Exploration of Antarctic Ice Sheet 100-year contribution to sea level rise and associated model uncertainties using the ISSM framework
Estimating the future evolution of the Antarctic Ice Sheet (AIS) is critical for improving future sea level rise (SLR) projections. Numerical ice sheet models are invaluable tools for bounding Antarctic vulnerability; yet, few continental-scale projections of century-scale AIS SLR contribution exist...
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ftcdlib:oai:escholarship.org:ark:/13030/qt66k04398 2023-09-05T13:11:47+02:00 Exploration of Antarctic Ice Sheet 100-year contribution to sea level rise and associated model uncertainties using the ISSM framework Schlegel, Nicole-Jeanne Seroussi, Helene Schodlok, Michael P Larour, Eric Y Boening, Carmen Limonadi, Daniel Watkins, Michael M Morlighem, Mathieu van den Broeke, Michiel R 3511 - 3534 2018-01-01 https://escholarship.org/uc/item/66k04398 unknown eScholarship, University of California qt66k04398 https://escholarship.org/uc/item/66k04398 public The Cryosphere, vol 12, iss 11 Climate Action Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences article 2018 ftcdlib 2023-08-21T18:05:54Z Estimating the future evolution of the Antarctic Ice Sheet (AIS) is critical for improving future sea level rise (SLR) projections. Numerical ice sheet models are invaluable tools for bounding Antarctic vulnerability; yet, few continental-scale projections of century-scale AIS SLR contribution exist, and those that do vary by up to an order of magnitude. This is partly because model projections of future sea level are inherently uncertain and depend largely on the model's boundary conditions and climate forcing, which themselves are unknown due to the uncertainty in the projections of future anthropogenic emissions and subsequent climate response. Here, we aim to improve the understanding of how uncertainties in model forcing and boundary conditions affect ice sheet model simulations. With use of sampling techniques embedded within the Ice Sheet System Model (ISSM) framework, we assess how uncertainties in snow accumulation, ocean-induced melting, ice viscosity, basal friction, bedrock elevation, and the presence of ice shelves impact continental-scale 100-year model simulations of AIS future sea level contribution. Overall, we find that AIS sea level contribution is strongly affected by grounding line retreat, which is driven by the magnitude of ice shelf basal melt rates and by variations in bedrock topography. In addition, we find that over 1.2 m of AIS global mean sea level contribution over the next century is achievable, but not likely, as it is tenable only in response to unrealistically large melt rates and continental ice shelf collapse. Regionally, we find that under our most extreme 100-year warming experiment generalized for the entire ice sheet, the Amundsen Sea sector is the most significant source of model uncertainty (1032 mm 6σ spread) and the region with the largest potential for future sea level contribution (297 mm). In contrast, under a more plausible forcing informed regionally by literature and model sensitivity studies, the Ronne basin has a greater potential for local increases in ice ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere University of California: eScholarship Amundsen Sea Antarctic Ronne Basin ENVELOPE(-58.000,-58.000,-74.000,-74.000) The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Climate Action Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
spellingShingle |
Climate Action Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences Schlegel, Nicole-Jeanne Seroussi, Helene Schodlok, Michael P Larour, Eric Y Boening, Carmen Limonadi, Daniel Watkins, Michael M Morlighem, Mathieu van den Broeke, Michiel R Exploration of Antarctic Ice Sheet 100-year contribution to sea level rise and associated model uncertainties using the ISSM framework |
topic_facet |
Climate Action Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
description |
Estimating the future evolution of the Antarctic Ice Sheet (AIS) is critical for improving future sea level rise (SLR) projections. Numerical ice sheet models are invaluable tools for bounding Antarctic vulnerability; yet, few continental-scale projections of century-scale AIS SLR contribution exist, and those that do vary by up to an order of magnitude. This is partly because model projections of future sea level are inherently uncertain and depend largely on the model's boundary conditions and climate forcing, which themselves are unknown due to the uncertainty in the projections of future anthropogenic emissions and subsequent climate response. Here, we aim to improve the understanding of how uncertainties in model forcing and boundary conditions affect ice sheet model simulations. With use of sampling techniques embedded within the Ice Sheet System Model (ISSM) framework, we assess how uncertainties in snow accumulation, ocean-induced melting, ice viscosity, basal friction, bedrock elevation, and the presence of ice shelves impact continental-scale 100-year model simulations of AIS future sea level contribution. Overall, we find that AIS sea level contribution is strongly affected by grounding line retreat, which is driven by the magnitude of ice shelf basal melt rates and by variations in bedrock topography. In addition, we find that over 1.2 m of AIS global mean sea level contribution over the next century is achievable, but not likely, as it is tenable only in response to unrealistically large melt rates and continental ice shelf collapse. Regionally, we find that under our most extreme 100-year warming experiment generalized for the entire ice sheet, the Amundsen Sea sector is the most significant source of model uncertainty (1032 mm 6σ spread) and the region with the largest potential for future sea level contribution (297 mm). In contrast, under a more plausible forcing informed regionally by literature and model sensitivity studies, the Ronne basin has a greater potential for local increases in ice ... |
format |
Article in Journal/Newspaper |
author |
Schlegel, Nicole-Jeanne Seroussi, Helene Schodlok, Michael P Larour, Eric Y Boening, Carmen Limonadi, Daniel Watkins, Michael M Morlighem, Mathieu van den Broeke, Michiel R |
author_facet |
Schlegel, Nicole-Jeanne Seroussi, Helene Schodlok, Michael P Larour, Eric Y Boening, Carmen Limonadi, Daniel Watkins, Michael M Morlighem, Mathieu van den Broeke, Michiel R |
author_sort |
Schlegel, Nicole-Jeanne |
title |
Exploration of Antarctic Ice Sheet 100-year contribution to sea level rise and associated model uncertainties using the ISSM framework |
title_short |
Exploration of Antarctic Ice Sheet 100-year contribution to sea level rise and associated model uncertainties using the ISSM framework |
title_full |
Exploration of Antarctic Ice Sheet 100-year contribution to sea level rise and associated model uncertainties using the ISSM framework |
title_fullStr |
Exploration of Antarctic Ice Sheet 100-year contribution to sea level rise and associated model uncertainties using the ISSM framework |
title_full_unstemmed |
Exploration of Antarctic Ice Sheet 100-year contribution to sea level rise and associated model uncertainties using the ISSM framework |
title_sort |
exploration of antarctic ice sheet 100-year contribution to sea level rise and associated model uncertainties using the issm framework |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/66k04398 |
op_coverage |
3511 - 3534 |
long_lat |
ENVELOPE(-58.000,-58.000,-74.000,-74.000) |
geographic |
Amundsen Sea Antarctic Ronne Basin The Antarctic |
geographic_facet |
Amundsen Sea Antarctic Ronne Basin The Antarctic |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
op_source |
The Cryosphere, vol 12, iss 11 |
op_relation |
qt66k04398 https://escholarship.org/uc/item/66k04398 |
op_rights |
public |
_version_ |
1776197024329236480 |