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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Bibliographic Details
Published inAtmospheric science letters Vol. 12; no. 4; pp. 368 - 374
Main Authors Barbosa, T. F., Rao, V. B., Cavalcanti, I. F. A.
Format Journal Article
LanguageEnglish
Published Chichester, UK John Wiley & Sons, Ltd 01.10.2011
John Wiley & Sons, Inc
Subjects
Atmospheric sciences
Climate science
El Nino
El Nino phenomena
El Niño‐Southern Oscillation
Interannual variability
Intrusion
La Nina
Potential vorticity
Precipitation
Quasi-stationary waves
Rossby waves breaking
Southern Oscillation
Southern Oscillation Index
Standing waves
Stratosphere
Tropical environments
Variability
Vorticity
AS, South Atlantic
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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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ISSN:1530-261X
1530-261X
DOI:10.1002/asl.352