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Evolution of supraglacial lakes on the Greenland Ice sheet

Wendleder, Anna and Gnatzy, Gregor and Schmitt, Andreas and Abdullahi, Sahra (2021) Evolution of supraglacial lakes on the Greenland Ice sheet. EUSAR 2021, 29.03.2021 - 01.04.2021, Online Event.

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Polar Regions pass through dramatic changes caused by ongoing climate warming. In many areas, rapid glaciers surface velocity has been observed provoked by supraglacial lakes if their water is able to drain to the ground. This study analyses the evolution of supraglacial lakes on the western margin of Greenland near Kangerlussuaq based on a Sentinel-1 data time series from May to December 2017. Additionally, the TanDEM-X Digital Elevation Model is used for the determination of the altitude of the supraglacial lakes. The automatic detection of supraglacial lakes in SAR images is limited due to the very similar backscatter profile of water surfaces and wet glacier areas. Hence, we manually determined the lake boundaries and were able to date the onset, the maximum water level, and the drainage or freeze, respectively. We concluded that the time span between the onset and the maximal water level was two weeks for most of the lakes. Though, lakes above 1200 m a.s.l. freeze rather than draining out.

Item URL in elib:https://elib.dlr.de/141673/
Document Type:Conference or Workshop Item (Poster)
Title:Evolution of supraglacial lakes on the Greenland Ice sheet
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wendleder, AnnaUNSPECIFIEDhttps://orcid.org/0009-0005-1534-4732UNSPECIFIED
Abdullahi, SahraUNSPECIFIEDhttps://orcid.org/0009-0000-4328-2843UNSPECIFIED
Date:March 2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Sentinel-1, SAR, supraglacial lakes, backscsatter, Greenland Ice Sheet
Event Title:EUSAR 2021
Event Location:Online Event
Event Type:international Conference
Event Dates:29.03.2021 - 01.04.2021
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Remote Sensing and Geo Research
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface Dynamics
Deposited By: Wendleder, Anna
Deposited On:25 May 2021 09:26
Last Modified:29 Mar 2023 00:48

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