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《Quaternary Sciences》 2006-05
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GLACIERS IN RESPONSE TO RECENT CLIMATE WARMING IN WESTERN CHINA

Liu Shiyin ①② Ding Yongjian ① Li Jing ① Shangguan Donghui ① Zhang Yong ① (①Key Laboratory of Cryosphere and Environment,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000; ②Institute for Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085)  
Glaciers in China are primarily located in the Qinghai-Xizang (Tibet) Plateau and surrounding high mountains. The China Glacier Inventory (CGI) indicates that there are over 46377 glaciers in Western China,accounting for 52 percent of the total area in Central Asia. Meteorological records indicate that air temperature in Western China has risen by 0.2℃ per decade,and the 1990s is likely the warmest decade of the millennium; similarly,most of Western China also has seen an increase in precipitation during the past 50 years,for example,precipitation increased by 18% during the last half of the last century in northwestern provinces. Using remote sensing and Geographical Information System (GIS) methods,we have monitored the changes over 5000 glaciers in the past 50 years. We conclude that 82.2% of all the monitored glaciers retreated,while the remaining glaciers were enhanced. It should be mentioned that the enhanced glaciers were not necessarily enhanced over the entire observational period; in the past two decades while regional climate warming has been much evident many of the once expanded glaciers started to retreat. As a whole,glaciers that have been monitored show a total area loss of 4.5% from the late 1950s to the late 1990s. Investigation on glacier changes over the past few decades reveal some regional differences,which is mainly attributed to different dynamical responses of glaciers with different sizes and physical properties along with climate changes of that region. For example,glaciers in central and northwestern parts of the Qinghai-Xizang Plateau were relatively stable,while those in mountains surrounding the Plateau experienced extensive wastage. It is concluded that strong warming and reduced precipitation are likely key drivers for the extensive reduction of ice cover in the eastern and southern parts of the Plateau. In contrast,recent cooling in the northwestern and central parts of the Plateau may partially explain the relatively stable condition of those glaciers. The modest warming trend and increase in precipitation in the southeastern part of the Plateau could account for the modest changes in glaciers there. Although precipitation has increased in Northwest China (Tianshan,Qilian Shan,Eastern Pamirs,and so on),the strong warming may be the principal factor driving glacier retreat although large glaciers with heavy debris covering their ablation areas may also contribute to the variations of ice extent in the region. Glacier recession is a key factor in the variability of water resources in the arid river systems of Northwest China. The recent increase in discharge of these rivers may be partially related to the increase in glacial runoff caused by loss of ice during glacier retreat. Although the glaciers that we (and others) have monitored account for only 10% of the total number and 24% of the total area of glaciers in China,our results may be extrapolated to infer glacier changes in various mountain regions of China.
【Fund】: 国家自然科学基金项目(批准号:40371026和90202013);; 中国科学院知识创新工程项目(批准号:KZCX3-SW-345和KZCX3-SW-339);; 中国科学院寒区旱区环境与工程研究所创新前沿项目(批准号:2004102)联合资助
【CateGory Index】: P343.6;P461
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