Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea
The measurement of ongoing ice-mass loss and associated melt water contribution to sea-level change from regions such as West Antarctica is dependent on a combination of remote sensing methods. A key method, the measurement of changes in Earth's gravity via the GRACE satellite mission, requires...
Published in: | Geophysical Journal International |
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Online Access: | https://eprints.lancs.ac.uk/id/eprint/128841/ https://doi.org/10.1093/gji/ggv327 |
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ftulancaster:oai:eprints.lancs.ac.uk:128841 2023-08-27T04:06:15+02:00 Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea Wolstencroft, Martin King, Matt A. Whitehouse, Pippa L. Bentley, Michael J. Nield, Grace A. King, Edward C. McMillan, Malcolm Shepherd, Andrew Barletta, Valentina Bordoni, Andrea Riva, Riccardo E.M. Didova, Olga Gunter, Brian C. 2015-10-01 https://eprints.lancs.ac.uk/id/eprint/128841/ https://doi.org/10.1093/gji/ggv327 unknown Wolstencroft, Martin and King, Matt A. and Whitehouse, Pippa L. and Bentley, Michael J. and Nield, Grace A. and King, Edward C. and McMillan, Malcolm and Shepherd, Andrew and Barletta, Valentina and Bordoni, Andrea and Riva, Riccardo E.M. and Didova, Olga and Gunter, Brian C. (2015) Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea. Geophysical Journal International, 203 (1). pp. 737-754. ISSN 0956-540X Journal Article PeerReviewed 2015 ftulancaster https://doi.org/10.1093/gji/ggv327 2023-08-03T22:34:21Z The measurement of ongoing ice-mass loss and associated melt water contribution to sea-level change from regions such as West Antarctica is dependent on a combination of remote sensing methods. A key method, the measurement of changes in Earth's gravity via the GRACE satellite mission, requires a potentially large correction to account for the isostatic response of the solid Earth to ice-load changes since the Last Glacial Maximum. In this study, we combine glacial isostatic adjustment modelling with a new GPS dataset of solid Earth deformation for the southern Antarctic Peninsula to test the current understanding of ice history in this region. A sufficiently complete history of past ice-load change is required for glacial isostatic adjustment models to accurately predict the spatial variation of ongoing solid Earth deformation, once the independently-constrained effects of present-day ice mass loss have been accounted for. Comparisons between the GPS data and glacial isostatic adjustment model predictions reveal a substantial misfit. The misfit is localized on the southwestern Weddell Sea, where current ice models under-predict uplift rates by approximately 2 mm yr-1. This under-prediction suggests that either the retreat of the ice sheet grounding line in this region occurred significantly later in the Holocene than currently assumed, or that the region previously hosted more ice than currently assumed. This finding demonstrates the need for further fieldwork to obtain direct constraints on the timing of Holocene grounding line retreat in the southwestern Weddell Sea and that GRACE estimates of ice sheet mass balance will be unreliable in this region until this is resolved. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Palmer Land Weddell Sea West Antarctica Lancaster University: Lancaster Eprints Antarctic Antarctic Peninsula Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) Weddell Weddell Sea West Antarctica Geophysical Journal International 203 1 737 754 |
institution |
Open Polar |
collection |
Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
unknown |
description |
The measurement of ongoing ice-mass loss and associated melt water contribution to sea-level change from regions such as West Antarctica is dependent on a combination of remote sensing methods. A key method, the measurement of changes in Earth's gravity via the GRACE satellite mission, requires a potentially large correction to account for the isostatic response of the solid Earth to ice-load changes since the Last Glacial Maximum. In this study, we combine glacial isostatic adjustment modelling with a new GPS dataset of solid Earth deformation for the southern Antarctic Peninsula to test the current understanding of ice history in this region. A sufficiently complete history of past ice-load change is required for glacial isostatic adjustment models to accurately predict the spatial variation of ongoing solid Earth deformation, once the independently-constrained effects of present-day ice mass loss have been accounted for. Comparisons between the GPS data and glacial isostatic adjustment model predictions reveal a substantial misfit. The misfit is localized on the southwestern Weddell Sea, where current ice models under-predict uplift rates by approximately 2 mm yr-1. This under-prediction suggests that either the retreat of the ice sheet grounding line in this region occurred significantly later in the Holocene than currently assumed, or that the region previously hosted more ice than currently assumed. This finding demonstrates the need for further fieldwork to obtain direct constraints on the timing of Holocene grounding line retreat in the southwestern Weddell Sea and that GRACE estimates of ice sheet mass balance will be unreliable in this region until this is resolved. |
format |
Article in Journal/Newspaper |
author |
Wolstencroft, Martin King, Matt A. Whitehouse, Pippa L. Bentley, Michael J. Nield, Grace A. King, Edward C. McMillan, Malcolm Shepherd, Andrew Barletta, Valentina Bordoni, Andrea Riva, Riccardo E.M. Didova, Olga Gunter, Brian C. |
spellingShingle |
Wolstencroft, Martin King, Matt A. Whitehouse, Pippa L. Bentley, Michael J. Nield, Grace A. King, Edward C. McMillan, Malcolm Shepherd, Andrew Barletta, Valentina Bordoni, Andrea Riva, Riccardo E.M. Didova, Olga Gunter, Brian C. Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea |
author_facet |
Wolstencroft, Martin King, Matt A. Whitehouse, Pippa L. Bentley, Michael J. Nield, Grace A. King, Edward C. McMillan, Malcolm Shepherd, Andrew Barletta, Valentina Bordoni, Andrea Riva, Riccardo E.M. Didova, Olga Gunter, Brian C. |
author_sort |
Wolstencroft, Martin |
title |
Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea |
title_short |
Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea |
title_full |
Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea |
title_fullStr |
Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea |
title_full_unstemmed |
Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea |
title_sort |
uplift rates from a new high-density gps network in palmer land indicate significant late holocene ice loss in the southwestern weddell sea |
publishDate |
2015 |
url |
https://eprints.lancs.ac.uk/id/eprint/128841/ https://doi.org/10.1093/gji/ggv327 |
long_lat |
ENVELOPE(-65.000,-65.000,-71.500,-71.500) |
geographic |
Antarctic Antarctic Peninsula Palmer Land Weddell Weddell Sea West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Palmer Land Weddell Weddell Sea West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Palmer Land Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Palmer Land Weddell Sea West Antarctica |
op_relation |
Wolstencroft, Martin and King, Matt A. and Whitehouse, Pippa L. and Bentley, Michael J. and Nield, Grace A. and King, Edward C. and McMillan, Malcolm and Shepherd, Andrew and Barletta, Valentina and Bordoni, Andrea and Riva, Riccardo E.M. and Didova, Olga and Gunter, Brian C. (2015) Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea. Geophysical Journal International, 203 (1). pp. 737-754. ISSN 0956-540X |
op_doi |
https://doi.org/10.1093/gji/ggv327 |
container_title |
Geophysical Journal International |
container_volume |
203 |
container_issue |
1 |
container_start_page |
737 |
op_container_end_page |
754 |
_version_ |
1775347064242176000 |