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...
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ftdatacite:10.26208/z0m8-ez86 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, J.S. Pollard, D. Whitehouse, P.L. Roberts, S.J. Rood, D.H. Schaefer, J.M. 2020 https://dx.doi.org/10.26208/z0m8-ez86 http://www.datacommons.psu.edu/commonswizard/MetadataDisplay.aspx?Dataset=6253 unknown Penn State Data Commons dataset Dataset 2020 ftdatacite https://doi.org/10.26208/z0m8-ez86 2021-11-05T12:55:41Z 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 be improved by undertaking more-sophisticated regional bedrock/glacial isostatic adjustment modeling including regional variations in mantle viscosity, and spatially varying basal sliding properties on the continental shelf. Dataset Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Pine Island Pine Island Glacier DataCite Metadata Store (German National Library of Science and Technology) 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) |
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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 be improved by undertaking more-sophisticated regional bedrock/glacial isostatic adjustment modeling including regional variations in mantle viscosity, and spatially varying basal sliding properties on the continental shelf. |
format |
Dataset |
author |
Johnson, J.S. Pollard, D. Whitehouse, P.L. Roberts, S.J. Rood, D.H. Schaefer, J.M. |
spellingShingle |
Johnson, J.S. Pollard, D. Whitehouse, P.L. Roberts, S.J. Rood, D.H. Schaefer, J.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, J.S. Pollard, D. Whitehouse, P.L. Roberts, S.J. Rood, D.H. Schaefer, J.M. |
author_sort |
Johnson, J.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 |
Penn State Data Commons |
publishDate |
2020 |
url |
https://dx.doi.org/10.26208/z0m8-ez86 http://www.datacommons.psu.edu/commonswizard/MetadataDisplay.aspx?Dataset=6253 |
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 Ice Sheet Pine Island Pine Island Glacier |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Pine Island Pine Island Glacier |
op_doi |
https://doi.org/10.26208/z0m8-ez86 |
_version_ |
1766376423900053504 |