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Synergistic Use of Single-Pass Interferometry and Radar Altimetry to Measure Mass Loss of NEGIS Outlet Glaciers between 2011 and 2014

Krieger, Lukas and Strößenreuther, Undine and Helm, Veit and Floricioiu, Dana and Horwath, Martin (2020) Synergistic Use of Single-Pass Interferometry and Radar Altimetry to Measure Mass Loss of NEGIS Outlet Glaciers between 2011 and 2014. Remote Sensing, 12 (6), 996_1-996_24. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs12060996. ISSN 2072-4292.

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Official URL: https://www.mdpi.com/2072-4292/12/6/996

Abstract

Mass balances of individual glaciers on ice sheets have been previously reported by forming a mass budget of discharged ice and modelled ice sheet surface mass balance or a complementary method which measures volume changes over the glaciated area that are subsequently converted to glacier mass change. On ice sheets, volume changes have been measured predominantly with radar and laser altimeters but InSAR DEM differencing has also been applied on smaller ice bodies. Here, we report for the first time on the synergistic use of volumetric measurements from the CryoSat-2 radar altimetry mission together with TanDEM-X DEM differencing and calculate the mass balance of the two major outlet glaciers of the Northeast Greenland Ice Stream: Zachariæ Isstrøm and Nioghalvfjerdsfjorden (79North). The glaciers lost 3.59±1.15 G t a-1 and 1.01±0.95 G t a-1 , respectively, between January 2011 and January 2014. Additionally, there has been substantial sub-aqueous mass loss on Zachariæ Isstrøm of more than 11 G t a-1 . We attribute the mass changes on both glaciers to dynamic downwasting. The presented methodology now permits using TanDEM-X bistatic InSAR data in the context of geodetic mass balance investigations for large ice sheet outlet glaciers. In the future, this will allow monitoring the mass changes of dynamic outlet glaciers with high spatial resolution while the superior vertical accuracy of CryoSat-2 can be used for the vast accumulation zones in the ice sheet interior.

Item URL in elib:https://elib.dlr.de/134492/
Document Type:Article
Title:Synergistic Use of Single-Pass Interferometry and Radar Altimetry to Measure Mass Loss of NEGIS Outlet Glaciers between 2011 and 2014
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Krieger, Lukaslukas.krieger (at) dlr.dehttps://orcid.org/0000-0002-2464-3102
Strößenreuther, Undineundine.stroessenreuther (at) tu-dresden.dehttps://orcid.org/0000-0002-7492-0948
Helm, VeitVeit.Helm (at) awi.dehttps://orcid.org/0000-0001-7788-9328
Floricioiu, DanaDana.Floricioiu (at) dlr.dehttps://orcid.org/0000-0002-1647-7191
Horwath, MartinMartin.Horwath (at) tu-dresden.dehttps://orcid.org/0000-0001-5797-244X
Date:2020
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:12
DOI :10.3390/rs12060996
Page Range:996_1-996_24
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:ice sheet; greenland; mass balance; TanDEM-X; CryoSat-2; NEGIS; Zachariæ Isstrøm and Nioghalvfjerdsfjorden (79North)
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 - SAR methods
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Krieger, Lukas
Deposited On:26 Mar 2020 10:46
Last Modified:27 Mar 2020 10:57

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