Acceleration of ice loss across the Himalayas over the past 40 years
Acceleration of ice loss across the Himalayas over the past 40 years
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DOI：
10.1126/sciadv.aav7266
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发表时间：
2019-06-01
期刊：
影响因子：
13.6
通讯作者：
Corley, A.
中科院分区：
文献类型：
--
作者：
Maurer, J. M.;Schaefer, J. M.;Corley, A.
喜马拉雅冰川为南亚人口密集的集水区提供融水，需要对数十年来的冰川变化进行区域观测，以了解气候驱动因素并评估对冰川河流的影响。在这里，我们量化了喜马拉雅山脉1975-2000年和2000-2016年期间冰厚度的变化，使用了一组来自冷战时期间谍卫星电影和现代立体卫星图像的数字高程模型。我们在两个时间段观察到整个2000 km样带的一致冰损失沿着，并发现2000-2016年期间的平均损失率翻了一番[-0.43 +/- 0.14 m w.e.年（-1）（米水当量/年）]与1975-2000年（-0.22 +/-0.13米水当量/年）相比，年（-1）。喜马拉雅山脉冰损失的相似幅度和加速表明区域一致的气候强迫，与大气变暖和相关的能量通量一致，是冰川变化的主要驱动因素。
Himalayan glaciers supply meltwater to densely populated catchments in South Asia, and regional observations of glacier change over multiple decades are needed to understand climate drivers and assess resulting impacts on glacier-fed rivers. Here, we quantify changes in ice thickness during the intervals 1975-2000 and 2000-2016 across the Himalayas, using a set of digital elevation models derived from cold war-era spy satellite film and modern stereo satellite imagery. We observe consistent ice loss along the entire 2000-km transect for both intervals and find a doubling of the average loss rate during 2000-2016 [-0.43 +/- 0.14 m w.e. year(-1) (meters of water equivalent per year)] compared to 1975-2000 (-0.22 +/- 0.13 m w.e. year(-1)). The similar magnitude and acceleration of ice loss across the Himalayas suggests a regionally coherent climate forcing, consistent with atmospheric warming and associated energy fluxes as the dominant drivers of glacier change.