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Using Landsat images to monitor changes in the snow-covered area of selected glaciers in northern pakistan

Journal of Mountain Science 2017年第10期14卷 2013-2027页

作者： Chaman GUL KANG Shi-chang Badar GHAURI Mateeul HAQ Sher MUHAMMAD Shaukat ALI State Key Laboratory of Cryosphere Science Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 73000 China University of Chinese Academy of Sciences No.19A Yuquan Road Beijing 100049 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101 China Institute of Space Technology (IST) Karachi Pakistan Space and Upper Atmosphere Research Commission (SUPARCO) Karachi Pakistan global Change Impact Studies Centre (GCISC) Ministry of Climate Change Islamabad Pakistan

Landsat satellite images were used to map and monitor the snow-covered areas of four glaciers with different aspects(Passu: 36.473°N, 74.766°E;Momhil: 36.394°N, 75.085°E; Trivor: 36.249°N,74.968°E; and Kunyang: 36.083°N, 75.288°E) in the upper Indus basin, northern pakistan, from 1990-2014. The snow-covered areas of the selected glaciers were identified and classified using supervised and rule-based image analysis techniques in three different seasons. Accuracy assessment of the classified images indicated that the supervised classification technique performed slightly better than the rule-based technique. snow-covered areas on the selected glaciers were generally reduced during the study period but at different rates. glaciers reached maximum areal snow coverage in winter and premonsoon seasons and minimum areal snow coverage in monsoon seasons, with the lowest snow-covered area occurring in August and September. The snowcovered area on Passu glacier decreased by 24.50%,3.15% and 11.25% in the pre-monsoon, monsoon and post-monsoon seasons, respectively. Similarly, the other three glaciers showed notable decreases in snow-covered area during the pre-and post-monsoon seasons; however, no clear changes were observed during monsoon seasons. During pre-monsoon seasons, the eastward-facing glacier lost comparatively more snow-covered area than the westward-facing glacier. The average seasonal glacier surface temperature calculated from the Landsat thermal band showed negative correlations of-0.67,-0.89,-0.75 and-0.77 with the average seasonal snowcovered areas of the Passu, Momhil, Trivor and Kunyang glaciers, respectively, during pre-monsoon seasons. Similarly, the air temperature collected from a nearby meteorological station showed an increasing trend, indicating that the snow-covered area reduction in the region was largely due to climate warming.

关键词： snow-covered area glacier global warming classification technique northern pakistan

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