Sentinel-1 InSAR measurements of surface elevation changes over yedoma uplands on Sobo-Sise Island, Lena Delta


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jiechen [ at ] link.cuhk.edu.hk

Abstract

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.



Item Type
Conference (Talk)
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Not peer-reviewed
Publication Status
Published
Event Details
5th European Conference on Permafrost, Book of Abstracts, 23 Jun 2018 - 01 Jul 2018, Chamonix Mont-Blanc, France.
Eprint ID
47575
Cite as
Chen, J. , Günther, F. , Grosse, G. , Liu, L. and Lin, H. (2018): Sentinel-1 InSAR measurements of surface elevation changes over yedoma uplands on Sobo-Sise Island, Lena Delta / P. Deline , X. Bodin and L. Ravanel (editors) , 5th European Conference on Permafrost, Book of Abstracts, Chamonix Mont-Blanc, France, 23 June 2018 - 1 July 2018 .


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