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...
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Online Access: | https://eprints.whiterose.ac.uk/90944/ https://eprints.whiterose.ac.uk/90944/1/Wolstencroft_GJI_AP-GPS-uplift_2015.pdf https://doi.org/10.1093/gji/ggv327 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:90944 2023-05-15T13:55:00+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, M King, MA Whitehouse, PL Bentley, MJ Nield, GA King, EC McMillan, M Shepherd, A Barletta, V Bordoni, A Riva, REM Didova, O Gunter, BC 2015-10 text https://eprints.whiterose.ac.uk/90944/ https://eprints.whiterose.ac.uk/90944/1/Wolstencroft_GJI_AP-GPS-uplift_2015.pdf https://doi.org/10.1093/gji/ggv327 en eng Oxford University Press https://eprints.whiterose.ac.uk/90944/1/Wolstencroft_GJI_AP-GPS-uplift_2015.pdf Wolstencroft, M, King, MA, Whitehouse, PL et al. (10 more authors) (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). 737 - 754. ISSN 0956-540X cc_by_4 CC-BY Article NonPeerReviewed 2015 ftleedsuniv https://doi.org/10.1093/gji/ggv327 2023-01-30T21:36:10Z 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 White Rose Research Online (Universities of Leeds, Sheffield & York) Antarctic Antarctic Peninsula Weddell Sea West Antarctica Weddell Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) Geophysical Journal International 203 1 737 754 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
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, M King, MA Whitehouse, PL Bentley, MJ Nield, GA King, EC McMillan, M Shepherd, A Barletta, V Bordoni, A Riva, REM Didova, O Gunter, BC |
spellingShingle |
Wolstencroft, M King, MA Whitehouse, PL Bentley, MJ Nield, GA King, EC McMillan, M Shepherd, A Barletta, V Bordoni, A Riva, REM Didova, O Gunter, BC 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, M King, MA Whitehouse, PL Bentley, MJ Nield, GA King, EC McMillan, M Shepherd, A Barletta, V Bordoni, A Riva, REM Didova, O Gunter, BC |
author_sort |
Wolstencroft, M |
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 |
publisher |
Oxford University Press |
publishDate |
2015 |
url |
https://eprints.whiterose.ac.uk/90944/ https://eprints.whiterose.ac.uk/90944/1/Wolstencroft_GJI_AP-GPS-uplift_2015.pdf https://doi.org/10.1093/gji/ggv327 |
long_lat |
ENVELOPE(-65.000,-65.000,-71.500,-71.500) |
geographic |
Antarctic Antarctic Peninsula Weddell Sea West Antarctica Weddell Palmer Land |
geographic_facet |
Antarctic Antarctic Peninsula Weddell Sea West Antarctica Weddell Palmer Land |
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 |
https://eprints.whiterose.ac.uk/90944/1/Wolstencroft_GJI_AP-GPS-uplift_2015.pdf Wolstencroft, M, King, MA, Whitehouse, PL et al. (10 more authors) (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). 737 - 754. ISSN 0956-540X |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
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_ |
1766261219502587904 |