Continental scale, high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM)
Ice flow models used to project the mass balance of ice sheets in Greenland and Antarctica usually rely on the Shallow Ice Approximation (SIA) and the Shallow-Shelf Approximation (SSA), sometimes combined into so-called "hybrid" models. Such models, while computationally efficient, are bas...
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ftcdlib:oai:escholarship.org/ark:/13030/qt4kn4m9c5 2023-05-15T13:39:57+02:00 Continental scale, high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM) Larour, E Seroussi, H Morlighem, M Rignot, E n/a - n/a 2012-03-01 application/pdf https://escholarship.org/uc/item/4kn4m9c5 unknown eScholarship, University of California qt4kn4m9c5 https://escholarship.org/uc/item/4kn4m9c5 CC-BY CC-BY Journal of Geophysical Research: Earth Surface, vol 117, iss 1 Meteorology & Atmospheric Sciences article 2012 ftcdlib 2020-03-20T23:55:55Z Ice flow models used to project the mass balance of ice sheets in Greenland and Antarctica usually rely on the Shallow Ice Approximation (SIA) and the Shallow-Shelf Approximation (SSA), sometimes combined into so-called "hybrid" models. Such models, while computationally efficient, are based on a simplified set of physical assumptions about the mechanical regime of the ice flow, which does not uniformly apply everywhere on the ice sheet/ice shelf system, especially near grounding lines, where rapid changes are taking place at present. Here, we present a new thermomechanical finite element model of ice flow named ISSM (Ice Sheet System Model) that includes higher-order stresses, high spatial resolution capability and data assimilation techniques to better capture ice dynamics and produce realistic simulations of ice sheet flow at the continental scale. ISSM includes several approximations of the momentum balance equations, ranging from the two-dimensional SSA to the three-dimensional full-Stokes formulation. It also relies on a massively parallelized architecture and state-of-the-art scalable tools. ISSM employs data assimilation techniques, at all levels of approximation of the momentum balance equations, to infer basal drag at the ice-bed interface from satellite radar interferometry-derived observations of ice motion. Following a validation of ISSM with standard benchmarks, we present a demonstration of its capability in the case of the Greenland Ice Sheet. We show ISSM is able to simulate the ice flow of an entire ice sheet realistically at a high spatial resolution, with higher-order physics, thereby providing a pathway for improving projections of ice sheet evolution in a warming climate. Copyright 2012 by the American Geophysical Union. Article in Journal/Newspaper Antarc* Antarctica Greenland Ice Sheet Ice Shelf University of California: eScholarship Greenland |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences |
spellingShingle |
Meteorology & Atmospheric Sciences Larour, E Seroussi, H Morlighem, M Rignot, E Continental scale, high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM) |
topic_facet |
Meteorology & Atmospheric Sciences |
description |
Ice flow models used to project the mass balance of ice sheets in Greenland and Antarctica usually rely on the Shallow Ice Approximation (SIA) and the Shallow-Shelf Approximation (SSA), sometimes combined into so-called "hybrid" models. Such models, while computationally efficient, are based on a simplified set of physical assumptions about the mechanical regime of the ice flow, which does not uniformly apply everywhere on the ice sheet/ice shelf system, especially near grounding lines, where rapid changes are taking place at present. Here, we present a new thermomechanical finite element model of ice flow named ISSM (Ice Sheet System Model) that includes higher-order stresses, high spatial resolution capability and data assimilation techniques to better capture ice dynamics and produce realistic simulations of ice sheet flow at the continental scale. ISSM includes several approximations of the momentum balance equations, ranging from the two-dimensional SSA to the three-dimensional full-Stokes formulation. It also relies on a massively parallelized architecture and state-of-the-art scalable tools. ISSM employs data assimilation techniques, at all levels of approximation of the momentum balance equations, to infer basal drag at the ice-bed interface from satellite radar interferometry-derived observations of ice motion. Following a validation of ISSM with standard benchmarks, we present a demonstration of its capability in the case of the Greenland Ice Sheet. We show ISSM is able to simulate the ice flow of an entire ice sheet realistically at a high spatial resolution, with higher-order physics, thereby providing a pathway for improving projections of ice sheet evolution in a warming climate. Copyright 2012 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Larour, E Seroussi, H Morlighem, M Rignot, E |
author_facet |
Larour, E Seroussi, H Morlighem, M Rignot, E |
author_sort |
Larour, E |
title |
Continental scale, high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM) |
title_short |
Continental scale, high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM) |
title_full |
Continental scale, high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM) |
title_fullStr |
Continental scale, high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM) |
title_full_unstemmed |
Continental scale, high order, high spatial resolution, ice sheet modeling using the Ice Sheet System Model (ISSM) |
title_sort |
continental scale, high order, high spatial resolution, ice sheet modeling using the ice sheet system model (issm) |
publisher |
eScholarship, University of California |
publishDate |
2012 |
url |
https://escholarship.org/uc/item/4kn4m9c5 |
op_coverage |
n/a - n/a |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctica Greenland Ice Sheet Ice Shelf |
op_source |
Journal of Geophysical Research: Earth Surface, vol 117, iss 1 |
op_relation |
qt4kn4m9c5 https://escholarship.org/uc/item/4kn4m9c5 |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766126420554153984 |