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Mass, volume and velocity of the Antarctic Ice Sheet: present-day changes and error effects

Groh, Andreas and Ewert, Heiko and Rosenau, Ralf and Fagiolini, Elisa and Gruber, Christian and Floricioiu, Dana and Abdel Jaber, Wael and Linow, Stefanie and Flechtner, Frank and Eineder, Michael and Dierking, Wolfgang and Dietrich, Reinhard (2014) Mass, volume and velocity of the Antarctic Ice Sheet: present-day changes and error effects. Surveys in Geophysics, 35 (6), pp. 1481-1505. Springer. DOI: 10.1007/s10712-014-9286-y ISSN 0169-3298

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Official URL: http://link.springer.com/article/10.1007/s10712-014-9286-y

Abstract

This study examines present-day changes of the Antarctic ice sheet (AIS) by means of different data sets. We make use of monthly gravity field solutions acquired by the Gravity Recovery and Climate Experiment (GRACE) to study mass changes of the AIS for a 10-year period. In addition to "standard" solutions of release 05, solutions based on radial base functions were used. Both solutions reveal an increased mass loss in recent years. For a 6-year period surface-height changes were inferred from laser altimetry data provided by the Ice, Cloud, and land Elevation Satellite (ICESat). The basin-scale volume trends were converted into mass changes and were compared with the GRACE estimates for the same period. Focussing on the Thwaites Glacier, Landsat optical imagery was utilised to determine ice-flow velocities for a period of more than two decades. This data set was extended by means of high-resolution synthetic aperture radar (SAR) data from the TerraSAR-X mission, revealing an accelerated ice flow of all parts of the glacier. ICESat data over the Thwaites Glacier were complemented by digital elevation models inferred from TanDEM-X data. This extended data set exhibits an increased surface lowering in recent times. Passive microwave remote sensing data prove the long-term stability of the accumulation rates in a low accumulation zone in East Antarctica over several decades. Finally, we discuss the main error sources of present-day mass-balance estimates: the glacial isostatic adjustment effect for GRACE as well as the biases between laser operational periods and the volume-mass conversion for ICESat.

Item URL in elib:https://elib.dlr.de/92553/
Document Type:Article
Title:Mass, volume and velocity of the Antarctic Ice Sheet: present-day changes and error effects
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Groh, Andreasandreas.groh (at) tu-dresden.deUNSPECIFIED
Ewert, HeikoInstitut fuer Planetare Geodaesie, TU DresdenUNSPECIFIED
Rosenau, RalfInstitut fuer Planetare Geodaesie, TU DresdenUNSPECIFIED
Fagiolini, ElisaUNSPECIFIEDUNSPECIFIED
Gruber, ChristianGFZ German Research Centre for GeosciencesUNSPECIFIED
Floricioiu, Danadana.floricioiu (at) dlr.deUNSPECIFIED
Abdel Jaber, Waelwael.abdeljaber (at) dlr.deUNSPECIFIED
Linow, StefanieClimate Sciences Division, Alfred Wegener Institute for Polar and Marine ResearchUNSPECIFIED
Flechtner, FrankGFZUNSPECIFIED
Eineder, Michaelmichael.eineder (at) dlr.deUNSPECIFIED
Dierking, WolfgangAWIUNSPECIFIED
Dietrich, ReinhardTU DresdenUNSPECIFIED
Date:9 March 2014
Journal or Publication Title:Surveys in Geophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:35
DOI :10.1007/s10712-014-9286-y
Page Range:pp. 1481-1505
Editors:
EditorsEmail
Rycroft, MichaelUNSPECIFIED
Publisher:Springer
ISSN:0169-3298
Status:Published
Keywords:Antarctic ice sheet, mass balance, ice velocity, accumulation
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 - Vorhaben hochauflösende Fernerkundungsverfahren
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Floricioiu, Dr. Dana
Deposited On:27 Nov 2014 11:27
Last Modified:06 Sep 2019 15:17

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