Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale
This study uses an observationally constrained and dynamically consistent ocean and sea ice state estimate. The author presents a remarkable agreement between the location of the edge of Antarctic maximum sea ice extent, reached in September, and the narrow transition band for the upper ocean (0–100...
Published in: | Geophysical Research Letters |
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American Geophysical Union
2017
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Online Access: | https://authors.library.caltech.edu/77992/ https://authors.library.caltech.edu/77992/3/21865f46476bfe54a973fbf0bd3d28a7706930fd943fc008aadc08992cdefb05.pdf https://authors.library.caltech.edu/77992/2/grl56050-sup-0001-2017GL073236_SI.pdf https://resolver.caltech.edu/CaltechAUTHORS:20170607-083207165 |
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ftcaltechauth:oai:authors.library.caltech.edu:77992 2023-05-15T13:55:46+02:00 Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale Su, Zhan 2017-06-28 application/pdf https://authors.library.caltech.edu/77992/ https://authors.library.caltech.edu/77992/3/21865f46476bfe54a973fbf0bd3d28a7706930fd943fc008aadc08992cdefb05.pdf https://authors.library.caltech.edu/77992/2/grl56050-sup-0001-2017GL073236_SI.pdf https://resolver.caltech.edu/CaltechAUTHORS:20170607-083207165 en eng American Geophysical Union https://authors.library.caltech.edu/77992/3/21865f46476bfe54a973fbf0bd3d28a7706930fd943fc008aadc08992cdefb05.pdf https://authors.library.caltech.edu/77992/2/grl56050-sup-0001-2017GL073236_SI.pdf Su, Zhan (2017) Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale. Geophysical Research Letters, 44 (12). pp. 6307-6315. ISSN 0094-8276. doi:10.1002/2017GL073236. https://resolver.caltech.edu/CaltechAUTHORS:20170607-083207165 <https://resolver.caltech.edu/CaltechAUTHORS:20170607-083207165> other Article PeerReviewed 2017 ftcaltechauth https://doi.org/10.1002/2017GL073236 2021-11-18T18:42:23Z This study uses an observationally constrained and dynamically consistent ocean and sea ice state estimate. The author presents a remarkable agreement between the location of the edge of Antarctic maximum sea ice extent, reached in September, and the narrow transition band for the upper ocean (0–100 m depths) stratification, as early as April to June. To the south of this edge, the upper ocean has high stratification, which forbids convective fluxes to cross through; consequently, the ocean heat loss to the atmosphere is an efficient way to cool the surface ocean to the freezing point during April to September. To the north, the upper ocean has low stratification such that the ocean heat loss to the atmosphere is not efficient to cool the upper ocean. The upper ocean is instead cooled mainly through mixing with the colder inflow carried by northward Ekman transport but cannot reach the freezing point due to the nature of mixing. Therefore, upper ocean stratification, dominated by salinity here, provides an important constraint on the northward expansion of Antarctic sea ice to its maximum. Article in Journal/Newspaper Antarc* Antarctic Sea ice Caltech Authors (California Institute of Technology) Antarctic Geophysical Research Letters 44 12 6307 6315 |
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Caltech Authors (California Institute of Technology) |
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ftcaltechauth |
language |
English |
description |
This study uses an observationally constrained and dynamically consistent ocean and sea ice state estimate. The author presents a remarkable agreement between the location of the edge of Antarctic maximum sea ice extent, reached in September, and the narrow transition band for the upper ocean (0–100 m depths) stratification, as early as April to June. To the south of this edge, the upper ocean has high stratification, which forbids convective fluxes to cross through; consequently, the ocean heat loss to the atmosphere is an efficient way to cool the surface ocean to the freezing point during April to September. To the north, the upper ocean has low stratification such that the ocean heat loss to the atmosphere is not efficient to cool the upper ocean. The upper ocean is instead cooled mainly through mixing with the colder inflow carried by northward Ekman transport but cannot reach the freezing point due to the nature of mixing. Therefore, upper ocean stratification, dominated by salinity here, provides an important constraint on the northward expansion of Antarctic sea ice to its maximum. |
format |
Article in Journal/Newspaper |
author |
Su, Zhan |
spellingShingle |
Su, Zhan Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale |
author_facet |
Su, Zhan |
author_sort |
Su, Zhan |
title |
Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale |
title_short |
Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale |
title_full |
Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale |
title_fullStr |
Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale |
title_full_unstemmed |
Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale |
title_sort |
preconditioning of antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale |
publisher |
American Geophysical Union |
publishDate |
2017 |
url |
https://authors.library.caltech.edu/77992/ https://authors.library.caltech.edu/77992/3/21865f46476bfe54a973fbf0bd3d28a7706930fd943fc008aadc08992cdefb05.pdf https://authors.library.caltech.edu/77992/2/grl56050-sup-0001-2017GL073236_SI.pdf https://resolver.caltech.edu/CaltechAUTHORS:20170607-083207165 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
https://authors.library.caltech.edu/77992/3/21865f46476bfe54a973fbf0bd3d28a7706930fd943fc008aadc08992cdefb05.pdf https://authors.library.caltech.edu/77992/2/grl56050-sup-0001-2017GL073236_SI.pdf Su, Zhan (2017) Preconditioning of Antarctic maximum sea-ice extent by upper-ocean stratification on a seasonal timescale. Geophysical Research Letters, 44 (12). pp. 6307-6315. ISSN 0094-8276. doi:10.1002/2017GL073236. https://resolver.caltech.edu/CaltechAUTHORS:20170607-083207165 <https://resolver.caltech.edu/CaltechAUTHORS:20170607-083207165> |
op_rights |
other |
op_doi |
https://doi.org/10.1002/2017GL073236 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
12 |
container_start_page |
6307 |
op_container_end_page |
6315 |
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1766262603677433856 |