DOI: 10.5194/tc-14-1633-2020
论文题名: InSAR time series analysis of seasonal surface displacement dynamics on the Tibetan Plateau
作者: Reinosch E. ; Buckel J. ; Dong J. ; Gerke M. ; Baade J. ; Riedel B.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 5 起始页码: 1633
结束页码: 1650
语种: 英语
英文关键词: active layer
; air temperature
; climate change
; displacement
; freeze-thaw cycle
; frost heave
; interferometry
; moraine
; permafrost
; seasonal variation
; synthetic aperture radar
; time series analysis
; China
; Nam Co
; Qinghai-Xizang Plateau
; Xizang
英文摘要: Climate change and the associated rise in air temperature have affected the Tibetan Plateau to a significantly stronger degree than the global average over the past decades. This has caused deglaciation, increased precipitation and permafrost degradation. The latter in particular is associated with increased slope instability and an increase in masswasting processes, which pose a danger to infrastructure in the vicinity. Interferometric synthetic aperture radar (InSAR) analysis is well suited to study the displacement patterns driven by permafrost processes, as they are on the order of millimeters to decimeters. The Nyainqentanglha range on the Tibetan Plateau lacks high vegetation and features relatively thin snow cover in winter, allowing for continuous monitoring of those displacements throughout the year. The short revisit time of the Sentinel-1 constellation further reduces the risk of temporal decorrelation, making it possible to produce surface displacement models with good spatial coverage.We created three different surface displacement models to study heave and subsidence in the valleys, seasonally accelerated sliding and linear creep on the slopes. Flat regions at Nam Co are mostly stable on a multiannual scale but some experience subsidence. We observe a clear cycle of heave and subsidence in the valleys, where freezing of the active layer followed by subsequent thawing cause a vertical oscillation of the ground of up to a few centimeters, especially near streams and other water bodies. Most slopes of the area are unstable, with velocities of 8 to 17mmyr-1. During the summer months surface displacement velocities more than double on most unstable slopes due to freeze-thaw processes driven by higher temperatures and increased precipitation. Specific landforms, most of which have been identified as rock glaciers, protalus ramparts or frozen moraines, reach velocities of up to 18 cm yr-1. Their movement shows little seasonal variation but a linear pattern indicating that their displacement is predominantly gravity-driven. © 2020 MA Healthcare Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164566
Appears in Collections: 气候变化与战略
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作者单位: Institute of Geodesy and Photogrammetry, Technische Universität Braunschweig, Braunschweig, Germany; Institute of Geophysics and Extraterrestrial Physics, Technische Universität Braunschweig, Braunschweig, Germany; School of Remote Sensing and Information Engineering, Wuhan University, Wuhan, China; Department of Geography, Friedrich-Schiller-Universität Jena, Jena, Germany
Recommended Citation:
Reinosch E.,Buckel J.,Dong J.,et al. InSAR time series analysis of seasonal surface displacement dynamics on the Tibetan Plateau[J]. Cryosphere,2020-01-01,14(5)