Overall recession and mass budget of Gangotri Glacier, Garhwal Himalayas, from 1965 to 2015 using remote sensing data
Overall recession and mass budget of Gangotri Glacier, Garhwal Himalayas, from 1965 to 2015 using remote sensing data
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DOI：
10.1017/jog.2016.96
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发表时间：
2016-01-01
影响因子：
3.4
通讯作者：
Buchroithner, Manfred F.
中科院分区：
文献类型：
--
作者：
Bhattacharya, Atanu;Bolch, Tobias;Buchroithner, Manfred F.
本研究调查了1968年至2014年期间被碎片覆盖的甘戈特里冰川及其支流冰川的变薄率、1965年至2015年期间长度变化和冰川口空出面积以及过去二十年冰面速度的季节性变化。研究发现，甘戈特里及其支流冰川的质量损失略小于喜马拉雅地区其他被碎片覆盖的冰川的质量损失。与 1993-2006 年相比，2006-14 年的平均速度下降了约 6.7%。从1965年到2015年，甘戈特里冰川主干的碎片覆盖面积显着增加，2006-15年增加率最大（0.8+/-0.2km(2)a(-1)）。近几年（2006-2015年）的回撤（类似9.0+/-3.5mA(-1)）较少，但同期（2006-2014年）的下降（0.34+/-0.2mA(-1)）高于1968-2006年的下降（0.20+/-0.1mA(-1)）。该研究强化了一个既定事实，即冰川长度变化是对气候变化的延迟反应，此外还受到碎片覆盖的影响，而冰川质量平衡是更直接和即时的反应。因此，建议研究冰川质量平衡而不仅仅是冰川范围，以得出冰川对气候变化的响应。
Thinning rates for the debris-covered Gangotri Glacier and its tributary glaciers during the period 1968-2014, length variation and area vacated at the snout from 1965 to 2015, and seasonal variation of ice-surface velocity for the last two decades have been investigated in this study. It was found that the mass loss of Gangotri and its tributary glaciers was slightly less than those reported for other debris-covered glaciers in the Himalayan regions. The average velocity during 2006-14 decreased by similar to 6.7% as compared with that during 1993-2006. The debris-covered area of the main trunk of Gangotri Glacier increased significantly from 1965 until 2015 with the maximum rate of increase (0.8 +/- 0.2 km(2) a(-1)) during 2006-15. The retreat (similar to 9.0 +/- 3.5 m a(-1)) was less in recent years (2006-2015) but the down-wasting (0.34 +/- 0.2 m a(-1)) in the same period (2006-2014) was higher than that (0.20 +/- 0.1 m a(-1)) during 1968-2006. The study reinforced the established fact that the glacier length change is a delayed response to climate change and, in addition, is affected by debris cover, whereas glacier mass balance is a more direct and immediate response. Therefore, it is recommended to study the glacier mass balance and not only the glacier extent, to conclude about a glacier's response to climate change.