The evolution of Fedchenko glacier in the Pamir, Tajikistan, during the past eight decades
The evolution of Fedchenko glacier in the Pamir, Tajikistan, during the past eight decades
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塔吉克斯坦帕米尔地区费琴科冰川过去80年的演变
DOI：
10.3189/2014jog13j110
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发表时间：
2014
影响因子：
3.4
通讯作者：
A. Surazakov
中科院分区：
文献类型：
--
作者：
A. Lambrecht;C. Mayer;V. Aizen;D. Floricioiu;A. Surazakov
Fedchenko冰川是塔吉克斯坦帕米尔高原最大的冰川。由于对冰川的早期精确测绘，有可能评估80多年来的冰川变化，这对这个偏远山区来说是一个非常长的时间。在此期间，在冰川主干上观测到的总体积损失为5 km3，而总面积仅变化了1.4%。观察到，体积损失从冰川的下部向上部消融区迁移。面积相对较小的变化是冰舌上的冰上碎屑覆盖的结果，这在很大程度上使面积损失与体积损失脱钩。迄今为止，观测到的冰川速度并不能反映冰川体积的变化，因为年际变化比迄今可能的长期变化要大。中心消融带的年内流速分布可能反映了基底水系的演化过程。根据冰厚测量和简单冰动力假设，Fedchenko冰川的总积为123.4±8 km3。
Abstract Fedchenko glacier is by far the largest glacier in the Pamir, Tajikistan. Owing to early accurate mapping of the glacier it is possible to evaluate glacier changes over eight decades, which is an exceptionally long time period for this remote mountain region. During this time a total volume loss of 5 km3 was observed on the main trunk of the glacier, while the total area changed by only 1.4%. It is observed that the volume loss migrates from the lower parts of the glacier towards the upper ablation zone. The comparatively small change in area is a result of the supraglacial debris cover on the glacier tongue, which decouples the area loss from the volume loss to a considerable degree. The observed velocities of the glacier do not reflect the volume changes up to now because the interannual variability is larger than possible long-term changes so far. The intra-annual velocity distribution in the central ablation zone probably reflects the evolution of the basal drainage system. Based on ice thickness measurements and simple ice-dynamic assumptions, the total volume of Fedchenko glacier is 123.4 ± 8 km3.