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  • 1
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    Sentinel-1 InSAR measurements of surface elevation changes over yedoma uplands on Sobo-Sise Island, Lena Delta (2018)
    Laboratoire EDYTEM - UMR5204, Université Savoie Mont Blanc, Bâtiment «Pôle Montagne»
    In:  EPIC35th European Conference on Permafrost, Book of Abstracts, Chamonix Mont-Blanc, France, 2018-06-23-2018-07-01Le Bourget du Lac cedex, France, Laboratoire EDYTEM - UMR5204, Université Savoie Mont Blanc, Bâtiment «Pôle Montagne», 1055 p.
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    Publication Date: 2018-07-15
    Description: Yedoma is vulnerable to thawing and degradation under climate warming, which can result in lowering of surface elevations due to thaw subsidence. Quantitative knowledge about elevation changes can help us better understand the freeze-thaw processes of the active layer and yedoma deposits. In this study, we utilize C-band Sentinel-1 InSAR measurements, characterized by frequent sampling, to study the elevation changes over ice-rich yedoma uplands on Sobo-Sise Island, Lena Delta. We observe significant seasonal thaw subsidence during summer months and inter-annual elevation changes from 2016 to 2017. Here, we demonstrate the capability of Sentinel-1 to estimate elevation changes over yedoma uplands. We observe interesting patterns of stronger seasonal thaw subsidence on elevated flat yedoma uplands when compared to surrounding yedoma slopes. Inter-annual analyses from 2016 to 2017 revealed mostly positive surface elevation changes that might be caused by delayed thaw seasonal progression associated with mean annual air temperature fluctuations.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev , info:eu-repo/semantics/conferenceObject
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  • 2
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    Thermokarst lake monitoring on the Bykovsky Peninsula using high-resolution remote sensing data (2018)
    Laboratoire EDYTEM - UMR5204, Université Savoie Mont Blanc, Bâtiment «Pôle Montagne»
    In:  EPIC35th European Conference on Permafrost, Book of Abstracts, Chamonix Mont-Blanc, France, 2018-06-23-2018-07-01Le Bourget du Lac cedex, France, Laboratoire EDYTEM - UMR5204, Université Savoie Mont Blanc, Bâtiment «Pôle Montagne»
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    Publication Date: 2018-07-15
    Description: Thermokarst lakes are a characteristic element of arctic permafrost regions and an indicator for their rapid landscape changes. Assessing their dynamics contributes to the understanding of driving processes of change, to the evaluation of impacts on landscape characteristics as well as to the estimation of the impact on the permafrost-related carbon budget. Monitoring thermokarst lake dynamics on the Bykovsky Peninsula, consisting of ice-rich Yedoma deposits, using high resolution remote sensing imagery from 1951 to 2016, revealed a long-term tendency towards lake drainage. Approximately 17% of the 1951 lake area was lost due to coastal erosion or the development of drainage networks. In parallel, coastal erosion driven land loss amounts to 2.3% of the peninsula. We find process interconnections between coastal erosion and lake change, as well as lake change dependency on land elevation in a developed alas-yedoma thermokarst relief.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev , info:eu-repo/semantics/conferenceObject
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  • 3
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    Past and present thermokarst lake dynamics in the Yedoma Ice Complex region of North-Eastern Yakutia (2018)
    Laboratoire EDYTEM - UMR5204, Université Savoie Mont Blanc, Bâtiment «Pôle Montagne»
    In:  EPIC35th European Conference on Permafrost, Book of Abstracts, Chamonix Mont-Blanc, France, 2018-06-23-2018-07-01Le Bourget du Lac cedex, France, Laboratoire EDYTEM - UMR5204, Université Savoie Mont Blanc, Bâtiment «Pôle Montagne»
    Details
    Publication Date: 2018-07-15
    Description: Thermokarst lakes are typical components of the yedoma-alas dominated relief in the coastal lowlands of North- Eastern Yakutia and formed as a result of thawing Late Pleistocene ice-rich Yedoma Ice Complex (IC) deposits. The aim of our study is to estimate thermokarst lake area changes from the early Holocene onwards based on RS data. The decrease of thermokarst lake area from the early Holocene, taking into account total alas depression areas, is as much as 81-83 %. Modern climate warming has led to a general trend of thermokarst lake area decrease. Lake drainage occurs mostly on elevated sites with high Yedoma IC fraction while lake area increase is typical for low-lying areas with a small Yedoma IC fraction. The area increase of thermokarst ponds on flat, boggy yedoma surfaces indicates ice wedge degradation in response to rising summer air temperatures and precipitation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev , info:eu-repo/semantics/conferenceObject
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  • 4
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    Repeat terrestrial LiDAR for permafrost thaw subsidence change detection in North Alaska (2018)
    Laboratoire EDYTEM - UMR5204, Université Savoie Mont Blanc, Bâtiment «Pôle Montagne»
    In:  EPIC35th European Conference on Permafrost, Book of Abstracts, Chamonix Mont-Blanc, France, 2018-06-23-2018-07-01Le Bourget du Lac cedex, France, Laboratoire EDYTEM - UMR5204, Université Savoie Mont Blanc, Bâtiment «Pôle Montagne», 575 p.
    Details
    Publication Date: 2018-07-15
    Description: The distinguishing feature of permafrost in the Arctic is the presence of a large amount of ice below the earth surface. Thermal degradation and subsequent destabilization of ground ice rich terrain cause thaw subsidence. Because these phenomena are hard to detect, they have received not much attention, despite their potentially global significance through the permafrost carbon feedback and implications for active layer thickness monitoring. Clearly, however, detailed local inventories are required to calibrate regional targeted long and short-term assessments for measuring surface deformation due to permafrost thaw. We analyze time series of repeat terrestrial laser scanning (rLiDAR) for quantification of land surface lowering on a tundra upland in the Teshekpuk Lake Special Area on Alaska´s North Slope. Here, considerable negative surface elevation changes have been detected over two years from 2015 to 2017. Spatial patterns of land elevation changes indicate that ice wedge polygon troughs are particularly prone to subsidence. This highlights the vulnerability of arctic tundra lowlands with ice-rich permafrost close to the surface.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev , info:eu-repo/semantics/conferenceObject
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