DOI: 10.5194/tc-14-1875-2020
论文题名: Global Positioning System interferometric reflectometry (GPS-IR) measurements of ground surface elevation changes in permafrost areas in northern Canada
作者: Zhang J. ; Liu L. ; Hu Y.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 6 起始页码: 1875
结束页码: 1888
语种: 英语
英文关键词: frozen ground
; GPS
; measurement method
; Northern Hemisphere
; permafrost
; reflectometry
; spatiotemporal analysis
; Alaska
; Baker Lake
; Barrow
; Canada
; Cornwallis Island
; Iqaluit
; Northwest Territories
; Nunavut
; Queen Elizabeth Islands
; Resolute Bay
; United States
英文摘要: pGlobal Positioning System interferometric reflectometry (GPS-IR) is a relatively new technique which uses reflected GPS signals to measure surface elevation changes to study frozen-ground dynamics. At present, more than 200 GPS stations are operating continuously in the Northern Hemisphere permafrost areas, which were originally designed and maintained for tectonic and ionospheric studies. However, only one site in Utqiaġvik, Alaska (formerly Barrow), was assessed to be usable for studying permafrost by GPS-IR. Moreover, GPS-IR has high requirements on the ground surface condition, which needs to be open, flat, and homogeneous. In this study, we screen three major GPS networks in Canada and identify 12 out of 38 stations located in permafrost areas as useful ones where reliable GPS-IR measurements can be obtained. We focus on the five Canadian Active Control System stations and obtain their daily GPS-IR surface elevation changes. We find that the ground surface subsided in Alert, Resolute Bay, and Repulse Bay respectively by span classCombining double low line"inline-formula"0.61±0.04/span cm yrspan classCombining double low line"inline-formula"-1/span (2012-2018), span classCombining double low line"inline-formula"0.70±0.02/span cm yrspan classCombining double low line"inline-formula"-1/span (2003-2014), and span classCombining double low line"inline-formula"0.26±0.05/span cm yrspan classCombining double low line"inline-formula"-1/span (2014-2019). At the other two sites of Baker Lake and Iqaluit, the trends are not statistically significant. The linear trends of deformation were negatively correlated with those of thaw indices in Alert, Resolute Bay, and Repulse Bay. Furthermore, in Resolute Bay, we also find that the end-of-thaw elevations during 2003-2012 were highly negatively correlated with the square root of thaw indices. This study is the first one using multiple GPS stations to study permafrost by GPS-IR. It highlights the multiple useful GPS stations in northern Canada, offering multi-year, continuous, and daily GPS-IR surface deformation, which provides new insights into frozen-ground dynamics at various temporal scales and across a broad region./p. © 2020 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164641
Appears in Collections: 气候变化与战略
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作者单位: Earth System Science Programme, Faculty of Science, Chinese University of Hong Kong, Hong Kong, Hong Kong; College of Geology Engineering and Geomatics, Chang'an University, Xian, 710054, China
Recommended Citation:
Zhang J.,Liu L.,Hu Y.. Global Positioning System interferometric reflectometry (GPS-IR) measurements of ground surface elevation changes in permafrost areas in northern Canada[J]. Cryosphere,2020-01-01,14(6)