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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ftunivutrecht:oai:dspace.library.uu.nl:1874/322215 2023-11-12T04:00:55+01:00 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, Michiel Urban, T. Marine and Atmospheric Research Sub Dynamics Meteorology 2014 image/pdf https://dspace.library.uu.nl/handle/1874/322215 en eng 1994-0416 https://dspace.library.uu.nl/handle/1874/322215 info:eu-repo/semantics/OpenAccess GRACE SATELLITE DATA GRAVITY-FIELD UPLIFT RATES MODEL BALANCE SHEET VARIABILITY GREENLAND ERROR OCEAN Article 2014 ftunivutrecht 2023-11-01T23:13:11Z 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. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet West Antarctica Utrecht University Repository Amundsen Sea Antarctic East Antarctica Greenland West Antarctica |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
GRACE SATELLITE DATA GRAVITY-FIELD UPLIFT RATES MODEL BALANCE SHEET VARIABILITY GREENLAND ERROR OCEAN |
spellingShingle |
GRACE SATELLITE DATA GRAVITY-FIELD UPLIFT RATES MODEL BALANCE SHEET VARIABILITY GREENLAND ERROR OCEAN Gunter, B. C. Didova, O. Riva, R. E. M. Ligtenberg, S. R. M. Lenaerts, J. T. M. King, M. A. van den Broeke, Michiel 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 |
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. |
author2 |
Marine and Atmospheric Research Sub Dynamics Meteorology |
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, Michiel 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, Michiel 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 |
https://dspace.library.uu.nl/handle/1874/322215 |
geographic |
Amundsen Sea Antarctic East Antarctica Greenland West Antarctica |
geographic_facet |
Amundsen Sea Antarctic East Antarctica Greenland West Antarctica |
genre |
Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet West Antarctica |
op_relation |
1994-0416 https://dspace.library.uu.nl/handle/1874/322215 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782329010766741504 |