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《Journal of Glaciology and Geocryology》 2006-03
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Glaciers fluctuations in the Karamilan-Keriya River Watershed in the past 30 years

XU Jun-li~(1),LIU Shi-yin~(1,2), ZHANG Shi-qiang~(1),SHANGGUAN Dong-hui~(1) (1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 73000,China;2.Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085,China)  
Responding to the global warming,plenty of glaciers in West China have more or less retreated.In this study,the changes of glaciers in the interior drainage areas of the Karamiran-Keriya Rivers in the Kunlun Mountains were investigated using topographic maps(1970) and Landsat ETM+(1999) imageries.Four methods,non-supervised classification,supervised classification,threshold values of NDSI and threshold values of band ratio,were used to extract the boundaries of 176 glaciers,including smaller ones and larger ones,in the Karamiran-Keriya Rivers,with Landsat ETM+ image,and compared with the results derived from visual interpretation.It is found that the method of threshold values of band ratio is the best.Glaciers fluctuations on the whole Karamiran-Keriya River watershed were estimated by comparing the glacier boundaries derived from Landsat ETM+ images in 1999 with that derived from topographic maps in 1970.If it is not certain for only using the method of threshold values of band ratio,visual interpretation is often used in order to enhance the accuracy.From 1970 to 1999,there were 5 glaciers disappeared,the total glacier area shrank by 2.86% and the ice reserve reduced by 3.10%.
【Fund】: 国家自然科学基金项目(40371026);; 国家自然科学基金重大项目(90202013)资助
【CateGory Index】: P343.6
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