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《Acta Geographica Sinica》 2006-05
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Comparisons of Stable Isotopic Fractionation in Winter and Summer at Baishui Glacier No. 1, Mt. Yulong

PANG Hongxi1, HE Yuanqing1, 2, LU Aigang1, ZHAO Jingdong1, NING Baoying1, YUAN Lingling1, SONG Bo1, ZHANG Ningning1 (1. Key Laboratory of Cryosphere and Environment, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China; 2. Institute of Tibetan Plateau Research, CAS, Beijing 100029, China)  
Based on the data of δ18O in surface snow, snow pits, meltwater and the glacier-fed river water at Baishui glacier No. 1, Mt. Yulong, the isotopic fractionation behaviors in the typical monsoonal temperate glacier system in winter and summer were compared. The results indicate that the isotopic fractionation degree in summer is larger than that in winter, suggesting that the snow/ice melting is more intense in summer. Moreover, whenever it is in winter or summer, from surface snow to meltwater, and to glacier-fed river water, the gradient ofδ18O with altitude gradually increases. It shows that the degree of isotopic fractionation gradually strengthens when surface snow being converted into meltwater and finally into glacial river water, which suggests that the influence of post-depositional processes onδ18O gradient in the monsoonal temperate glacier region differs spatially.
【Fund】: 国家自然科学基金项目(40501014;90511007);; 冰川冻土特殊学科人才培养项目(J0130084)~~
【CateGory Index】: P343.6
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