A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model.
International audience An energy analysis of the Fine Resolution Antarctic Model (FRAM) reveals the instability processes in the model. The main source of time-mean kinetic energy is the wind stress and the main sink is transfer to mean potential energy. The wind forcing thus helps maintain the dens...
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ftunivbrest:oai:HAL:hal-00268272v1 2023-12-17T10:22:00+01:00 A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model. Ivchenko, V. O. Tréguier, Anne-Marie E. Best, S. Department of Oceanography University of Southampton Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 1997-01 https://hal.science/hal-00268272 https://doi.org/10.1175/1520-0485(1997)027<0005:AKEBAI>2.0.CO;2 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0485(1997)027<0005:AKEBAI>2.0.CO;2 hal-00268272 https://hal.science/hal-00268272 doi:10.1175/1520-0485(1997)027<0005:AKEBAI>2.0.CO;2 ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-00268272 Journal of Physical Oceanography, 1997, 27 (1), pp.5-22. ⟨10.1175/1520-0485(1997)0272.0.CO;2⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 1997 ftunivbrest https://doi.org/10.1175/1520-0485(1997)027<0005:AKEBAI>2.0.CO;210.1175/1520-0485(1997)0272.0.CO;2 2023-11-21T23:41:01Z International audience An energy analysis of the Fine Resolution Antarctic Model (FRAM) reveals the instability processes in the model. The main source of time-mean kinetic energy is the wind stress and the main sink is transfer to mean potential energy. The wind forcing thus helps maintain the density structure. Transient motions result from internal instabilities of the flow rather than seasonal variations of the forcing. Baroclinic instability is found to be an important mechanism in FRAM. The highest values of available potential energy are found in the western boundary regions as well as in the Antarctic Circumpolar Current (ACC) region. All subregions with predominantly zonal flow are found to be baroclinically unstable. The observed deficit of eddy kinetic energy in FRAM occurs as a result of the high lateral friction, which decreases the growth rates of the most unstable waves. This high friction is required for the numerical stability of the model and can only be made smaller by using a finer horizontal resolution. A grid spacing of at least 10–15 km would be required to resolve the most unstable waves in the southern part of the domain. Barotropic instability is also found to be important for the total domain balance. The inverse transfer (that is, transfer from eddy to mean kinetic energy) does not occur anywhere, except in very localized tight jets in the ACC. The open boundary condition at the northern edge of the model domain does not represent a significant source or sink of eddy variability. However, a large exchange between internal and external mode energies is found to occur. It is still unclear how these boundary conditions affect the dynamics of adjacent regions. Article in Journal/Newspaper Antarc* Antarctic Université de Bretagne Occidentale: HAL Antarctic The Antarctic |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Ivchenko, V. O. Tréguier, Anne-Marie E. Best, S. A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model. |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience An energy analysis of the Fine Resolution Antarctic Model (FRAM) reveals the instability processes in the model. The main source of time-mean kinetic energy is the wind stress and the main sink is transfer to mean potential energy. The wind forcing thus helps maintain the density structure. Transient motions result from internal instabilities of the flow rather than seasonal variations of the forcing. Baroclinic instability is found to be an important mechanism in FRAM. The highest values of available potential energy are found in the western boundary regions as well as in the Antarctic Circumpolar Current (ACC) region. All subregions with predominantly zonal flow are found to be baroclinically unstable. The observed deficit of eddy kinetic energy in FRAM occurs as a result of the high lateral friction, which decreases the growth rates of the most unstable waves. This high friction is required for the numerical stability of the model and can only be made smaller by using a finer horizontal resolution. A grid spacing of at least 10–15 km would be required to resolve the most unstable waves in the southern part of the domain. Barotropic instability is also found to be important for the total domain balance. The inverse transfer (that is, transfer from eddy to mean kinetic energy) does not occur anywhere, except in very localized tight jets in the ACC. The open boundary condition at the northern edge of the model domain does not represent a significant source or sink of eddy variability. However, a large exchange between internal and external mode energies is found to occur. It is still unclear how these boundary conditions affect the dynamics of adjacent regions. |
author2 |
Department of Oceanography University of Southampton Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ivchenko, V. O. Tréguier, Anne-Marie E. Best, S. |
author_facet |
Ivchenko, V. O. Tréguier, Anne-Marie E. Best, S. |
author_sort |
Ivchenko, V. O. |
title |
A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model. |
title_short |
A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model. |
title_full |
A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model. |
title_fullStr |
A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model. |
title_full_unstemmed |
A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model. |
title_sort |
kinetic energy budget and internal instabilities in the fine resolution antarctic model. |
publisher |
HAL CCSD |
publishDate |
1997 |
url |
https://hal.science/hal-00268272 https://doi.org/10.1175/1520-0485(1997)027<0005:AKEBAI>2.0.CO;2 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.science/hal-00268272 Journal of Physical Oceanography, 1997, 27 (1), pp.5-22. ⟨10.1175/1520-0485(1997)0272.0.CO;2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0485(1997)027<0005:AKEBAI>2.0.CO;2 hal-00268272 https://hal.science/hal-00268272 doi:10.1175/1520-0485(1997)027<0005:AKEBAI>2.0.CO;2 |
op_doi |
https://doi.org/10.1175/1520-0485(1997)027<0005:AKEBAI>2.0.CO;210.1175/1520-0485(1997)0272.0.CO;2 |
_version_ |
1785541683544326144 |