Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction
Subduction processes in the Southern Ocean transfer oxygen, heat, and anthropogenic carbon into the ocean interior. The future response of upper-ocean subduction, in the Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW) classes, is dependent on the evolution of the combined surf...
Published in: | Journal of Physical Oceanography |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Amer Meteorological Soc
2017
|
Subjects: | |
Online Access: | https://eprints.utas.edu.au/26798/ https://eprints.utas.edu.au/26798/1/Downes%20et%20al%202017.pdf |
id |
ftunivtasmania:oai:eprints.utas.edu.au:26798 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasmania:oai:eprints.utas.edu.au:26798 2023-05-15T13:31:53+02:00 Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction Downes, SM Langlais, C Brook, JP Spence, P 2017 application/pdf https://eprints.utas.edu.au/26798/ https://eprints.utas.edu.au/26798/1/Downes%20et%20al%202017.pdf en eng Amer Meteorological Soc https://eprints.utas.edu.au/26798/1/Downes%20et%20al%202017.pdf Downes, SM orcid:0000-0002-5595-7243 , Langlais, C, Brook, JP and Spence, P 2017 , 'Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction' , Journal of Physical Oceanography, vol. 47, no. 10 , pp. 2521-2530 , doi:10.1175/JPO-D-17-0106.1 <http://dx.doi.org/10.1175/JPO-D-17-0106.1>. mass fluxes/transport ocean dynamics upwelling/downwelling wind stress Article PeerReviewed 2017 ftunivtasmania https://doi.org/10.1175/JPO-D-17-0106.1 2021-09-13T22:17:41Z Subduction processes in the Southern Ocean transfer oxygen, heat, and anthropogenic carbon into the ocean interior. The future response of upper-ocean subduction, in the Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW) classes, is dependent on the evolution of the combined surface buoyancy forcing and overlying westerly wind stress. Here, the recently observed pattern of a poleward intensification of the westerly winds is divided into its shift and increase components. SAMW and AAIW formation occurs in regional "hot spots" in deep mixed layer zones, primarily in the southeast Indian and Pacific. It is found that the mixed layer depth responds differently to wind stress perturbations across these regional formation zones. An increase only in the westerly winds in the Indian sector steepens isopycnals and increases the local circulation, driving deeper mixed layers and increased subduction. Conversely, in the same region, a poleward shift and poleward intensification of the westerly winds reduces heat loss and increases freshwater input, thus decreasing the mixed layer depth and consequently the associated SAMW and AAIW subduction. In the Pacific sector, all wind stress perturbations lead to increases in heat loss and decreases in freshwater input, resulting in a net increase in SAMW and AAIW subduction. Overall, the poleward shift in the westerly wind stress dominates the SAMWsubduction changes, rather than the increase in wind stress. The net decrease in SAMW subduction across all basins would likely decrease anthropogenic carbon sequestration; however, the net AAIWsubduction changes across the Southern Ocean are overall minor. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean Pacific Indian Journal of Physical Oceanography 47 10 2521 2530 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
mass fluxes/transport ocean dynamics upwelling/downwelling wind stress |
spellingShingle |
mass fluxes/transport ocean dynamics upwelling/downwelling wind stress Downes, SM Langlais, C Brook, JP Spence, P Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction |
topic_facet |
mass fluxes/transport ocean dynamics upwelling/downwelling wind stress |
description |
Subduction processes in the Southern Ocean transfer oxygen, heat, and anthropogenic carbon into the ocean interior. The future response of upper-ocean subduction, in the Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW) classes, is dependent on the evolution of the combined surface buoyancy forcing and overlying westerly wind stress. Here, the recently observed pattern of a poleward intensification of the westerly winds is divided into its shift and increase components. SAMW and AAIW formation occurs in regional "hot spots" in deep mixed layer zones, primarily in the southeast Indian and Pacific. It is found that the mixed layer depth responds differently to wind stress perturbations across these regional formation zones. An increase only in the westerly winds in the Indian sector steepens isopycnals and increases the local circulation, driving deeper mixed layers and increased subduction. Conversely, in the same region, a poleward shift and poleward intensification of the westerly winds reduces heat loss and increases freshwater input, thus decreasing the mixed layer depth and consequently the associated SAMW and AAIW subduction. In the Pacific sector, all wind stress perturbations lead to increases in heat loss and decreases in freshwater input, resulting in a net increase in SAMW and AAIW subduction. Overall, the poleward shift in the westerly wind stress dominates the SAMWsubduction changes, rather than the increase in wind stress. The net decrease in SAMW subduction across all basins would likely decrease anthropogenic carbon sequestration; however, the net AAIWsubduction changes across the Southern Ocean are overall minor. |
format |
Article in Journal/Newspaper |
author |
Downes, SM Langlais, C Brook, JP Spence, P |
author_facet |
Downes, SM Langlais, C Brook, JP Spence, P |
author_sort |
Downes, SM |
title |
Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction |
title_short |
Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction |
title_full |
Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction |
title_fullStr |
Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction |
title_full_unstemmed |
Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction |
title_sort |
regional impacts of the westerly winds on southern ocean mode and intermediate water subduction |
publisher |
Amer Meteorological Soc |
publishDate |
2017 |
url |
https://eprints.utas.edu.au/26798/ https://eprints.utas.edu.au/26798/1/Downes%20et%20al%202017.pdf |
geographic |
Antarctic Southern Ocean Pacific Indian |
geographic_facet |
Antarctic Southern Ocean Pacific Indian |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://eprints.utas.edu.au/26798/1/Downes%20et%20al%202017.pdf Downes, SM orcid:0000-0002-5595-7243 , Langlais, C, Brook, JP and Spence, P 2017 , 'Regional impacts of the westerly winds on Southern Ocean mode and intermediate water subduction' , Journal of Physical Oceanography, vol. 47, no. 10 , pp. 2521-2530 , doi:10.1175/JPO-D-17-0106.1 <http://dx.doi.org/10.1175/JPO-D-17-0106.1>. |
op_doi |
https://doi.org/10.1175/JPO-D-17-0106.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
47 |
container_issue |
10 |
container_start_page |
2521 |
op_container_end_page |
2530 |
_version_ |
1766021808038871040 |