Scaling And Performance Improvements In Elmer/Ice

By gaining and losing mass, glaciers and ice-sheets play a key role in sea level evolution. This is obvious when considering the past 20000 years, during which the collapse of the large northern hemisphere ice-sheets after the Last Glacial Maximum contributed to a 120m rise in sea level. This is par...

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Main Author: Zwinger, Thomas
Format: Report
Language:unknown
Published: Zenodo 2013
Subjects:
Online Access:https://dx.doi.org/10.5281/zenodo.822189
https://zenodo.org/record/822189
id ftdatacite:10.5281/zenodo.822189
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spelling ftdatacite:10.5281/zenodo.822189 2023-05-15T13:36:50+02:00 Scaling And Performance Improvements In Elmer/Ice Zwinger, Thomas 2013 https://dx.doi.org/10.5281/zenodo.822189 https://zenodo.org/record/822189 unknown Zenodo https://dx.doi.org/10.5281/zenodo.822188 Open Access Creative Commons Attribution 4.0 https://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess CC-BY IPCC, HPC Text Working paper article-journal ScholarlyArticle 2013 ftdatacite https://doi.org/10.5281/zenodo.822189 https://doi.org/10.5281/zenodo.822188 2021-11-05T12:55:41Z By gaining and losing mass, glaciers and ice-sheets play a key role in sea level evolution. This is obvious when considering the past 20000 years, during which the collapse of the large northern hemisphere ice-sheets after the Last Glacial Maximum contributed to a 120m rise in sea level. This is particularly worrying when the future is considered. Indeed, recent observations clearly indicate that important changes in the velocity structure of both the Antarctic and Greenland ice-sheets are occurring, suggesting that large and irreversible changes may already have been initiated. This was clearly emphasised in the last report published by the Intergovernmental Panel on Climate Change (IPCC) [7]. The IPCC also asserted that current knowledge of key processes causing the observed accelerations was poor, and concluded that reliable projections obtained with process-based models for sea-level rise (SLR) are currently unavailable. Most of these uncertain key processes have in common that their physical/numerical characteristics, such as shallow ice approximation (SIA), are not accordingly reflected or even completely missing in the established simplified models that have been in use since decades. Whereas those simplified models run on common PC systems, the new approaches require higher resolution and larger computational models, which demand High Performance Computing (HPC) methods to be applied. In other words, numerical glaciology, like climatology and oceanography decades ago, needs to be updated for HPC with scalable codes, in order to deliver the prognostic simulations demanded by the IPCC. The DECI project ElmerIce, and enabling work associated with it, improved simulations of key processes that lead to continental ice loss. The project also developed new data assimilation methods. This was intended to decrease the degree of uncertainty affecting future SLR scenarios and consequently contribute to on-going international debates surrounding coastal adaptation and sea-defence planning. These results directly feed into existing projects, such as the European FP7 project ice2sea [9], which has the objective of improving projections of the contribution of continental ice to future sea-level rise and the French ANR ADAGe project [10], coordinated by O. Gagliardini, which has the objective to develop data assimilation methods dedicated to ice flow studies. Results from these projects will directly impact the upcoming IPCC assessment report (AR5). Report Antarc* Antarctic Greenland DataCite Metadata Store (German National Library of Science and Technology) Antarctic Greenland The Antarctic
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language unknown
topic IPCC, HPC
spellingShingle IPCC, HPC
Zwinger, Thomas
Scaling And Performance Improvements In Elmer/Ice
topic_facet IPCC, HPC
description By gaining and losing mass, glaciers and ice-sheets play a key role in sea level evolution. This is obvious when considering the past 20000 years, during which the collapse of the large northern hemisphere ice-sheets after the Last Glacial Maximum contributed to a 120m rise in sea level. This is particularly worrying when the future is considered. Indeed, recent observations clearly indicate that important changes in the velocity structure of both the Antarctic and Greenland ice-sheets are occurring, suggesting that large and irreversible changes may already have been initiated. This was clearly emphasised in the last report published by the Intergovernmental Panel on Climate Change (IPCC) [7]. The IPCC also asserted that current knowledge of key processes causing the observed accelerations was poor, and concluded that reliable projections obtained with process-based models for sea-level rise (SLR) are currently unavailable. Most of these uncertain key processes have in common that their physical/numerical characteristics, such as shallow ice approximation (SIA), are not accordingly reflected or even completely missing in the established simplified models that have been in use since decades. Whereas those simplified models run on common PC systems, the new approaches require higher resolution and larger computational models, which demand High Performance Computing (HPC) methods to be applied. In other words, numerical glaciology, like climatology and oceanography decades ago, needs to be updated for HPC with scalable codes, in order to deliver the prognostic simulations demanded by the IPCC. The DECI project ElmerIce, and enabling work associated with it, improved simulations of key processes that lead to continental ice loss. The project also developed new data assimilation methods. This was intended to decrease the degree of uncertainty affecting future SLR scenarios and consequently contribute to on-going international debates surrounding coastal adaptation and sea-defence planning. These results directly feed into existing projects, such as the European FP7 project ice2sea [9], which has the objective of improving projections of the contribution of continental ice to future sea-level rise and the French ANR ADAGe project [10], coordinated by O. Gagliardini, which has the objective to develop data assimilation methods dedicated to ice flow studies. Results from these projects will directly impact the upcoming IPCC assessment report (AR5).
format Report
author Zwinger, Thomas
author_facet Zwinger, Thomas
author_sort Zwinger, Thomas
title Scaling And Performance Improvements In Elmer/Ice
title_short Scaling And Performance Improvements In Elmer/Ice
title_full Scaling And Performance Improvements In Elmer/Ice
title_fullStr Scaling And Performance Improvements In Elmer/Ice
title_full_unstemmed Scaling And Performance Improvements In Elmer/Ice
title_sort scaling and performance improvements in elmer/ice
publisher Zenodo
publishDate 2013
url https://dx.doi.org/10.5281/zenodo.822189
https://zenodo.org/record/822189
geographic Antarctic
Greenland
The Antarctic
geographic_facet Antarctic
Greenland
The Antarctic
genre Antarc*
Antarctic
Greenland
genre_facet Antarc*
Antarctic
Greenland
op_relation https://dx.doi.org/10.5281/zenodo.822188
op_rights Open Access
Creative Commons Attribution 4.0
https://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
op_rightsnorm CC-BY
op_doi https://doi.org/10.5281/zenodo.822189
https://doi.org/10.5281/zenodo.822188
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