Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance
Many ice-sheet reconstructions assume monotonic Holocene retreat for the West Antarctic Ice Sheet, but an increasing number of glaciological observations infer that some portions of the ice sheet may be readvancing, following retreat behind the present-day margin. A readvance in the Weddell Sea regi...
Published in: | Earth and Planetary Science Letters |
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Language: | English |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/503670/ https://nora.nerc.ac.uk/id/eprint/503670/1/1-s2.0-S0012821X14008000-main.pdf |
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ftnerc:oai:nora.nerc.ac.uk:503670 2023-05-15T13:48:08+02:00 Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance Bradley, Sarah L. Hindmarsh, Richard C.A. Whitehouse, Pippa L. Bentley, Michael J. King, Matt A. 2015-03-01 text http://nora.nerc.ac.uk/id/eprint/503670/ https://nora.nerc.ac.uk/id/eprint/503670/1/1-s2.0-S0012821X14008000-main.pdf en eng Elsevier https://nora.nerc.ac.uk/id/eprint/503670/1/1-s2.0-S0012821X14008000-main.pdf Bradley, Sarah L.; Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 Whitehouse, Pippa L.; Bentley, Michael J.; King, Matt A. 2015 Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance. Earth and Planetary Science Letters, 413. 79-89. https://doi.org/10.1016/j.epsl.2014.12.039 <https://doi.org/10.1016/j.epsl.2014.12.039> cc_by_nc_nd CC-BY-NC-ND Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1016/j.epsl.2014.12.039 2023-02-04T19:37:58Z Many ice-sheet reconstructions assume monotonic Holocene retreat for the West Antarctic Ice Sheet, but an increasing number of glaciological observations infer that some portions of the ice sheet may be readvancing, following retreat behind the present-day margin. A readvance in the Weddell Sea region can reconcile two outstanding problems: (i) the present-day widespread occurrence of seemingly stable ice streams grounded on beds that deepen inland; and (ii) the inability of models of glacial isostatic adjustment to match present-day uplift rates. By combining a suite of ice loading histories that include a readvance with a model of glacial isostatic adjustment we report substantial improvements to predictions of present-day uplift rates, including reconciling one problematic observation of land sinking. We suggest retreat behind present grounding lines occurred when the bed was lower, and isostatic recovery has since led to shallowing, ice sheet re-grounding and readvance. The paradoxical existence of grounding lines in apparently unstable configurations on reverse bed slopes may be resolved by invoking the process of unstable advance, in accordance with our load modelling. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Weddell Sea West Antarctic Ice Sheet Weddell Earth and Planetary Science Letters 413 79 89 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Many ice-sheet reconstructions assume monotonic Holocene retreat for the West Antarctic Ice Sheet, but an increasing number of glaciological observations infer that some portions of the ice sheet may be readvancing, following retreat behind the present-day margin. A readvance in the Weddell Sea region can reconcile two outstanding problems: (i) the present-day widespread occurrence of seemingly stable ice streams grounded on beds that deepen inland; and (ii) the inability of models of glacial isostatic adjustment to match present-day uplift rates. By combining a suite of ice loading histories that include a readvance with a model of glacial isostatic adjustment we report substantial improvements to predictions of present-day uplift rates, including reconciling one problematic observation of land sinking. We suggest retreat behind present grounding lines occurred when the bed was lower, and isostatic recovery has since led to shallowing, ice sheet re-grounding and readvance. The paradoxical existence of grounding lines in apparently unstable configurations on reverse bed slopes may be resolved by invoking the process of unstable advance, in accordance with our load modelling. |
format |
Article in Journal/Newspaper |
author |
Bradley, Sarah L. Hindmarsh, Richard C.A. Whitehouse, Pippa L. Bentley, Michael J. King, Matt A. |
spellingShingle |
Bradley, Sarah L. Hindmarsh, Richard C.A. Whitehouse, Pippa L. Bentley, Michael J. King, Matt A. Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance |
author_facet |
Bradley, Sarah L. Hindmarsh, Richard C.A. Whitehouse, Pippa L. Bentley, Michael J. King, Matt A. |
author_sort |
Bradley, Sarah L. |
title |
Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance |
title_short |
Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance |
title_full |
Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance |
title_fullStr |
Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance |
title_full_unstemmed |
Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance |
title_sort |
low post-glacial rebound rates in the weddell sea due to late holocene ice-sheet re-advance |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/503670/ https://nora.nerc.ac.uk/id/eprint/503670/1/1-s2.0-S0012821X14008000-main.pdf |
geographic |
Antarctic Weddell Sea West Antarctic Ice Sheet Weddell |
geographic_facet |
Antarctic Weddell Sea West Antarctic Ice Sheet Weddell |
genre |
Antarc* Antarctic Ice Sheet Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Sheet Weddell Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/503670/1/1-s2.0-S0012821X14008000-main.pdf Bradley, Sarah L.; Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 Whitehouse, Pippa L.; Bentley, Michael J.; King, Matt A. 2015 Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet re-advance. Earth and Planetary Science Letters, 413. 79-89. https://doi.org/10.1016/j.epsl.2014.12.039 <https://doi.org/10.1016/j.epsl.2014.12.039> |
op_rights |
cc_by_nc_nd |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.epsl.2014.12.039 |
container_title |
Earth and Planetary Science Letters |
container_volume |
413 |
container_start_page |
79 |
op_container_end_page |
89 |
_version_ |
1766248696745295872 |