气候变化领域集成服务门户(CCPortal): The Surge of the Hispar Glacier, Central Karakoram: SAR 3-D Flow Velocity Time Series and Thickness Changes

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DOI	10.1029/2019JB018945
	The Surge of the Hispar Glacier, Central Karakoram: SAR 3-D Flow Velocity Time Series and Thickness Changes
	Guo, Lei; Li, Jia; Li, Zhi-wei; Wu, Li-xin; Li, Xin; Hu, Jun; Li, Hui-lin; Li, Hong-yi; Miao, Ze-lang; Li, Zhong-qin
通讯作者	Li, J (通讯作者)
发表日期	2020
ISSN	2169-9313
EISSN	2169-9356
卷号	125 期号:7
英文摘要	The Hispar Glacier is a useful site for studying surge mechanisms. Prior to this study, only two-dimensional (2-D) flow velocities having low temporal resolution were available for this glacier, providing inadequate information about its surge evolution. In this study, 139 synthetic aperture radar (SAR) images from Sentinel-1A were used to obtain 3-D flow velocity time series for the Hispar Glacier during the recent surge (2014-2016). The 3-D flow velocities were sampled at an interval of 11 days, which is much greater than in previous studies. Besides, the Shuttle Radar Topography Mission (SRTM) digital elevation model (DEM) and two TanDEM-X images were used to determine glacier thickness changes prior to and following the recent surge. Combining the results and geomorphologic features, we deduced that the recent surge was because of saturated basal water pressure in the Yutmaru tributary. The mass from the Yutmaru tributary squeezed into the trunk and rapidly flowed downslope along the northern margin, generating strong normal pressure to the trunk mass. Pushed by the Yutmaru tributary, the trunk began to surge in September 2014. The flow velocity reached a first peak in May 2015 and then decreased in October 2015, as part of the basal meltwater ran off. However, basal meltwater accumulated again during the following 4 months, and correspondingly, the trunk accelerated again after October 2015. Finally, as kinetic energy was released and resisting force increased, the trunk became almost stagnant in August 2016. The surge mass was blocked downstream in the trunk by the mass transferred from the Kunyang tributary, and consequently, the glacier did not advance.
关键词	DIGITAL ELEVATION MODELS TANDEM-X BRIEF COMMUNICATION VARIEGATED GLACIER GROUND DEFORMATION PENETRATION DEPTH MASS CHANGE DATA SETS REGION LAKE
英文关键词	Hispar Glacier; glacier surge; SAR; 3-D flow velocity; thickness change
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000577118900015
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259733
推荐引用方式 GB/T 7714	Guo, Lei,Li, Jia,Li, Zhi-wei,et al. The Surge of the Hispar Glacier, Central Karakoram: SAR 3-D Flow Velocity Time Series and Thickness Changes[J]. 中国科学院青藏高原研究所,2020,125(7).
APA	Guo, Lei.,Li, Jia.,Li, Zhi-wei.,Wu, Li-xin.,Li, Xin.,...&Li, Zhong-qin.(2020).The Surge of the Hispar Glacier, Central Karakoram: SAR 3-D Flow Velocity Time Series and Thickness Changes.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(7).
MLA	Guo, Lei,et al."The Surge of the Hispar Glacier, Central Karakoram: SAR 3-D Flow Velocity Time Series and Thickness Changes".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.7(2020).