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...
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2011-06-01
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Series: | Nonlinear Processes in Geophysics |
Online Access: | http://www.nonlin-processes-geophys.net/18/361/2011/npg-18-361-2011.pdf |
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doaj-9da747c870b3433a9d02f4a786be441c2020-11-25T00:03:04ZengCopernicus PublicationsNonlinear Processes in Geophysics1023-58091607-79462011-06-0118336136510.5194/npg-18-361-2011Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current"O. G. DerzhoB. de YoungIn 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.http://www.nonlin-processes-geophys.net/18/361/2011/npg-18-361-2011.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
O. G. Derzho B. de Young |
spellingShingle |
O. G. Derzho B. de Young Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current" Nonlinear Processes in Geophysics |
author_facet |
O. G. Derzho B. de Young |
author_sort |
O. G. Derzho |
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" |
publisher |
Copernicus Publications |
series |
Nonlinear Processes in Geophysics |
issn |
1023-5809 1607-7946 |
publishDate |
2011-06-01 |
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. |
url |
http://www.nonlin-processes-geophys.net/18/361/2011/npg-18-361-2011.pdf |
work_keys_str_mv |
AT ogderzho briefcommunicationononemechanismoflowfrequencyvariabilityoftheantarcticcircumpolarcurrent AT bdeyoung briefcommunicationononemechanismoflowfrequencyvariabilityoftheantarcticcircumpolarcurrent |
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