Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations
Antarctic sea‐ice formation plays a key role in shaping the abyssal overturning circulation and stratification in all ocean basins, by driving surface buoyancy loss through the associated brine rejection. Changes in Antarctic sea ice have therefore been suggested as drivers of major glacial‐intergla...
Published in: | Geophysical Research Letters |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/521900/ https://nora.nerc.ac.uk/id/eprint/521900/1/Marzocchi_et_al-2017-Geophysical_Research_Letters.pdf https://doi.org/10.1002/2017GL073936 |
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ftnerc:oai:nora.nerc.ac.uk:521900 2023-05-15T13:41:42+02:00 Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations Marzocchi, Alice Jansen, Malte F. 2017 text http://nora.nerc.ac.uk/id/eprint/521900/ https://nora.nerc.ac.uk/id/eprint/521900/1/Marzocchi_et_al-2017-Geophysical_Research_Letters.pdf https://doi.org/10.1002/2017GL073936 en eng https://nora.nerc.ac.uk/id/eprint/521900/1/Marzocchi_et_al-2017-Geophysical_Research_Letters.pdf Marzocchi, Alice orcid:0000-0002-3430-3574 Jansen, Malte F. 2017 Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations. Geophysical Research Letters, 44 (12). 6286-6295. https://doi.org/10.1002/2017GL073936 <https://doi.org/10.1002/2017GL073936> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1002/2017GL073936 2023-02-04T19:47:35Z Antarctic sea‐ice formation plays a key role in shaping the abyssal overturning circulation and stratification in all ocean basins, by driving surface buoyancy loss through the associated brine rejection. Changes in Antarctic sea ice have therefore been suggested as drivers of major glacial‐interglacial ocean circulation rearrangements. Here, the relationship between Antarctic sea ice, buoyancy loss, deep‐ocean stratification, and overturning circulation is investigated in Last Glacial Maximum and preindustrial simulations from the Paleoclimate Modelling Intercomparison Project (PMIP). The simulations show substantial intermodel differences in their representation of the glacial deep‐ocean state and circulation, which is often at odds with the geological evidence. We argue that these apparent inconsistencies can largely be attributed to differing (and likely insufficient) Antarctic sea‐ice formation. Discrepancies can be further amplified by short integration times. Deep‐ocean equilibration and sea‐ice representation should, therefore, be carefully evaluated in the forthcoming PMIP4 simulations. Article in Journal/Newspaper Antarc* Antarctic Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Geophysical Research Letters 44 12 6286 6295 |
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Natural Environment Research Council: NERC Open Research Archive |
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English |
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Antarctic sea‐ice formation plays a key role in shaping the abyssal overturning circulation and stratification in all ocean basins, by driving surface buoyancy loss through the associated brine rejection. Changes in Antarctic sea ice have therefore been suggested as drivers of major glacial‐interglacial ocean circulation rearrangements. Here, the relationship between Antarctic sea ice, buoyancy loss, deep‐ocean stratification, and overturning circulation is investigated in Last Glacial Maximum and preindustrial simulations from the Paleoclimate Modelling Intercomparison Project (PMIP). The simulations show substantial intermodel differences in their representation of the glacial deep‐ocean state and circulation, which is often at odds with the geological evidence. We argue that these apparent inconsistencies can largely be attributed to differing (and likely insufficient) Antarctic sea‐ice formation. Discrepancies can be further amplified by short integration times. Deep‐ocean equilibration and sea‐ice representation should, therefore, be carefully evaluated in the forthcoming PMIP4 simulations. |
format |
Article in Journal/Newspaper |
author |
Marzocchi, Alice Jansen, Malte F. |
spellingShingle |
Marzocchi, Alice Jansen, Malte F. Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations |
author_facet |
Marzocchi, Alice Jansen, Malte F. |
author_sort |
Marzocchi, Alice |
title |
Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations |
title_short |
Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations |
title_full |
Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations |
title_fullStr |
Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations |
title_full_unstemmed |
Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations |
title_sort |
connecting antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/521900/ https://nora.nerc.ac.uk/id/eprint/521900/1/Marzocchi_et_al-2017-Geophysical_Research_Letters.pdf https://doi.org/10.1002/2017GL073936 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/521900/1/Marzocchi_et_al-2017-Geophysical_Research_Letters.pdf Marzocchi, Alice orcid:0000-0002-3430-3574 Jansen, Malte F. 2017 Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations. Geophysical Research Letters, 44 (12). 6286-6295. https://doi.org/10.1002/2017GL073936 <https://doi.org/10.1002/2017GL073936> |
op_doi |
https://doi.org/10.1002/2017GL073936 |
container_title |
Geophysical Research Letters |
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44 |
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12 |
container_start_page |
6286 |
op_container_end_page |
6295 |
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1766154263702011904 |