气候变化领域集成服务门户(CCPortal): Decadal changes of surface elevation over permafrost area estimated using reflected GPS signals

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DOI	10.5194/tc-12-477-2018
	Decadal changes of surface elevation over permafrost area estimated using reflected GPS signals
	Liu L.; Larson M.
发表日期	2018
ISSN	19940416
卷号	12 期号:2
英文摘要	Conventional benchmark-based survey and Global Positioning System (GPS) have been used to measure surface elevation changes over permafrost areas, usually once or a few times a year. Here we use reflected GPS signals to measure temporal changes of ground surface elevation due to dynamics of the active layer and near-surface permafrost. Applying the GPS interferometric reflectometry technique to the multipath signal-to-noise ratio data collected by a continuously operating GPS receiver mounted deep in permafrost in Barrow, Alaska, we can retrieve the vertical distance between the antenna and reflecting surface. Using this unique kind of observables, we obtain daily changes of surface elevation during July and August from 2004 to 2015. Our results show distinct temporal variations at three timescales: Regular thaw settlement within each summer, strong interannual variability that is characterized by a sub-decadal subsidence trend followed by a brief uplift trend, and a secular subsidence trend of 0.26±0.02 cm year-1 during 2004 and 2015. This method provides a new way to fully utilize data from continuously operating GPS sites in cold regions for studying dynamics of the frozen ground consistently and sustainably over a long time. © 2018 Author.
学科领域	active layer; benchmarking; cold region; decadal variation; frozen ground; GPS; interferometry; permafrost; reflectometry; signal-to-noise ratio; subsidence; temporal variation; uplift
语种	英语
scopus关键词	active layer; benchmarking; cold region; decadal variation; frozen ground; GPS; interferometry; permafrost; reflectometry; signal-to-noise ratio; subsidence; temporal variation; uplift
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119225
作者单位	Earth System Science Programme, Faculty of Science, Chinese University of Hong Kong, Hong Kong, Hong Kong; Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309, United States
推荐引用方式 GB/T 7714	Liu L.,Larson M.. Decadal changes of surface elevation over permafrost area estimated using reflected GPS signals[J],2018,12(2).
APA	Liu L.,&Larson M..(2018).Decadal changes of surface elevation over permafrost area estimated using reflected GPS signals.Cryosphere,12(2).
MLA	Liu L.,et al."Decadal changes of surface elevation over permafrost area estimated using reflected GPS signals".Cryosphere 12.2(2018).