Debris-covered glacier anomaly? Morphological factors controlling changes in the mass balance, surface area, terminus position, and snow line altitude of Himalayan glaciers
Debris-covered glacier anomaly? Morphological factors controlling changes in the mass balance, surface area, terminus position, and snow line altitude of Himalayan glaciers
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DOI：
10.1016/j.epsl.2017.04.039
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发表时间：
2017-08
影响因子：
5.3
通讯作者：
F. Salerno;S. Thakuri;G. Tartari;T. Nuimura;S. Sunako;A. Sakai;K. Fujita
中科院分区：
文献类型：
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作者：
F. Salerno;S. Thakuri;G. Tartari;T. Nuimura;S. Sunako;A. Sakai;K. Fujita
在喜马拉雅山中南部，控制碎屑覆盖的冰川对气候变化的异质反应的主要形态因素是什么？一个争论是开放的，是否在碎片覆盖的冰川变薄的速度是可比的，那些没有碎片的。以前的研究采用了确定性的方法，这是必不可少的，但也是有限的，因为只有少数冰川可以监测。在这种情况下，我们提出了一个更广泛的冰川人口的基础上，作为这些确定性研究的补充统计分析。我们分析了位于Mt.南坡的28个冰川。1992-2008年期间喜马拉雅山脉中南部的珠峰。这项研究结合了三项不同研究为共同时期和冰川人口编制的数据，用于强大的统计分析。一般而言，地表坡度是控制冰川特征及其对气候变化响应的主要形态因子。特别是，出现的要点如下。1)下游表面梯度的减小是冰川变薄增加的原因。2)冰上池塘的发展是冰川变薄的另一个控制因素：冰上池塘发展的地方，冰川的表面进一步下降。3)碎片覆盖率和厚度指数没有被发现是显着负责发展的冰上池塘，海拔变化，或雪线高度的变化。
What are the main morphological factors that control the heterogeneous responses of debris-covered glaciers to climate change in the southern central Himalaya? A debate is open whether thinning rates on debris-covered glaciers are comparable to those of debris-free ones. Previous studies have adopted a deterministic approach, which is indispensable, but is also limiting in that only a few glaciers can be monitored. In this context, we propose a statistical analysis based on a wider glacier population as a complement to these deterministic studies. We analysed 28 glaciers situated on the southern slopes of Mt. Everest in the central southern Himalaya during the period 1992–2008. This study combined data compiled by three distinct studies for a common period and population of glaciers for use in a robust statistical analysis. Generally, surface gradient was the main morphological factor controlling the features and responses of the glaciers to climate change. In particular, the key points that emerged are as follows. 1) Reduced downstream surface gradient is responsible for increased glacier thinning. 2) The development of supraglacial ponds is a further controlling factor of glacier thinning: where supraglacial ponds develop, the glaciers register further surface lowering. 3) Debris coverage and thickness index were not found to be significantly responsible for the development of supraglacial ponds, changes in elevation, or shifts in snow line altitude.