Glacier change in the western Nyainqentanglha Range,Tibetan Plateau using historical maps and Landsat imagery: 1970-2014 |
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Authors: | Kun-peng Wu Shi-yin Liu Wan-qin Guo Jun-feng Wei Jun-li Xu Wei-jia Bao Xiao-jun Yao |
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Institution: | 1.State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Science,Lanzhou,China;2.University of Chinese Academy of Sciences,Beijing,China |
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Abstract: | Glaciers in the western Nyainqentanglha Range are an important source of water for social and economic development. Changes in their area were derived from two Chinese glacier inventories; one from the 1970 1:50,000 scale Chinese Topographic Maps series and the other from Landsat TM/ETM+ images acquired in 2009. Analyses also included boundaries from 2000 and 2014 Landsat TM/ETM+ images. A continuing and accelerating shrinkage of glaciers occurred here from 1970 to 2014, with glacier area decreasing by 244.38 ± 29.48 km2 (27.4% ± 3.3%) or 0.62% ± 0.08% a–1. While this is consistent with a changing climate, local topographic parameters, such as altitude, slope, aspect and debris cover, are also important influences. Recession is manifested by a rise in the elevation of the glacier terminus. The shrinkage of glaciers with NE, N and NW orientations exceeded that of other aspects, and glaciers with SE and S orientations experienced less shrinkage. Changes in the average positive difference of glaciation (PDG) show that the western Nyainqentanglha Range has unfavorable conditions for glacier maintenance which is being exacerbated by a warming climate since 1970. |
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