboratory of Water Cycle & Related Land Surface Processes,Institute of Geographic Sciences & Natural Resources Research,CAS, Beijing,100101,China; 2 Shanghai Jiao Tong University, School of Environmental Science and Engineering. Shanghai 200240, China)  
The Heihe River, as one of the greatest inland rivers in China, was confronted with water resources' scarceness due to unreasonable development or utilization. To utilize effectively the limited water resource, isotope techniques was widely used to study water cycle. Precipitation from different water vapor sources was analyzed by using isotope tracers based on some precipitation sampling sites in the Heihe River basin. Based on the analysis of the linear slope of δD-δ18O associated with deuterium excess, conclusions were drawn that water vapor for precipitation in spring and summer mainly come from the ocean air mass, and conversely the precipitation in autumn and winter is mostly formed of continental recycling water. The trajectory of water vapor for one large-scale precipitation in July is from the mountain area to the basin in front of the mountain because of the decline of tritium content in precipitation. Deuterium excess ranges from -45‰ to 65‰ with large scope, which means the complicated water vapor and the complex conditions of precipitation. Deuterium excess is some higher than 10‰ in precipitation at stations near reservoir due to a key role of its evaporation water in water cycle, and that almost equals to 10‰ of the worldwide mean in precipitation of the mountain areas with water vapor controlled by ocean air mass. With the deuterium excess evaluated for water vapor sources, the proportion of precipitation formed by the continental recycling water evaporation was estimated at least 31.06% in total precipitation.
【Fund】: 知识创新工程领域前沿项目(07V70020SZ);; 国家自然科学基金资助项目(40671034)
【CateGory Index】: P426.6
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