The Cold Transit of Southern Ocean Upwelling
The upwelling of deep waters in the Southern Ocean is a critical component of the climate system. The time and zonal mean dynamics of this circulation describe the upwelling of Circumpolar Deep Water and the downwelling of Antarctic Intermediate Water. The thermodynamic drivers of the circulation an...
Published in: | Geophysical Research Letters |
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American Geophysical Union (AGU)
2018
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Online Access: | http://hdl.handle.net/1959.4/unsworks_73557 https://doi.org/10.1029/2018GL079986 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_73557 2024-05-12T07:56:06+00:00 The Cold Transit of Southern Ocean Upwelling Evans, DG Zika, JD Naveira Garabato, AC Nurser, AJG 2018-12-28 http://hdl.handle.net/1959.4/unsworks_73557 https://doi.org/10.1029/2018GL079986 unknown American Geophysical Union (AGU) http://purl.org/au-research/grants/arc/DP160103130 http://hdl.handle.net/1959.4/unsworks_73557 https://doi.org/10.1029/2018GL079986 metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ urn:ISSN:0094-8276 urn:ISSN:1944-8007 Geophysical Research Letters, 45, 24, 13-395 14 Life Below Water 13 Climate Action journal article http://purl.org/coar/resource_type/c_6501 2018 ftunswworks https://doi.org/10.1029/2018GL079986 2024-04-17T15:55:34Z The upwelling of deep waters in the Southern Ocean is a critical component of the climate system. The time and zonal mean dynamics of this circulation describe the upwelling of Circumpolar Deep Water and the downwelling of Antarctic Intermediate Water. The thermodynamic drivers of the circulation and their seasonal cycle play a potentially key regulatory role. Here an observationally constrained ocean model and an observation-based seasonal climatology are analyzed from a thermodynamic perspective, to assess the diabatic processes controlling overturning in the Southern Ocean. This reveals a seasonal two-stage cold transit in the formation of intermediate water from upwelled deep water. First, relatively warm and saline deep water is transformed into colder and fresher near-surface winter water via wintertime mixing. Second, winter water warms to form intermediate water through summertime surface heat fluxes. The mixing-driven pathway from deep water to winter water follows mixing lines in thermohaline coordinates indicative of nonlinear processes. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean UNSW Sydney (The University of New South Wales): UNSWorks Antarctic Southern Ocean Geophysical Research Letters 45 24 |
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Open Polar |
collection |
UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
14 Life Below Water 13 Climate Action |
spellingShingle |
14 Life Below Water 13 Climate Action Evans, DG Zika, JD Naveira Garabato, AC Nurser, AJG The Cold Transit of Southern Ocean Upwelling |
topic_facet |
14 Life Below Water 13 Climate Action |
description |
The upwelling of deep waters in the Southern Ocean is a critical component of the climate system. The time and zonal mean dynamics of this circulation describe the upwelling of Circumpolar Deep Water and the downwelling of Antarctic Intermediate Water. The thermodynamic drivers of the circulation and their seasonal cycle play a potentially key regulatory role. Here an observationally constrained ocean model and an observation-based seasonal climatology are analyzed from a thermodynamic perspective, to assess the diabatic processes controlling overturning in the Southern Ocean. This reveals a seasonal two-stage cold transit in the formation of intermediate water from upwelled deep water. First, relatively warm and saline deep water is transformed into colder and fresher near-surface winter water via wintertime mixing. Second, winter water warms to form intermediate water through summertime surface heat fluxes. The mixing-driven pathway from deep water to winter water follows mixing lines in thermohaline coordinates indicative of nonlinear processes. |
format |
Article in Journal/Newspaper |
author |
Evans, DG Zika, JD Naveira Garabato, AC Nurser, AJG |
author_facet |
Evans, DG Zika, JD Naveira Garabato, AC Nurser, AJG |
author_sort |
Evans, DG |
title |
The Cold Transit of Southern Ocean Upwelling |
title_short |
The Cold Transit of Southern Ocean Upwelling |
title_full |
The Cold Transit of Southern Ocean Upwelling |
title_fullStr |
The Cold Transit of Southern Ocean Upwelling |
title_full_unstemmed |
The Cold Transit of Southern Ocean Upwelling |
title_sort |
cold transit of southern ocean upwelling |
publisher |
American Geophysical Union (AGU) |
publishDate |
2018 |
url |
http://hdl.handle.net/1959.4/unsworks_73557 https://doi.org/10.1029/2018GL079986 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
urn:ISSN:0094-8276 urn:ISSN:1944-8007 Geophysical Research Letters, 45, 24, 13-395 |
op_relation |
http://purl.org/au-research/grants/arc/DP160103130 http://hdl.handle.net/1959.4/unsworks_73557 https://doi.org/10.1029/2018GL079986 |
op_rights |
metadata only access http://purl.org/coar/access_right/c_14cb CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1029/2018GL079986 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
24 |
_version_ |
1798836037093425152 |