Elevation change of Fedchenko Glacier, Pamir Mountains, from GNSS field measurements and TanDEM-X elevation models, with a focus on the upper glacier
Elevation change of Fedchenko Glacier, Pamir Mountains, from GNSS field measurements and TanDEM-X elevation models, with a focus on the upper glacier
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DOI：
10.1017/jog.2018.52
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发表时间：
2018-06
影响因子：
3.4
通讯作者：
A. Lambrecht;C. Mayer;A. Wendt;D. Floricioiu;C. Völksen
中科院分区：
文献类型：
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作者：
A. Lambrecht;C. Mayer;A. Wendt;D. Floricioiu;C. Völksen
费德琴科冰川自1928年首次科学考察以来，经历了一次大的厚度损失。作为帕米尔山脉最大的冰川，该冰川对区域冰川物质收支具有重要作用。我们使用2009年至2016年的一系列全球导航卫星系统观测数据和2011年至2016年的TanDEM-X高程模型来调查最近的高程变化。考虑到雷达波的穿透，最大限度地减少了海拔的偏差，否则在Fedchenko冰川的干雪中可能达到6米，在高积累区域的平均值为3 - 4米。海拔季节变化可达± 5 m。多年来，冰川表面高程沿其整个长度沿着下降。与1928 - 2000年相比，2000 - 2016年的减薄率增加了1.8倍，导致峰值为1.5 m a − 1。即使是海拔5000米以上的最高堆积盆地也受到冰川变薄的影响，2009年至2016年的变化率在-0.2米至-0.4米之间。估计整个冰川的质量平衡速率为-0.27 ± 0.05 m w.e.。a 2000年至2011年为− 1，w. e.为− 0.51 ± 0.04 m 2011年至2016年期间a-1。
ABSTRACT Fedchenko Glacier experienced a large thickness loss since the first scientific investigations in 1928. As the largest glacier in the Pamir Mountains, this glacier plays an important role for the regional glacier mass budget. We use a series of Global Navigation Satellite Systems observations from 2009 to 2016 and TanDEM-X elevation models from 2011 to 2016 to investigate recent elevation changes. Accounting for radar wave penetration minimizes biases in elevation that can otherwise reach up to 6 m in dry snow on Fedchenko Glacier, with mean values of 3–4 m in the high accumulation regions. The seasonal elevation changes reach up to ±5 m. The glacier surface elevation decreased along its entire length over multi-year periods. Thinning rates increased between 2000 and 2016 by a factor of 1.8 compared with 1928–2000, resulting in peak values of 1.5 m a−1. Even the highest accumulation basins above 5000 m elevation have been affected by glacier thinning with change rates between −0.2 and −0.4 m a−1 from 2009 to 2016. The estimated glacier-wide mass-balance rates are −0.27 ± 0.05 m w.e. a−1 for 2000 to 2011 and −0.51 ± 0.04 m w.e. a−1 between 2011 and 2016.