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Elevation changes of the Greenland ice sheet derived from multi-temporal TanDEM-X DEM data from 2010 to 2015

Wessel, Birgit and Leichtle, Tobias and Wohlfart, Christian and Abdullahi, Sahra and Kerkhoff, Silke and Roth, Achim (2017) Elevation changes of the Greenland ice sheet derived from multi-temporal TanDEM-X DEM data from 2010 to 2015. International Arctic Change Conference 2017, 11.-15.12.2017, Quebec, Kanada.

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In this presentation we analyze three digital elevation models (DEM) of Greenland produced with data recorded by the TanDEM-X (TerraSAR add-on for digital elevation measurement) mission. During the TanDEM-X mission several area-wide coverages of Greenland were acquired. From this data we produce three DEMs with distinct temporal coverage: one capturing the winter 2010/11, one containing the winter 2011/12 and one from the winter 2015/16. These DEMs possess a spatial resolution of 0.4 arc seconds (i.e. corresponding to 12 m) and are composed of around 3000 individual interferometric synthetic aperture radar (InSAR) DEM scenes each. X-Band SAR penetrates the snow and ice pack by several meters depending on the snow structures, the acquisition parameters, and the di-electric constant of the medium. Hence, the resulting SAR measurements do not represent the real surface but the elevation of the mean phase center of the backscattered signal. As a first step, all DEMs are vertically calibrated to achieve comparable heights. For the conducted iterative least-squares block adjustment, ICESat (Ice, Cloud, and land Elevation Satellite) elevation measurements are used as ground control points (GCPs) on the outer coastal regions where rock and surface scattering predominates (REF). For the inland of Greenland, tie-point chips within the overlapping areas of the individual scenes are employed for block adjustment. In a second step, the spatio-temporal characteristics are analyzed in detail. We found that the inner main body of Greenland seems to be relatively stable within the observed time frame from 2010 to 2015. In contrast, several significant height change events (negative as well as positive) occur at the outlet glaciers. Based on this high-resolution DEM data set we can also monitor changes within the catchment areas and study the height changes towards the inland of Greenland. The penetration of X-band SAR shows significant influence on height measurements especially in these areas and must be considered for accurate quantification of elevation changes. In conclusion, we provide the first wall-to-wall and multi-temporal high resolution dataset of Greenland, which holds large potential for further climate and hydrology research in the arctic.

Item URL in elib:https://elib.dlr.de/122552/
Document Type:Conference or Workshop Item (Speech)
Title:Elevation changes of the Greenland ice sheet derived from multi-temporal TanDEM-X DEM data from 2010 to 2015
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wessel, BirgitBirgit.Wessel (at) dlr.dehttps://orcid.org/0000-0002-8673-2485
Leichtle, Tobiastobias.leichtle (at) slu-web.deUNSPECIFIED
Wohlfart, ChristianChristian.Wohlfart (at) dlr.deUNSPECIFIED
Abdullahi, SahraSahra.Abdullahi (at) dlr.deUNSPECIFIED
Kerkhoff, SilkeSilke.Kerkhoff (at) dlr.deUNSPECIFIED
Roth, AchimAchim.Roth (at) dlr.deUNSPECIFIED
Date:December 2017
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Greenland, TanDEM-X DEM, Global Change, SAR
Event Title:International Arctic Change Conference 2017
Event Location:Quebec, Kanada
Event Type:international Conference
Event Dates:11.-15.12.2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Projekt TanDEM-X, R - Remote sensing and geoscience
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface Dynamics
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Leichtle, Tobias
Deposited On:07 Nov 2018 11:00
Last Modified:07 Nov 2018 11:00

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