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Sentinel-1 InSAR Measurements of Elevation Changes over Yedoma Uplands on Sobo-Sise Island, Lena Delta

  • Yedoma-extremely ice-rich permafrost with massive ice wedges formed during the Late Pleistocene-is vulnerable to thawing and degradation under climate warming. Thawing of ice-rich Yedoma results in lowering of surface elevations. Quantitative knowledge about surface elevation changes helps us to understand the freeze-thaw processes of the active layer and the potential degradation of Yedoma deposits. In this study, we use C-band Sentinel-1 InSAR measurements to map the elevation changes over ice-rich Yedoma uplands on Sobo-Sise Island, Lena Delta with frequent revisit observations (as short as six or 12 days). We observe significant seasonal thaw subsidence during summer months and heterogeneous inter-annual elevation changes from 2016-17. We also observe interesting patterns of stronger seasonal thaw subsidence on elevated flat Yedoma uplands by comparing to the surrounding Yedoma slopes. Inter-annual analyses from 2016-17 suggest that our observed positive surface elevation changes are likely caused by the delayed progression of theYedoma-extremely ice-rich permafrost with massive ice wedges formed during the Late Pleistocene-is vulnerable to thawing and degradation under climate warming. Thawing of ice-rich Yedoma results in lowering of surface elevations. Quantitative knowledge about surface elevation changes helps us to understand the freeze-thaw processes of the active layer and the potential degradation of Yedoma deposits. In this study, we use C-band Sentinel-1 InSAR measurements to map the elevation changes over ice-rich Yedoma uplands on Sobo-Sise Island, Lena Delta with frequent revisit observations (as short as six or 12 days). We observe significant seasonal thaw subsidence during summer months and heterogeneous inter-annual elevation changes from 2016-17. We also observe interesting patterns of stronger seasonal thaw subsidence on elevated flat Yedoma uplands by comparing to the surrounding Yedoma slopes. Inter-annual analyses from 2016-17 suggest that our observed positive surface elevation changes are likely caused by the delayed progression of the thaw season in 2017, associated with mean annual air temperature fluctuations.show moreshow less

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Author details:Jie ChenORCiD, Frank GüntherORCiD, Guido GrosseORCiDGND, Lin LiuORCiD, Hui Lin
DOI:https://doi.org/10.3390/rs10071152
ISSN:2072-4292
Title of parent work (English):Remote sensing
Publisher:MDPI
Place of publishing:Basel
Publication type:Article
Language:English
Date of first publication:2018/07/21
Publication year:2018
Release date:2021/11/12
Tag:Sentinel-1 InSAR; Sobo-Sise Island; Yedoma uplands; active layer; permafrost thaw subsidence; summer heave
Volume:10
Issue:7
Number of pages:16
Funding institution:National Key Basic Research Program of ChinaNational Basic Research Program of China [2015CB954103]; Hong Kong Research Grants CouncilHong Kong Research Grants Council [CUHK14233016, CUHK24300414, G-CUHK403/15]; DAADDeutscher Akademischer Austausch Dienst (DAAD) [57216164]; ERC PETA-CARB [338335]; ESA GlobPermafrost
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät
DDC classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
License (German):License LogoCC-BY - Namensnennung 4.0 International
External remark:Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam :[Mathematisch-Naturwissenschaftliche Reihe]; [690]
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