Interannual variations of storm tracks in the Southern Hemisphere and their connections with the Antarctic oscillation
Abstract Interannual variations of storm tracks in the Southern Hemisphere (SH) are studied. Large interannual variations are found in the enveloping function of meridional wind v e and these suggest some dominant periodicities. Some of these periodicities are a quasi‐biennial oscillation in the sub...
Published in: | International Journal of Climatology |
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crwiley:10.1002/joc.948 2024-06-02T07:57:47+00:00 Interannual variations of storm tracks in the Southern Hemisphere and their connections with the Antarctic oscillation Brahmananda Rao, V. do Carmo, Alexandre M. C. Franchito, Sergio H. 2003 http://dx.doi.org/10.1002/joc.948 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.948 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.948 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 23, issue 12, page 1537-1545 ISSN 0899-8418 1097-0088 journal-article 2003 crwiley https://doi.org/10.1002/joc.948 2024-05-03T10:36:43Z Abstract Interannual variations of storm tracks in the Southern Hemisphere (SH) are studied. Large interannual variations are found in the enveloping function of meridional wind v e and these suggest some dominant periodicities. Some of these periodicities are a quasi‐biennial oscillation in the subtropical branch of the winter storm track and the midlatitude spring storm track, a 3 year period and a long period of 8 years. The Antarctic oscillation (AAO) seems to be connected to the interannual variation of storm tracks in the SH. A significant negative correlation between v e and the AAO index in the high latitudes, a positive correlation in the midlatitudes and again a negative correlation in the subtropics are found throughout the year. During the high index phase of the AAO, the low‐level zonal wind shear increases in the region of midlatitude storm tracks and the static stability decreases, increasing the growth rate of baroclinic eddies, i.e. increase of v e (the opposite occurs during the negative phase). This explains the positive correlation in the midlatitudes between v e and the AAO index. In the region of the subtropical storm track during the high index phase the wind shear decreases and the static stability increases, decreasing the growth rates, thus explaining the negative correlation between v e and the AAO index. Copyright © 2003 Royal Meteorological Society Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library Antarctic The Antarctic International Journal of Climatology 23 12 1537 1545 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Interannual variations of storm tracks in the Southern Hemisphere (SH) are studied. Large interannual variations are found in the enveloping function of meridional wind v e and these suggest some dominant periodicities. Some of these periodicities are a quasi‐biennial oscillation in the subtropical branch of the winter storm track and the midlatitude spring storm track, a 3 year period and a long period of 8 years. The Antarctic oscillation (AAO) seems to be connected to the interannual variation of storm tracks in the SH. A significant negative correlation between v e and the AAO index in the high latitudes, a positive correlation in the midlatitudes and again a negative correlation in the subtropics are found throughout the year. During the high index phase of the AAO, the low‐level zonal wind shear increases in the region of midlatitude storm tracks and the static stability decreases, increasing the growth rate of baroclinic eddies, i.e. increase of v e (the opposite occurs during the negative phase). This explains the positive correlation in the midlatitudes between v e and the AAO index. In the region of the subtropical storm track during the high index phase the wind shear decreases and the static stability increases, decreasing the growth rates, thus explaining the negative correlation between v e and the AAO index. Copyright © 2003 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Brahmananda Rao, V. do Carmo, Alexandre M. C. Franchito, Sergio H. |
spellingShingle |
Brahmananda Rao, V. do Carmo, Alexandre M. C. Franchito, Sergio H. Interannual variations of storm tracks in the Southern Hemisphere and their connections with the Antarctic oscillation |
author_facet |
Brahmananda Rao, V. do Carmo, Alexandre M. C. Franchito, Sergio H. |
author_sort |
Brahmananda Rao, V. |
title |
Interannual variations of storm tracks in the Southern Hemisphere and their connections with the Antarctic oscillation |
title_short |
Interannual variations of storm tracks in the Southern Hemisphere and their connections with the Antarctic oscillation |
title_full |
Interannual variations of storm tracks in the Southern Hemisphere and their connections with the Antarctic oscillation |
title_fullStr |
Interannual variations of storm tracks in the Southern Hemisphere and their connections with the Antarctic oscillation |
title_full_unstemmed |
Interannual variations of storm tracks in the Southern Hemisphere and their connections with the Antarctic oscillation |
title_sort |
interannual variations of storm tracks in the southern hemisphere and their connections with the antarctic oscillation |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1002/joc.948 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.948 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.948 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
International Journal of Climatology volume 23, issue 12, page 1537-1545 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.948 |
container_title |
International Journal of Climatology |
container_volume |
23 |
container_issue |
12 |
container_start_page |
1537 |
op_container_end_page |
1545 |
_version_ |
1800740980455899136 |