ACC meanders, energy transfer, and barotropic–baroclinic instability
Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 47 (2017): 1291-1305, doi:10.1175/JPO-D-16-0160.1....
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/9092 2023-05-15T13:48:30+02:00 ACC meanders, energy transfer, and barotropic–baroclinic instability Youngs, Madeleine K. Thompson, Andrew F. Lazar, Ayah Richards, Kelvin 2017-04-12 https://hdl.handle.net/1912/9092 en_US eng American Meteorological Society https://doi.org/10.1175/JPO-D-16-0160.1 Journal of Physical Oceanography 47 (2017): 1291-1305 https://hdl.handle.net/1912/9092 doi:10.1175/JPO-D-16-0160.1 Journal of Physical Oceanography 47 (2017): 1291-1305 doi:10.1175/JPO-D-16-0160.1 Southern Ocean Channel flows Stability Topographic effects Eddies Mesoscale models Article 2017 ftwhoas https://doi.org/10.1175/JPO-D-16-0160.1 2022-05-28T22:59:56Z Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 47 (2017): 1291-1305, doi:10.1175/JPO-D-16-0160.1. Along-stream variations in the dynamics of the Antarctic Circumpolar Current (ACC) impact heat and tracer transport, regulate interbasin exchange, and influence closure of the overturning circulation. Topography is primarily responsible for generating deviations from zonal-mean properties, mainly through standing meanders associated with regions of high eddy kinetic energy. Here, an idealized channel model is used to explore the spatial distribution of energy exchange and its relationship to eddy geometry, as characterized by both eddy momentum and eddy buoyancy fluxes. Variations in energy exchange properties occur not only between standing meander and quasi-zonal jet regions, but throughout the meander itself. Both barotropic and baroclinic stability properties, as well as the magnitude of energy exchange terms, undergo abrupt changes along the path of the ACC. These transitions are captured by diagnosing eddy fluxes of energy and by adopting the eddy geometry framework. The latter, typically applied to barotropic stability properties, is applied here in the depth–along-stream plane to include information about both barotropic and baroclinic stability properties of the flow. These simulations reveal that eddy momentum fluxes, and thus barotropic instability, play a leading role in the energy budget within a standing meander. This result suggests that baroclinic instability alone cannot capture the dynamics of ACC standing meanders, a challenge for models where eddy fluxes are parameterized. The authors all acknowledge support from NSF OCE-1235488. MKY also acknowledges support from the AMS Graduate Student Fellowship. 2017-10-12 Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Southern Ocean The Antarctic Journal of Physical Oceanography 47 6 1291 1305 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Southern Ocean Channel flows Stability Topographic effects Eddies Mesoscale models |
spellingShingle |
Southern Ocean Channel flows Stability Topographic effects Eddies Mesoscale models Youngs, Madeleine K. Thompson, Andrew F. Lazar, Ayah Richards, Kelvin ACC meanders, energy transfer, and barotropic–baroclinic instability |
topic_facet |
Southern Ocean Channel flows Stability Topographic effects Eddies Mesoscale models |
description |
Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 47 (2017): 1291-1305, doi:10.1175/JPO-D-16-0160.1. Along-stream variations in the dynamics of the Antarctic Circumpolar Current (ACC) impact heat and tracer transport, regulate interbasin exchange, and influence closure of the overturning circulation. Topography is primarily responsible for generating deviations from zonal-mean properties, mainly through standing meanders associated with regions of high eddy kinetic energy. Here, an idealized channel model is used to explore the spatial distribution of energy exchange and its relationship to eddy geometry, as characterized by both eddy momentum and eddy buoyancy fluxes. Variations in energy exchange properties occur not only between standing meander and quasi-zonal jet regions, but throughout the meander itself. Both barotropic and baroclinic stability properties, as well as the magnitude of energy exchange terms, undergo abrupt changes along the path of the ACC. These transitions are captured by diagnosing eddy fluxes of energy and by adopting the eddy geometry framework. The latter, typically applied to barotropic stability properties, is applied here in the depth–along-stream plane to include information about both barotropic and baroclinic stability properties of the flow. These simulations reveal that eddy momentum fluxes, and thus barotropic instability, play a leading role in the energy budget within a standing meander. This result suggests that baroclinic instability alone cannot capture the dynamics of ACC standing meanders, a challenge for models where eddy fluxes are parameterized. The authors all acknowledge support from NSF OCE-1235488. MKY also acknowledges support from the AMS Graduate Student Fellowship. 2017-10-12 |
format |
Article in Journal/Newspaper |
author |
Youngs, Madeleine K. Thompson, Andrew F. Lazar, Ayah Richards, Kelvin |
author_facet |
Youngs, Madeleine K. Thompson, Andrew F. Lazar, Ayah Richards, Kelvin |
author_sort |
Youngs, Madeleine K. |
title |
ACC meanders, energy transfer, and barotropic–baroclinic instability |
title_short |
ACC meanders, energy transfer, and barotropic–baroclinic instability |
title_full |
ACC meanders, energy transfer, and barotropic–baroclinic instability |
title_fullStr |
ACC meanders, energy transfer, and barotropic–baroclinic instability |
title_full_unstemmed |
ACC meanders, energy transfer, and barotropic–baroclinic instability |
title_sort |
acc meanders, energy transfer, and barotropic–baroclinic instability |
publisher |
American Meteorological Society |
publishDate |
2017 |
url |
https://hdl.handle.net/1912/9092 |
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 47 (2017): 1291-1305 doi:10.1175/JPO-D-16-0160.1 |
op_relation |
https://doi.org/10.1175/JPO-D-16-0160.1 Journal of Physical Oceanography 47 (2017): 1291-1305 https://hdl.handle.net/1912/9092 doi:10.1175/JPO-D-16-0160.1 |
op_doi |
https://doi.org/10.1175/JPO-D-16-0160.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
47 |
container_issue |
6 |
container_start_page |
1291 |
op_container_end_page |
1305 |
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1766249342885167104 |