Empirical Estimation of Present-Day Antarctic Glacial Isostatic Adjustment and Ice Mass Change
This study explores an approach that simultaneously estimates Antarctic mass balance and glacial isostatic adjustment (GIA) through the combination of satellite gravity and altimetry data sets. The results improve upon previous efforts by incorporating a firn densification model to account for firn...
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ftunivtexas:oai:repositories.lib.utexas.edu:2152/41140 2023-05-15T13:24:16+02:00 Empirical Estimation of Present-Day Antarctic Glacial Isostatic Adjustment and Ice Mass Change Gunter, B. C. Didova, O. Riva, R. E. M. Ligtenberg, S. R. M. Lenaerts, J. T. M. King, M. A. van den Broeke, M. R. Urban, T. Urban, T. 2014-04 application/pdf http://hdl.handle.net/2152/41140 https://doi.org/10.15781/T23X83M90 https://doi.org/10.5194/tc-8-743-2014 English eng Cryosphere doi:10.15781/T23X83M90 Gunter, B. C., O. Didova, R. E. M. Riva, S. R. M. Ligtenberg, J. T. M. Lenaerts, M. A. King, M. R. Van den Broeke, and T. Urban. "Empirical estimation of present-day Antarctic glacial isostatic adjustment and ice mass change." The Cryosphere 8, no. 2 (Apr., 2014): 743-760. 1994-0416 http://hdl.handle.net/2152/41140 doi:10.5194/tc-8-743-2014 Administrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University. Open grace satellite data gravity-field uplift rates model balance sheet variability greenland error ocean geography physical geosciences multidisciplinary Article 2014 ftunivtexas https://doi.org/10.15781/T23X83M90 https://doi.org/10.5194/tc-8-743-2014 2020-12-23T22:11:34Z This study explores an approach that simultaneously estimates Antarctic mass balance and glacial isostatic adjustment (GIA) through the combination of satellite gravity and altimetry data sets. The results improve upon previous efforts by incorporating a firn densification model to account for firn compaction and surface processes as well as reprocessed data sets over a slightly longer period of time. A range of different Gravity Recovery and Climate Experiment (GRACE) gravity models were evaluated and a new Ice, Cloud, and Land Elevation Satellite (ICESat) surface height trend map computed using an overlapping footprint approach. When the GIA models created from the combination approach were compared to in situ GPS ground station displacements, the vertical rates estimated showed consistently better agreement than recent conventional GIA models. The new empirically derived GIA rates suggest the presence of strong uplift in the Amundsen Sea sector in West Antarctica (WA) and the Philippi/Denman sectors, as well as subsidence in large parts of East Antarctica (EA). The total GIA-related mass change estimates for the entire Antarctic ice sheet ranged from 53 to 103 Gt yr(-1), depending on the GRACE solution used, with an estimated uncertainty of +/- 40 Gt yr(-1). Over the time frame February 2003-October 2009, the corresponding ice mass change showed an average value of -100 +/- 44 Gt yr(-1) (EA: 5 +/- 38, WA: -105 +/- 22), consistent with other recent estimates in the literature, with regional mass loss mostly concentrated in WA. The refined approach presented in this study shows the contribution that such data combinations can make towards improving estimates of present-day GIA and ice mass change, particularly with respect to determining more reliable uncertainties. Funding Agency Grant Number Division for Earth and Life Sciences (ALW) New Netherlands Polar Programme (NNPP) of the Netherlands Organization for Scientific Research (NWO) Australian Research Council FT110100207 Center for Space Research Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet The Cryosphere West Antarctica The University of Texas at Austin: Texas ScholarWorks Antarctic East Antarctica West Antarctica Amundsen Sea Greenland |
institution |
Open Polar |
collection |
The University of Texas at Austin: Texas ScholarWorks |
op_collection_id |
ftunivtexas |
language |
English |
topic |
grace satellite data gravity-field uplift rates model balance sheet variability greenland error ocean geography physical geosciences multidisciplinary |
spellingShingle |
grace satellite data gravity-field uplift rates model balance sheet variability greenland error ocean geography physical geosciences multidisciplinary Gunter, B. C. Didova, O. Riva, R. E. M. Ligtenberg, S. R. M. Lenaerts, J. T. M. King, M. A. van den Broeke, M. R. Urban, T. Empirical Estimation of Present-Day Antarctic Glacial Isostatic Adjustment and Ice Mass Change |
topic_facet |
grace satellite data gravity-field uplift rates model balance sheet variability greenland error ocean geography physical geosciences multidisciplinary |
description |
This study explores an approach that simultaneously estimates Antarctic mass balance and glacial isostatic adjustment (GIA) through the combination of satellite gravity and altimetry data sets. The results improve upon previous efforts by incorporating a firn densification model to account for firn compaction and surface processes as well as reprocessed data sets over a slightly longer period of time. A range of different Gravity Recovery and Climate Experiment (GRACE) gravity models were evaluated and a new Ice, Cloud, and Land Elevation Satellite (ICESat) surface height trend map computed using an overlapping footprint approach. When the GIA models created from the combination approach were compared to in situ GPS ground station displacements, the vertical rates estimated showed consistently better agreement than recent conventional GIA models. The new empirically derived GIA rates suggest the presence of strong uplift in the Amundsen Sea sector in West Antarctica (WA) and the Philippi/Denman sectors, as well as subsidence in large parts of East Antarctica (EA). The total GIA-related mass change estimates for the entire Antarctic ice sheet ranged from 53 to 103 Gt yr(-1), depending on the GRACE solution used, with an estimated uncertainty of +/- 40 Gt yr(-1). Over the time frame February 2003-October 2009, the corresponding ice mass change showed an average value of -100 +/- 44 Gt yr(-1) (EA: 5 +/- 38, WA: -105 +/- 22), consistent with other recent estimates in the literature, with regional mass loss mostly concentrated in WA. The refined approach presented in this study shows the contribution that such data combinations can make towards improving estimates of present-day GIA and ice mass change, particularly with respect to determining more reliable uncertainties. Funding Agency Grant Number Division for Earth and Life Sciences (ALW) New Netherlands Polar Programme (NNPP) of the Netherlands Organization for Scientific Research (NWO) Australian Research Council FT110100207 Center for Space Research |
author2 |
Urban, T. |
format |
Article in Journal/Newspaper |
author |
Gunter, B. C. Didova, O. Riva, R. E. M. Ligtenberg, S. R. M. Lenaerts, J. T. M. King, M. A. van den Broeke, M. R. Urban, T. |
author_facet |
Gunter, B. C. Didova, O. Riva, R. E. M. Ligtenberg, S. R. M. Lenaerts, J. T. M. King, M. A. van den Broeke, M. R. Urban, T. |
author_sort |
Gunter, B. C. |
title |
Empirical Estimation of Present-Day Antarctic Glacial Isostatic Adjustment and Ice Mass Change |
title_short |
Empirical Estimation of Present-Day Antarctic Glacial Isostatic Adjustment and Ice Mass Change |
title_full |
Empirical Estimation of Present-Day Antarctic Glacial Isostatic Adjustment and Ice Mass Change |
title_fullStr |
Empirical Estimation of Present-Day Antarctic Glacial Isostatic Adjustment and Ice Mass Change |
title_full_unstemmed |
Empirical Estimation of Present-Day Antarctic Glacial Isostatic Adjustment and Ice Mass Change |
title_sort |
empirical estimation of present-day antarctic glacial isostatic adjustment and ice mass change |
publishDate |
2014 |
url |
http://hdl.handle.net/2152/41140 https://doi.org/10.15781/T23X83M90 https://doi.org/10.5194/tc-8-743-2014 |
geographic |
Antarctic East Antarctica West Antarctica Amundsen Sea Greenland |
geographic_facet |
Antarctic East Antarctica West Antarctica Amundsen Sea Greenland |
genre |
Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet The Cryosphere West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet The Cryosphere West Antarctica |
op_relation |
Cryosphere doi:10.15781/T23X83M90 Gunter, B. C., O. Didova, R. E. M. Riva, S. R. M. Ligtenberg, J. T. M. Lenaerts, M. A. King, M. R. Van den Broeke, and T. Urban. "Empirical estimation of present-day Antarctic glacial isostatic adjustment and ice mass change." The Cryosphere 8, no. 2 (Apr., 2014): 743-760. 1994-0416 http://hdl.handle.net/2152/41140 doi:10.5194/tc-8-743-2014 |
op_rights |
Administrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University. Open |
op_doi |
https://doi.org/10.15781/T23X83M90 https://doi.org/10.5194/tc-8-743-2014 |
_version_ |
1766378453222817792 |