Interannual variability of high potential vorticity in South Atlantic
In this study, we examined intrusions of the high potential vorticity (HIGH‐PV) at the 350 K isentropic level over the South Atlantic during the period December–January–February (DJF) 1979–2001. These events have a large interannual variability and are negatively correlated with the Southern Oscilla...
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Published in | Atmospheric science letters Vol. 12; no. 4; pp. 368 - 374 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Chichester, UK
John Wiley & Sons, Ltd
01.10.2011
John Wiley & Sons, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | In this study, we examined intrusions of the high potential vorticity (HIGH‐PV) at the 350 K isentropic level over the South Atlantic during the period December–January–February (DJF) 1979–2001. These events have a large interannual variability and are negatively correlated with the Southern Oscillation Index. Many events occur during the El Niño years except in 1997/1998, while there are none or few cases in La Niña years except in 1988/1989. The intrusion events which show interactions between the tropics and extratropics are associated with the ‘westerly ducts’ in the tropics and also with the amplitude of quasi‐stationary waves and subtropical jet intensity. Copyright © 2011 Royal Meteorological Society |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1530-261X 1530-261X |
DOI: | 10.1002/asl.352 |