Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica
Since the Last Glacial Maximum ∼20,000 years ago, the Antarctic Ice Sheet has undergone extensive changes, resulting in a much smaller present‐day configuration. Improving our understanding of basic physical processes that played important roles during that retreat is critical to providing more robu...
Published in: | Journal of Geophysical Research: Earth Surface |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2021
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/528207/ https://nora.nerc.ac.uk/id/eprint/528207/1/2020JF005827.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JF005827 |
id |
ftnerc:oai:nora.nerc.ac.uk:528207 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:528207 2023-05-15T13:23:56+02:00 Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica Johnson, Joanne S. Pollard, David Whitehouse, Pippa L. Roberts, Stephen J. Rood, Dylan H. Schaefer, Joerg M. 2021-06-11 text http://nora.nerc.ac.uk/id/eprint/528207/ https://nora.nerc.ac.uk/id/eprint/528207/1/2020JF005827.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JF005827 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/528207/1/2020JF005827.pdf Johnson, Joanne S. orcid:0000-0003-4537-4447 Pollard, David; Whitehouse, Pippa L.; Roberts, Stephen J. orcid:0000-0003-3407-9127 Rood, Dylan H.; Schaefer, Joerg M. 2021 Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica. Journal of Geophysical Research: Earth Surface, 126 (6), e2020JF005827. 20, pp. https://doi.org/10.1029/2020JF005827 <https://doi.org/10.1029/2020JF005827> cc_by_4 CC-BY Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1029/2020JF005827 2023-02-04T19:50:55Z Since the Last Glacial Maximum ∼20,000 years ago, the Antarctic Ice Sheet has undergone extensive changes, resulting in a much smaller present‐day configuration. Improving our understanding of basic physical processes that played important roles during that retreat is critical to providing more robust model projections of future retreat and sea‐level rise. Here, a limited‐area nested ice sheet model was applied to the last deglacial retreat of the West Antarctic Ice Sheet in the Amundsen Sea Embayment (ASE), at 5 km resolution. The ice sheet response to climate and sea‐level forcing was examined at two sites along the flowlines of Pine Island Glacier and Pope Glacier, close to the Hudson Mountains and Mount Murphy respectively, and the simulated responses compared with ice sheet thinning histories derived from glacial‐geological data. The sensitivity of results to selected model parameters was also assessed. The model simulations predict a broadly similar response to ocean forcing in both the central and eastern ASE, with an initial rapid phase of thinning followed by a slower phase to the modern configuration. Although there is a mismatch of up to 5,000 years between the timing of simulated and observed thinning, the modeling suggests that the upstream geological records of ice surface elevation change reflect a response to retreat near the grounding line. The model‐data mismatch could potentially be improved by accounting for regional variations in mantle viscosity, sea‐surface heights and basal sliding properties across the continental shelf. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Pine Island Pine Island Glacier Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Hudson Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Hudson Mountains ENVELOPE(-98.500,-98.500,-74.250,-74.250) Pope Glacier ENVELOPE(-111.500,-111.500,-75.250,-75.250) Mount Murphy ENVELOPE(-110.733,-110.733,-75.333,-75.333) Journal of Geophysical Research: Earth Surface 126 6 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Since the Last Glacial Maximum ∼20,000 years ago, the Antarctic Ice Sheet has undergone extensive changes, resulting in a much smaller present‐day configuration. Improving our understanding of basic physical processes that played important roles during that retreat is critical to providing more robust model projections of future retreat and sea‐level rise. Here, a limited‐area nested ice sheet model was applied to the last deglacial retreat of the West Antarctic Ice Sheet in the Amundsen Sea Embayment (ASE), at 5 km resolution. The ice sheet response to climate and sea‐level forcing was examined at two sites along the flowlines of Pine Island Glacier and Pope Glacier, close to the Hudson Mountains and Mount Murphy respectively, and the simulated responses compared with ice sheet thinning histories derived from glacial‐geological data. The sensitivity of results to selected model parameters was also assessed. The model simulations predict a broadly similar response to ocean forcing in both the central and eastern ASE, with an initial rapid phase of thinning followed by a slower phase to the modern configuration. Although there is a mismatch of up to 5,000 years between the timing of simulated and observed thinning, the modeling suggests that the upstream geological records of ice surface elevation change reflect a response to retreat near the grounding line. The model‐data mismatch could potentially be improved by accounting for regional variations in mantle viscosity, sea‐surface heights and basal sliding properties across the continental shelf. |
format |
Article in Journal/Newspaper |
author |
Johnson, Joanne S. Pollard, David Whitehouse, Pippa L. Roberts, Stephen J. Rood, Dylan H. Schaefer, Joerg M. |
spellingShingle |
Johnson, Joanne S. Pollard, David Whitehouse, Pippa L. Roberts, Stephen J. Rood, Dylan H. Schaefer, Joerg M. Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica |
author_facet |
Johnson, Joanne S. Pollard, David Whitehouse, Pippa L. Roberts, Stephen J. Rood, Dylan H. Schaefer, Joerg M. |
author_sort |
Johnson, Joanne S. |
title |
Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica |
title_short |
Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica |
title_full |
Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica |
title_fullStr |
Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica |
title_full_unstemmed |
Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica |
title_sort |
comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the amundsen sea sector of antarctica |
publisher |
American Geophysical Union |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/528207/ https://nora.nerc.ac.uk/id/eprint/528207/1/2020JF005827.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JF005827 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(-98.500,-98.500,-74.250,-74.250) ENVELOPE(-111.500,-111.500,-75.250,-75.250) ENVELOPE(-110.733,-110.733,-75.333,-75.333) |
geographic |
Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Hudson Pine Island Glacier Hudson Mountains Pope Glacier Mount Murphy |
geographic_facet |
Antarctic The Antarctic Amundsen Sea West Antarctic Ice Sheet Hudson Pine Island Glacier Hudson Mountains Pope Glacier Mount Murphy |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Pine Island Pine Island Glacier |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Pine Island Pine Island Glacier |
op_relation |
https://nora.nerc.ac.uk/id/eprint/528207/1/2020JF005827.pdf Johnson, Joanne S. orcid:0000-0003-4537-4447 Pollard, David; Whitehouse, Pippa L.; Roberts, Stephen J. orcid:0000-0003-3407-9127 Rood, Dylan H.; Schaefer, Joerg M. 2021 Comparing glacial‐geological evidence and model simulations of ice sheet change since the last glacial period in the Amundsen Sea sector of Antarctica. Journal of Geophysical Research: Earth Surface, 126 (6), e2020JF005827. 20, pp. https://doi.org/10.1029/2020JF005827 <https://doi.org/10.1029/2020JF005827> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2020JF005827 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
126 |
container_issue |
6 |
_version_ |
1766376388115300352 |