Surging dynamics of South Rimo Glacier, Eastern Karakoram

Surging dynamics of South Rimo Glacier, Eastern Karakoram
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东喀喇昆仑南里莫冰川的汹涌动态

DOI:
10.1088/1748-9326/ac3175
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发表时间:
2021
期刊:
Environ._Res
影响因子:
--
通讯作者:
龙四春
龙四春
中科院分区:
其他
文献类型:
--
作者:
蒋宗立;王欣;龙四春

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描述冰川涌动事件的动态特征是能够理解其驱动机制的先决条件。本文利用sentinel - 1a卫星的偏移跟踪和TerraSAR-X/TanDEM-X卫星和Ice, Cloud, and land elevation Satellite-2先进地形激光高度计系统的大地测量方法,获得了东喀喇昆仑地区南里莫冰川(SRG)的地表速度和地表高程变化的综合数据。SRG的激增始于2018年夏季,地表速度的快速急剧增加在2019年8月达到峰值(~ 12 m d - 1)。到2020年夏季,SRG地表速度已恢复到浪涌前的水平。我们认为,最近一次SRG浪涌的演变可能是由冰下热条件的变化引发的,并最终由水文过程加速。根据历史分析,SRG的浪涌重现期为~ 25-30年。对地表速度和海拔变化的时空分析可以提供有关浪涌机制及其控制的有用信息。
Describing the dynamic characteristics of glacier surge events is a precursor to being able to understand their driving mechanisms. Here, a comprehensive suite of surface velocities and surface elevation changes for the surging South Rimo Glacier (SRG), situated in the East Karakoram region, are obtained by offset-tracking from Sentinal-1A and geodetic method from TerraSAR-X/TanDEM-X and Ice, Cloud, and land Elevation Satellite-2 Advanced Topographic Laser Altimeter System. The surge of SRG initiated in the summer of 2018, and the rapid and dramatic increase in surface velocities reached a peak (∼12 m d−1) in August 2019. By the summer of 2020, the surface velocity of SRG had returned to its pre-surge level. We interpret that the evolution of the latest SRG surge was probably triggered by changes in subglacial thermal conditions, and was ultimately accelerated by hydrological processes. Based on historical analysis, a surge return period of ∼25–30 years prevails at SRG. Spatiotemporal analyses of surface velocities and elevation changes such as these can provide useful information about surge mechanisms and their controls.
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