Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current"
In this paper we present a simple analytical model for low frequency and large scale variability of the Antarctic Circumpolar Current (ACC). The physical mechanism of the variability is related to temporal and spatial variations of the cyclonic mean flow (ACC) due to circularly propagating nonlinear...
Published in: | Nonlinear Processes in Geophysics |
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Online Access: | https://doi.org/10.5194/npg-18-361-2011 https://npg.copernicus.org/articles/18/361/2011/ |
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ftcopernicus:oai:publications.copernicus.org:npg10591 2023-05-15T13:36:36+02:00 Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current" Derzho, O. G. Young, B. 2018-01-15 application/pdf https://doi.org/10.5194/npg-18-361-2011 https://npg.copernicus.org/articles/18/361/2011/ eng eng doi:10.5194/npg-18-361-2011 https://npg.copernicus.org/articles/18/361/2011/ eISSN: 1607-7946 Text 2018 ftcopernicus https://doi.org/10.5194/npg-18-361-2011 2020-07-20T16:26:07Z In this paper we present a simple analytical model for low frequency and large scale variability of the Antarctic Circumpolar Current (ACC). The physical mechanism of the variability is related to temporal and spatial variations of the cyclonic mean flow (ACC) due to circularly propagating nonlinear barotropic Rossby wave trains. It is shown that the Rossby wave train is a fundamental mode, trapped between the major fronts in the ACC. The Rossby waves are predicted to rotate with a particular angular velocity that depends on the magnitude and width of the mean current. The spatial structure of the rotating pattern, including its zonal wave number, is defined by the specific form of the stream function-vorticity relation. The similarity between the simulated patterns and the Antarctic Circumpolar Wave (ACW) is highlighted. The model can predict the observed sequence of warm and cold patches in the ACW as well as its zonal number. Text Antarc* Antarctic Copernicus Publications: E-Journals Antarctic The Antarctic Nonlinear Processes in Geophysics 18 3 361 365 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
In this paper we present a simple analytical model for low frequency and large scale variability of the Antarctic Circumpolar Current (ACC). The physical mechanism of the variability is related to temporal and spatial variations of the cyclonic mean flow (ACC) due to circularly propagating nonlinear barotropic Rossby wave trains. It is shown that the Rossby wave train is a fundamental mode, trapped between the major fronts in the ACC. The Rossby waves are predicted to rotate with a particular angular velocity that depends on the magnitude and width of the mean current. The spatial structure of the rotating pattern, including its zonal wave number, is defined by the specific form of the stream function-vorticity relation. The similarity between the simulated patterns and the Antarctic Circumpolar Wave (ACW) is highlighted. The model can predict the observed sequence of warm and cold patches in the ACW as well as its zonal number. |
format |
Text |
author |
Derzho, O. G. Young, B. |
spellingShingle |
Derzho, O. G. Young, B. Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current" |
author_facet |
Derzho, O. G. Young, B. |
author_sort |
Derzho, O. G. |
title |
Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current" |
title_short |
Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current" |
title_full |
Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current" |
title_fullStr |
Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current" |
title_full_unstemmed |
Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current" |
title_sort |
brief communication "on one mechanism of low frequency variability of the antarctic circumpolar current" |
publishDate |
2018 |
url |
https://doi.org/10.5194/npg-18-361-2011 https://npg.copernicus.org/articles/18/361/2011/ |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
eISSN: 1607-7946 |
op_relation |
doi:10.5194/npg-18-361-2011 https://npg.copernicus.org/articles/18/361/2011/ |
op_doi |
https://doi.org/10.5194/npg-18-361-2011 |
container_title |
Nonlinear Processes in Geophysics |
container_volume |
18 |
container_issue |
3 |
container_start_page |
361 |
op_container_end_page |
365 |
_version_ |
1766081303318364160 |