Short-term impacts of enhanced Greenland freshwater fluxes in an eddy-permitting ocean model
International audience In a sensitivity experiment, an eddy-permitting ocean general circulation model is forced with realistic freshwater fluxes from the Greenland Ice Sheet, averaged for the period 1991-2000. The fluxes are obtained with a mass balance model for the ice sheet, forced with the ERA-...
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ftunivbrest:oai:HAL:hal-00588835v1 2023-12-17T10:27:34+01:00 Short-term impacts of enhanced Greenland freshwater fluxes in an eddy-permitting ocean model Marsh, R. Desbruyères, D. Bamber, J. L. de Cuevas, B. A. C. Coward, A. Aksenov, Y. Ocean and Earth Science Southampton University of Southampton-National Oceanography Centre (NOC) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Bristol Glaciology Centre School of Geographical Sciences National Oceanography Centre Southampton (NOC) University of Southampton 2010 https://hal.science/hal-00588835 https://doi.org/10.5194/os-6-749-2010 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/os-6-749-2010 hal-00588835 https://hal.science/hal-00588835 doi:10.5194/os-6-749-2010 ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-00588835 Ocean Science, 2010, 6 (3), pp.749-760. ⟨10.5194/os-6-749-2010⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2010 ftunivbrest https://doi.org/10.5194/os-6-749-2010 2023-11-21T23:36:53Z International audience In a sensitivity experiment, an eddy-permitting ocean general circulation model is forced with realistic freshwater fluxes from the Greenland Ice Sheet, averaged for the period 1991-2000. The fluxes are obtained with a mass balance model for the ice sheet, forced with the ERA-40 reanalysis dataset. The freshwater flux is distributed around Greenland as an additional term in prescribed runoff, representing seasonal melting of the ice sheet and a fixed year-round iceberg calving flux, for 8.5 model years. By adding Greenland freshwater fluxes with realistic geographical distribution and seasonality, the experiment is designed to investigate the oceanic response to a sudden and spatially/temporally uniform amplification of ice sheet melting and discharge, rather than localized or gradual changes in freshwater flux. The impacts on regional hydrography and circulation are investigated by comparing the sensitivity experiment to a control experiment, without additional fluxes. By the end of the sensitivity experiment, the majority of additional fresh water has accumulated in Baffin Bay, and only a small fraction has reached the interior of the Labrador Sea, where winter mixed layer depth is sensitive to small changes in salinity. As a consequence, the impact on large-scale circulation is very slight. An indirect impact of strong freshening off the west coast of Greenland is a small anti-cyclonic component to the circulation around Greenland, which opposes the wind-driven cyclonic circulation and reduces net southward flow through the Canadian Archipelago by ~10%. Implications for the post-2000 acceleration of Greenland mass loss are discussed. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Canadian Archipelago Greenland Ice Sheet Labrador Sea Université de Bretagne Occidentale: HAL Baffin Bay Greenland Ocean Science 6 3 749 760 |
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Open Polar |
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Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
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[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Marsh, R. Desbruyères, D. Bamber, J. L. de Cuevas, B. A. C. Coward, A. Aksenov, Y. Short-term impacts of enhanced Greenland freshwater fluxes in an eddy-permitting ocean model |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience In a sensitivity experiment, an eddy-permitting ocean general circulation model is forced with realistic freshwater fluxes from the Greenland Ice Sheet, averaged for the period 1991-2000. The fluxes are obtained with a mass balance model for the ice sheet, forced with the ERA-40 reanalysis dataset. The freshwater flux is distributed around Greenland as an additional term in prescribed runoff, representing seasonal melting of the ice sheet and a fixed year-round iceberg calving flux, for 8.5 model years. By adding Greenland freshwater fluxes with realistic geographical distribution and seasonality, the experiment is designed to investigate the oceanic response to a sudden and spatially/temporally uniform amplification of ice sheet melting and discharge, rather than localized or gradual changes in freshwater flux. The impacts on regional hydrography and circulation are investigated by comparing the sensitivity experiment to a control experiment, without additional fluxes. By the end of the sensitivity experiment, the majority of additional fresh water has accumulated in Baffin Bay, and only a small fraction has reached the interior of the Labrador Sea, where winter mixed layer depth is sensitive to small changes in salinity. As a consequence, the impact on large-scale circulation is very slight. An indirect impact of strong freshening off the west coast of Greenland is a small anti-cyclonic component to the circulation around Greenland, which opposes the wind-driven cyclonic circulation and reduces net southward flow through the Canadian Archipelago by ~10%. Implications for the post-2000 acceleration of Greenland mass loss are discussed. |
author2 |
Ocean and Earth Science Southampton University of Southampton-National Oceanography Centre (NOC) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Bristol Glaciology Centre School of Geographical Sciences National Oceanography Centre Southampton (NOC) University of Southampton |
format |
Article in Journal/Newspaper |
author |
Marsh, R. Desbruyères, D. Bamber, J. L. de Cuevas, B. A. C. Coward, A. Aksenov, Y. |
author_facet |
Marsh, R. Desbruyères, D. Bamber, J. L. de Cuevas, B. A. C. Coward, A. Aksenov, Y. |
author_sort |
Marsh, R. |
title |
Short-term impacts of enhanced Greenland freshwater fluxes in an eddy-permitting ocean model |
title_short |
Short-term impacts of enhanced Greenland freshwater fluxes in an eddy-permitting ocean model |
title_full |
Short-term impacts of enhanced Greenland freshwater fluxes in an eddy-permitting ocean model |
title_fullStr |
Short-term impacts of enhanced Greenland freshwater fluxes in an eddy-permitting ocean model |
title_full_unstemmed |
Short-term impacts of enhanced Greenland freshwater fluxes in an eddy-permitting ocean model |
title_sort |
short-term impacts of enhanced greenland freshwater fluxes in an eddy-permitting ocean model |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00588835 https://doi.org/10.5194/os-6-749-2010 |
geographic |
Baffin Bay Greenland |
geographic_facet |
Baffin Bay Greenland |
genre |
Baffin Bay Baffin Bay Baffin Canadian Archipelago Greenland Ice Sheet Labrador Sea |
genre_facet |
Baffin Bay Baffin Bay Baffin Canadian Archipelago Greenland Ice Sheet Labrador Sea |
op_source |
ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.science/hal-00588835 Ocean Science, 2010, 6 (3), pp.749-760. ⟨10.5194/os-6-749-2010⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-6-749-2010 hal-00588835 https://hal.science/hal-00588835 doi:10.5194/os-6-749-2010 |
op_doi |
https://doi.org/10.5194/os-6-749-2010 |
container_title |
Ocean Science |
container_volume |
6 |
container_issue |
3 |
container_start_page |
749 |
op_container_end_page |
760 |
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1785579459142746112 |