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首页> 外文期刊>Geosciences >Glacier Dynamics in Changme Khangpu Basin, Sikkim Himalaya, India, between 1975 and 2016
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Glacier Dynamics in Changme Khangpu Basin, Sikkim Himalaya, India, between 1975 and 2016

机译：1975年至2016年之间，印度锡金喜马拉雅山昌美康普盆地的冰川动力学

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This study provides a high resolution glacier database in the Changme Khangpu Basin (CKB) using LANDSAT 8 (2014) and Sentinel-2A image (2016), mapping of 81 glaciers that cover a 75.78 ± 1.54 km 2 area. Composite maps of land surface temperature, slope and Normalized differential Snow Index have been successfully utilized in delineating near accurate debris cover boundary of glaciers. The cumulative controlling parameters of aspect, elevation, slope, and debris cover have been assessed to evaluate the nature of glacier distribution and dynamics. The local topographic settings seem to have significantly determined the glacier distribution in the CKB. Almost 20% area erstwhile under glacier cover has been lost since 1975 at an average rate of ?0.453 ± 0.001 km 2 a ?1 . The recent decade (2001–2016) has witnessed a higher rate of area shrinkage (?0.665 ± 0.243 km 2 a ?1 ), compared to a relatively lower rate of recession (?0.170 ± 0.536 km 2 a ?1 ) between 1988 and 2001. The lower rates of glacial recession can most likely be induced regionally due to relatively cooler decadal late summer temperatures and peak in the monsoon spell. Glaciers with western and north-western aspects showed more vulnerability to area loss than the rest of the aspects. Lower altitude glaciers have receded faster than ones perched up on higher elevations. The rate of glacier area recession has been nearly twice that on clean glaciers as compared to debris-covered glaciers in the CKB.
机译：这项研究使用LANDSAT 8（2014）和Sentinel-2A影像（2016）提供了昌美康普盆地（CKB）的高分辨率冰川数据库，绘制了覆盖75.78±1.54 km 2面积的81个冰川的地图。地表温度，坡度和归一化微分雪指数的合成图已成功地用于描绘接近精确的冰川碎屑覆盖边界。评估了坡度，高程，坡度和碎屑覆盖率的累积控制参数，以评估冰川分布和动力学的性质。当地的地形设置似乎已大大决定了CKB中的冰川分布。自1975年以来，曾经有近20％的冰川覆盖面积流失，平均流失率为0.453±0.001 km 2 a？1。最近十年（2001-2016年）的面积萎缩率更高（0.665±0.243 km 2 a？1），而1988年至2004年间衰退率相对较低（0.170±0.536 km 2 a？1）。 2001。冰川消退率的降低很可能是区域性的，这是由于年代末夏末温度相对较低和季风季节达到顶峰所致。具有西部和西北方面的冰川显示出比其他方面更大的面积损失脆弱性。低海拔冰川的退缩速度快于高海拔冰川的退缩速度。与CKB中覆盖冰川的冰川相比，冰川面积的衰退速度几乎是清洁冰川的两倍。

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