Impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean
The sensitivity of Antarctic sea-ice to increasing glacial freshwater release into the Southern Ocean is studied in a series of 31-year ocean/sea-ice/iceberg model simulations. Glaciological estimates of ice-shelf melting and iceberg calving are used to better constrain the spatial distribution and...
Published in: | Ocean Modelling |
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Language: | English |
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Online Access: | http://hdl.handle.net/2078.1/193969 https://doi.org/10.1016/j.ocemod.2017.11.009 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:193969 2024-05-19T07:28:21+00:00 Impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean Merino, Nacho Jourdain, Nicolas Le Sommer, Julien Goosse, Hugues Mathiot, Pierre Durand, Gaël UCL - SST/ELI/ELIC - Earth & Climate 2018 http://hdl.handle.net/2078.1/193969 https://doi.org/10.1016/j.ocemod.2017.11.009 eng eng Elsevier Inc. boreal:193969 http://hdl.handle.net/2078.1/193969 doi:10.1016/j.ocemod.2017.11.009 urn:ISSN:1463-5003 urn:EISSN:1463-5011 info:eu-repo/semantics/openAccess Ocean Modelling, Vol. 121, p. 76-89 (2018) Southern Ocean Sea ice glacial freshwater info:eu-repo/semantics/article 2018 ftunivlouvain https://doi.org/10.1016/j.ocemod.2017.11.009 2024-04-24T01:16:51Z The sensitivity of Antarctic sea-ice to increasing glacial freshwater release into the Southern Ocean is studied in a series of 31-year ocean/sea-ice/iceberg model simulations. Glaciological estimates of ice-shelf melting and iceberg calving are used to better constrain the spatial distribution and magnitude of freshwater forcing around Antarctica. Two scenarios of glacial freshwater forcing have been designed to account for a decadal perturbation in glacial freshwater release to the Southern Ocean. For the first time, this perturbation explicitly takes into consideration the spatial distribution of changes in the volume of Antarctic ice shelves, which is found to be a key component of changes in freshwater release. In addition, glacial freshwater-induced changes in sea ice are compared to typical changes induced by the decadal evolution of atmospheric states. Our results show that, in general, the increase in glacial freshwater release increases Antarctic sea ice extent. But the response is opposite in some regions like the coastal Amundsen Sea, implying that distinct physical mechanisms are involved in the response. We also show that changes in freshwater forcing may induce large changes in sea-ice thickness, explaining about one half of the total change due to the combination of atmospheric and freshwater changes. The regional contrasts in our results suggest a need for improving the representation of freshwater sources and their evolution in climate models. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Iceberg* Sea ice Southern Ocean DIAL@UCLouvain (Université catholique de Louvain) Ocean Modelling 121 76 89 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
Southern Ocean Sea ice glacial freshwater |
spellingShingle |
Southern Ocean Sea ice glacial freshwater Merino, Nacho Jourdain, Nicolas Le Sommer, Julien Goosse, Hugues Mathiot, Pierre Durand, Gaël Impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean |
topic_facet |
Southern Ocean Sea ice glacial freshwater |
description |
The sensitivity of Antarctic sea-ice to increasing glacial freshwater release into the Southern Ocean is studied in a series of 31-year ocean/sea-ice/iceberg model simulations. Glaciological estimates of ice-shelf melting and iceberg calving are used to better constrain the spatial distribution and magnitude of freshwater forcing around Antarctica. Two scenarios of glacial freshwater forcing have been designed to account for a decadal perturbation in glacial freshwater release to the Southern Ocean. For the first time, this perturbation explicitly takes into consideration the spatial distribution of changes in the volume of Antarctic ice shelves, which is found to be a key component of changes in freshwater release. In addition, glacial freshwater-induced changes in sea ice are compared to typical changes induced by the decadal evolution of atmospheric states. Our results show that, in general, the increase in glacial freshwater release increases Antarctic sea ice extent. But the response is opposite in some regions like the coastal Amundsen Sea, implying that distinct physical mechanisms are involved in the response. We also show that changes in freshwater forcing may induce large changes in sea-ice thickness, explaining about one half of the total change due to the combination of atmospheric and freshwater changes. The regional contrasts in our results suggest a need for improving the representation of freshwater sources and their evolution in climate models. |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Merino, Nacho Jourdain, Nicolas Le Sommer, Julien Goosse, Hugues Mathiot, Pierre Durand, Gaël |
author_facet |
Merino, Nacho Jourdain, Nicolas Le Sommer, Julien Goosse, Hugues Mathiot, Pierre Durand, Gaël |
author_sort |
Merino, Nacho |
title |
Impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean |
title_short |
Impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean |
title_full |
Impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean |
title_fullStr |
Impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean |
title_full_unstemmed |
Impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean |
title_sort |
impact of increasing antarctic glacial freshwater release on regional sea-ice cover in the southern ocean |
publisher |
Elsevier Inc. |
publishDate |
2018 |
url |
http://hdl.handle.net/2078.1/193969 https://doi.org/10.1016/j.ocemod.2017.11.009 |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Iceberg* Sea ice Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Iceberg* Sea ice Southern Ocean |
op_source |
Ocean Modelling, Vol. 121, p. 76-89 (2018) |
op_relation |
boreal:193969 http://hdl.handle.net/2078.1/193969 doi:10.1016/j.ocemod.2017.11.009 urn:ISSN:1463-5003 urn:EISSN:1463-5011 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.ocemod.2017.11.009 |
container_title |
Ocean Modelling |
container_volume |
121 |
container_start_page |
76 |
op_container_end_page |
89 |
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1799472552746156032 |