The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model
An overturning circulation, driven by prescribed buoyancy forcing, is used to set a zonal volume transport in a reentrant channel ocean model with three isopycnal layers. The channel is designed to represent the Southern Ocean such that the forced overturning resembles the lower limb of the meridion...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/15020 2024-01-14T10:02:20+01:00 The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model Howard, Emma Hogg, Andy Waterman, Stephanie Marshall, David P. 13 pages http://hdl.handle.net/1885/15020 https://doi.org/10.1175/JPO-D-14-0098.1 https://openresearch-repository.anu.edu.au/bitstream/1885/15020/4/Howard%20E%20et%20al%20The%20injection%20of%20zonal%20momentum%202015.pdf.jpg unknown American Meteorological Society http://purl.org/au-research/grants/arc/FT120100842 0022-3670 http://hdl.handle.net/1885/15020 doi:10.1175/JPO-D-14-0098.1 https://openresearch-repository.anu.edu.au/bitstream/1885/15020/4/Howard%20E%20et%20al%20The%20injection%20of%20zonal%20momentum%202015.pdf.jpg © 2015 American Meteorological Society https://www2.ametsoc.org/ams/index.cfm/publications/authors/journal-and-bams-authors/author-resources/copyright-information/copyright-policy/Publisher's website permission to archive publisher's pdf after an embargo period of 6 months. The same for Sherpa/Romeo http://www.sherpa.ac.uk/romeo/issn/0022-3670/ (As of 31/8/2015). Journal of Physical Oceanography Buoyancy Circulation/Dynamics Eddies Geographic location/entity Southern Ocean Meridional overturning circulation Topographic effects Wind stress Journal article ftanucanberra https://doi.org/10.1175/JPO-D-14-0098.1 2023-12-15T09:39:28Z An overturning circulation, driven by prescribed buoyancy forcing, is used to set a zonal volume transport in a reentrant channel ocean model with three isopycnal layers. The channel is designed to represent the Southern Ocean such that the forced overturning resembles the lower limb of the meridional overturning circulation (MOC). The relative contributions of wind and buoyancy forcing to the zonal circulation are examined. It is found that the zonal volume transport is strongly dependent on the buoyancy forcing and that the eddy kinetic energy is primarily set by wind stress forcing. The zonal momentum budget integrated over each layer is considered in the buoyancy-forced, wind-forced, and combined forcing case. At equilibrium, sources and sinks of momentum are balanced, but the transient spinup reveals the source of momentum for the current. In the buoyancy-forced case, the forcing creates a baroclinic shear with westward flow in the lower layer, allowing topographic form stress and bottom friction to act as the initial sources of eastward momentum, with bottom friction acting over a longer time frame. In the wind-forced and combined forcing cases, the surface wind stress dominates the initial momentum budget, and the time to reach equilibration is shorter in the combined forcing simulation. These results imply that future changes in the rate of formation of Antarctic Bottom Water may alter the volume transport of the Antarctic Circumpolar Current. EH gratefully acknowledges the support of an A. L. Hales Scholarship provided by RSES. AMH was supported by an Australian Research Council Future Fellowship FT120100842. This research was undertaken on the NCI National Facility in Canberra, Australia, which is supported by the Australian Commonwealth Government. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Australian National University: ANU Digital Collections Antarctic Southern Ocean The Antarctic Journal of Physical Oceanography 45 1 259 271 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Buoyancy Circulation/Dynamics Eddies Geographic location/entity Southern Ocean Meridional overturning circulation Topographic effects Wind stress |
spellingShingle |
Buoyancy Circulation/Dynamics Eddies Geographic location/entity Southern Ocean Meridional overturning circulation Topographic effects Wind stress Howard, Emma Hogg, Andy Waterman, Stephanie Marshall, David P. The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model |
topic_facet |
Buoyancy Circulation/Dynamics Eddies Geographic location/entity Southern Ocean Meridional overturning circulation Topographic effects Wind stress |
description |
An overturning circulation, driven by prescribed buoyancy forcing, is used to set a zonal volume transport in a reentrant channel ocean model with three isopycnal layers. The channel is designed to represent the Southern Ocean such that the forced overturning resembles the lower limb of the meridional overturning circulation (MOC). The relative contributions of wind and buoyancy forcing to the zonal circulation are examined. It is found that the zonal volume transport is strongly dependent on the buoyancy forcing and that the eddy kinetic energy is primarily set by wind stress forcing. The zonal momentum budget integrated over each layer is considered in the buoyancy-forced, wind-forced, and combined forcing case. At equilibrium, sources and sinks of momentum are balanced, but the transient spinup reveals the source of momentum for the current. In the buoyancy-forced case, the forcing creates a baroclinic shear with westward flow in the lower layer, allowing topographic form stress and bottom friction to act as the initial sources of eastward momentum, with bottom friction acting over a longer time frame. In the wind-forced and combined forcing cases, the surface wind stress dominates the initial momentum budget, and the time to reach equilibration is shorter in the combined forcing simulation. These results imply that future changes in the rate of formation of Antarctic Bottom Water may alter the volume transport of the Antarctic Circumpolar Current. EH gratefully acknowledges the support of an A. L. Hales Scholarship provided by RSES. AMH was supported by an Australian Research Council Future Fellowship FT120100842. This research was undertaken on the NCI National Facility in Canberra, Australia, which is supported by the Australian Commonwealth Government. |
format |
Article in Journal/Newspaper |
author |
Howard, Emma Hogg, Andy Waterman, Stephanie Marshall, David P. |
author_facet |
Howard, Emma Hogg, Andy Waterman, Stephanie Marshall, David P. |
author_sort |
Howard, Emma |
title |
The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model |
title_short |
The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model |
title_full |
The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model |
title_fullStr |
The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model |
title_full_unstemmed |
The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model |
title_sort |
injection of zonal momentum by buoyancy forcing in a southern ocean model |
publisher |
American Meteorological Society |
url |
http://hdl.handle.net/1885/15020 https://doi.org/10.1175/JPO-D-14-0098.1 https://openresearch-repository.anu.edu.au/bitstream/1885/15020/4/Howard%20E%20et%20al%20The%20injection%20of%20zonal%20momentum%202015.pdf.jpg |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Journal of Physical Oceanography |
op_relation |
http://purl.org/au-research/grants/arc/FT120100842 0022-3670 http://hdl.handle.net/1885/15020 doi:10.1175/JPO-D-14-0098.1 https://openresearch-repository.anu.edu.au/bitstream/1885/15020/4/Howard%20E%20et%20al%20The%20injection%20of%20zonal%20momentum%202015.pdf.jpg |
op_rights |
© 2015 American Meteorological Society https://www2.ametsoc.org/ams/index.cfm/publications/authors/journal-and-bams-authors/author-resources/copyright-information/copyright-policy/Publisher's website permission to archive publisher's pdf after an embargo period of 6 months. The same for Sherpa/Romeo http://www.sherpa.ac.uk/romeo/issn/0022-3670/ (As of 31/8/2015). |
op_doi |
https://doi.org/10.1175/JPO-D-14-0098.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
45 |
container_issue |
1 |
container_start_page |
259 |
op_container_end_page |
271 |
_version_ |
1788057303023353856 |