The evolution of a coupled ice shelf-ocean system under different climate states
Based on a new approach for coupled applications of an ice shelf model andan ocean general circulation model, we investigate the evolution of an iceshelf - ocean system and its sensitivity to changed climatic boundary conditions.Combining established 3D models into a coupled model system enabled us...
Published in: | Global and Planetary Change |
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ftawi:oai:epic.awi.de:11267 2023-09-05T13:13:47+02:00 The evolution of a coupled ice shelf-ocean system under different climate states Grosfeld, Klaus Sandhäger, H. 2004 application/pdf https://epic.awi.de/id/eprint/11267/ https://epic.awi.de/id/eprint/11267/1/Gro2004g.pdf https://doi.org/10.1016/j.gloplacha.2003.11.004 https://hdl.handle.net/10013/epic.21725 https://hdl.handle.net/10013/epic.21725.d001 unknown https://epic.awi.de/id/eprint/11267/1/Gro2004g.pdf https://hdl.handle.net/10013/epic.21725.d001 Grosfeld, K. orcid:0000-0001-5936-179X and Sandhäger, H. (2004) The evolution of a coupled ice shelf-ocean system under different climate states , Global and planetary change, 42 , pp. 107-132 . doi:10.1016/j.gloplacha.2003.11.004 <https://doi.org/10.1016/j.gloplacha.2003.11.004> , hdl:10013/epic.21725 EPIC3Global and planetary change, 42, pp. 107-132, ISSN: 0921-8181 Article isiRev 2004 ftawi https://doi.org/10.1016/j.gloplacha.2003.11.004 2023-08-22T19:49:12Z Based on a new approach for coupled applications of an ice shelf model andan ocean general circulation model, we investigate the evolution of an iceshelf - ocean system and its sensitivity to changed climatic boundary conditions.Combining established 3D models into a coupled model system enabled us tostudy the reaction and feedbacks of each component to changes at theirinterface, the ice shelf base. After calculating the dynamics for prescribed initialice shelf and bathymetric geometries, the basal mass balance determines thesystem evolution. In order to explore possible developments for given boundaryconditions, an idealized geometry has been chosen, reflecting basic featuresof the Filchner-Ronne Ice Shelf, Antarctica. The model system is found to beespecially sensitive in regions where high ablation or accretion rates occur. IceShelf Water formation as well as the build up of a marine ice body, resultingfrom accretion of marine ice, is simulated, indicating strong interaction processes.To improve consistency between modeled and observed ice shelf behavior,we incorporate the typical cycle of steady ice front advance and sudden retreatdue to tabular iceberg calving in our time-dependent simulations. Our basichypothesis is that iceberg break off is associated with abrupt crack propagationalong elongated anomalies of the inherent stress field of the ice body. This newconcept yields glaciologically plausible results and represents an auspicious basisfor the development of a thorough calving criterion.Experiments under different climatic conditions (ocean warming of 0.2 and 0.5 °Cand doubled surface accumulation rates) show the coupled model system to besensitive especially to ocean warming. Increased basal melt rates of 100 % forthe 0.5 °C ocean warming scenario and an asymmetric development of ice shelfthicknesses suggest a high vulnerability of ice shelf regions, which representpivotal areas between the Antarctic Ice Sheet and the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Iceberg* Ronne Ice Shelf Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Southern Ocean The Antarctic Global and Planetary Change 42 1-4 107 132 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Based on a new approach for coupled applications of an ice shelf model andan ocean general circulation model, we investigate the evolution of an iceshelf - ocean system and its sensitivity to changed climatic boundary conditions.Combining established 3D models into a coupled model system enabled us tostudy the reaction and feedbacks of each component to changes at theirinterface, the ice shelf base. After calculating the dynamics for prescribed initialice shelf and bathymetric geometries, the basal mass balance determines thesystem evolution. In order to explore possible developments for given boundaryconditions, an idealized geometry has been chosen, reflecting basic featuresof the Filchner-Ronne Ice Shelf, Antarctica. The model system is found to beespecially sensitive in regions where high ablation or accretion rates occur. IceShelf Water formation as well as the build up of a marine ice body, resultingfrom accretion of marine ice, is simulated, indicating strong interaction processes.To improve consistency between modeled and observed ice shelf behavior,we incorporate the typical cycle of steady ice front advance and sudden retreatdue to tabular iceberg calving in our time-dependent simulations. Our basichypothesis is that iceberg break off is associated with abrupt crack propagationalong elongated anomalies of the inherent stress field of the ice body. This newconcept yields glaciologically plausible results and represents an auspicious basisfor the development of a thorough calving criterion.Experiments under different climatic conditions (ocean warming of 0.2 and 0.5 °Cand doubled surface accumulation rates) show the coupled model system to besensitive especially to ocean warming. Increased basal melt rates of 100 % forthe 0.5 °C ocean warming scenario and an asymmetric development of ice shelfthicknesses suggest a high vulnerability of ice shelf regions, which representpivotal areas between the Antarctic Ice Sheet and the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Grosfeld, Klaus Sandhäger, H. |
spellingShingle |
Grosfeld, Klaus Sandhäger, H. The evolution of a coupled ice shelf-ocean system under different climate states |
author_facet |
Grosfeld, Klaus Sandhäger, H. |
author_sort |
Grosfeld, Klaus |
title |
The evolution of a coupled ice shelf-ocean system under different climate states |
title_short |
The evolution of a coupled ice shelf-ocean system under different climate states |
title_full |
The evolution of a coupled ice shelf-ocean system under different climate states |
title_fullStr |
The evolution of a coupled ice shelf-ocean system under different climate states |
title_full_unstemmed |
The evolution of a coupled ice shelf-ocean system under different climate states |
title_sort |
evolution of a coupled ice shelf-ocean system under different climate states |
publishDate |
2004 |
url |
https://epic.awi.de/id/eprint/11267/ https://epic.awi.de/id/eprint/11267/1/Gro2004g.pdf https://doi.org/10.1016/j.gloplacha.2003.11.004 https://hdl.handle.net/10013/epic.21725 https://hdl.handle.net/10013/epic.21725.d001 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic Ronne Ice Shelf Southern Ocean The Antarctic |
geographic_facet |
Antarctic Ronne Ice Shelf Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Iceberg* Ronne Ice Shelf Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Iceberg* Ronne Ice Shelf Southern Ocean |
op_source |
EPIC3Global and planetary change, 42, pp. 107-132, ISSN: 0921-8181 |
op_relation |
https://epic.awi.de/id/eprint/11267/1/Gro2004g.pdf https://hdl.handle.net/10013/epic.21725.d001 Grosfeld, K. orcid:0000-0001-5936-179X and Sandhäger, H. (2004) The evolution of a coupled ice shelf-ocean system under different climate states , Global and planetary change, 42 , pp. 107-132 . doi:10.1016/j.gloplacha.2003.11.004 <https://doi.org/10.1016/j.gloplacha.2003.11.004> , hdl:10013/epic.21725 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2003.11.004 |
container_title |
Global and Planetary Change |
container_volume |
42 |
container_issue |
1-4 |
container_start_page |
107 |
op_container_end_page |
132 |
_version_ |
1776204944810967040 |