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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Oxford University Press
2015
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Online Access: | http://dro.dur.ac.uk/16341/ http://dro.dur.ac.uk/16341/1/16341.pdf https://doi.org/10.1093/gji/ggv327 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:16341 2023-05-15T13:59:22+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, M. A. Whitehouse, P. L. Bentley, M. J. Nield, G. A. King, E. C. McMillan, M. Shepherd, A. Barletta, V. Bordoni, A. Riva, R. E. M. Didova, O. Gunter, B. C. 2015-10-01 application/pdf http://dro.dur.ac.uk/16341/ http://dro.dur.ac.uk/16341/1/16341.pdf https://doi.org/10.1093/gji/ggv327 unknown Oxford University Press dro:16341 issn:0956-540X issn: 1365-246X doi:10.1093/gji/ggv327 http://dro.dur.ac.uk/16341/ http://dx.doi.org/10.1093/gji/ggv327 http://dro.dur.ac.uk/16341/1/16341.pdf © The Authors 2015. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY Geophysical journal international, 2015, Vol.203(1), pp.737-754 [Peer Reviewed Journal] Sea level change Space geodetic surveys Global change from geodesy Glaciology Antarctica Article PeerReviewed 2015 ftunivdurham https://doi.org/10.1093/gji/ggv327 2020-05-28T22:33:11Z 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 Durham University: Durham Research Online 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 |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
topic |
Sea level change Space geodetic surveys Global change from geodesy Glaciology Antarctica |
spellingShingle |
Sea level change Space geodetic surveys Global change from geodesy Glaciology Antarctica Wolstencroft, M. King, M. A. Whitehouse, P. L. Bentley, M. J. Nield, G. A. King, E. C. McMillan, M. Shepherd, A. Barletta, V. Bordoni, A. Riva, R. E. M. Didova, O. Gunter, B. C. Uplift rates from a new high-density GPS network in Palmer Land indicate significant late Holocene ice loss in the southwestern Weddell Sea. |
topic_facet |
Sea level change Space geodetic surveys Global change from geodesy Glaciology Antarctica |
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, M. A. Whitehouse, P. L. Bentley, M. J. Nield, G. A. King, E. C. McMillan, M. Shepherd, A. Barletta, V. Bordoni, A. Riva, R. E. M. Didova, O. Gunter, B. C. |
author_facet |
Wolstencroft, M. King, M. A. Whitehouse, P. L. Bentley, M. J. Nield, G. A. King, E. C. McMillan, M. Shepherd, A. Barletta, V. Bordoni, A. Riva, R. E. M. Didova, O. Gunter, B. C. |
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 |
http://dro.dur.ac.uk/16341/ http://dro.dur.ac.uk/16341/1/16341.pdf 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_source |
Geophysical journal international, 2015, Vol.203(1), pp.737-754 [Peer Reviewed Journal] |
op_relation |
dro:16341 issn:0956-540X issn: 1365-246X doi:10.1093/gji/ggv327 http://dro.dur.ac.uk/16341/ http://dx.doi.org/10.1093/gji/ggv327 http://dro.dur.ac.uk/16341/1/16341.pdf |
op_rights |
© The Authors 2015. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
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 |
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1766267920998989824 |