OALib Journal期刊
ISSN: 2333-9721
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纳木错流域近30年来湖泊—冰川变化对气候的响应
DOI: 10.11821/xb200703007, PP. 301-310
Keywords: 青藏高原,纳木错,湖泊,冰川,遥感
Abstract:
利用1970航测地形图和1991、2000年两期卫星影像数据,人工建立数字高程模型(DEM),解译不同时期的湖泊、冰川边界,在GIS技术支持下采用图谱的方法,定量分析了湖泊、冰川的面积变化情况。结果表明,自1970~2000年期间,纳木错湖面面积从1941.64km2增加到1979.79km2,增加的速率为1.27km2/a;流域内冰川的面积从167.62km2减少到141.88km2,退缩速率为0.86km2/a。其中,湖面面积在1991~2000年的增加速率为1.76km2/a,明显大于其在1970~1991年的1.03km2/a;而冰川面积在1991~2000年的退缩速率为0.97km2/a,明显大于其在1970~1991年的0.80km2/a。对比该流域前后两个时期的气温、降水和蒸发变化,发现升温幅度的增加是冰川加速退缩的根本原因,而湖面的加速扩张主要受冰川的加剧退缩及其引起的融水增加影响,但与区域降水量略微增加和蒸发量显著减少也具有密切联系。区域降水增加和蒸发减少及其与湖面扩张之间的内在联系仍是一个需要深入探讨的问题。
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