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Abstract:

Southern Hemisphere (SH) circulation conditions during austral springs of ENSO events we examined. Based on previous knowledge that SST variations over the subtropical south-central Pacific (SSCP) region are linked to differences among El Niño (EN) events, a stratification of the springs associated with EN events was performed according to SST conditions over the El Niño-3.4 sector and over the SSCP region. The EN events associated with cold conditions in the SSCP (WC) exhibit enhanced convection not only in the intertropical convergence zone over the central equatorial Pacific but also in the South Pacific convergence zone (SPCZ) extended southeastward into the subtropical regions. The resulting heating forcing intensifies a localized overturning cell, which is associated with an anomalous Rossby wave source in the central South Pacific extratropical region. Neither the Rossby wave source nor the associated wave pattern is evident during EN events associated with warm conditions in the SSCP and inactive SPCZ (WW). The basic features that characterize the differences in the EN response over the South Pacific can also be identified through the analysis of the SPCZ activity over the central South Pacific. The fact that variations in SPCZ activity lead SST anomaly changes in the SSCP would indicate that the differences in the EN response over the SH might be mainly driven by atmospheric changes, which induces extratropical SST anomalies. The differences in the circulation anomalies that characterize both types of EN response over the SH were further explored through the analysis of the activity of the three leading modes of circulation variability. The combined effect of the three leading patterns describes in some extent the intensification (weakening) of the cyclonic circulation anomaly observed over the southeastern Pacific in WC (WW), associated with an active (inactive) SPCZ. In particular, the interdecadal variability observed in the Pacific by many previous studies influences the circulation response to ENSO over the SH, mainly through changes in the activity of the SH annular mode. © 2004 American Meteorological Society.

Registro:

Documento: Artículo
Título:Differences in El Niño response over the Southern Hemisphere
Autor:Vera, C.; Silvestri, G.; Barros, V.; Carril, A.
Filiación:CIMA/Consejo Nac. Invest. Cien., Depto. de Cie. de Atmosfera/Oceanos, Universidad de Buenos Aires, Buenos Aires 1428, Argentina
Consejo Nac. Invest. Cien./Tecnicas, Buenos Aires, Argentina
Depto. de Cie. de Atmosfera/Oceanos, Universidad de Buenos Aires, Consejo Nac. Invest. Cien./Tecnicas, Buenos Aires, Argentina
Ist. Naz. di Geofis. e Vulcanologia, Bologna, Italy
Palabras clave:Atmospherics; Climate change; Heat convection; Storms; Thermal stratification; Tropics; Atmospheric changes; Austral springs; Intensification; Southern Hemisphere; Climatology; air-sea interaction; atmospheric circulation; decadal variation; El Nino; intertropical convergence zone; oceanic circulation; sea surface temperature; Southern Hemisphere; Pacific Ocean
Año:2004
Volumen:17
Número:9
Página de inicio:1741
Página de fin:1753
DOI: http://dx.doi.org/10.1175/1520-0442(2004)017<1741:DIENRO>2.0.CO;2
Título revista:Journal of Climate
Título revista abreviado:J. Clim.
ISSN:08948755
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08948755_v17_n9_p1741_Vera

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Citas:

---------- APA ----------
Vera, C., Silvestri, G., Barros, V. & Carril, A. (2004) . Differences in El Niño response over the Southern Hemisphere. Journal of Climate, 17(9), 1741-1753.
http://dx.doi.org/10.1175/1520-0442(2004)017<1741:DIENRO>2.0.CO;2
---------- CHICAGO ----------
Vera, C., Silvestri, G., Barros, V., Carril, A. "Differences in El Niño response over the Southern Hemisphere" . Journal of Climate 17, no. 9 (2004) : 1741-1753.
http://dx.doi.org/10.1175/1520-0442(2004)017<1741:DIENRO>2.0.CO;2
---------- MLA ----------
Vera, C., Silvestri, G., Barros, V., Carril, A. "Differences in El Niño response over the Southern Hemisphere" . Journal of Climate, vol. 17, no. 9, 2004, pp. 1741-1753.
http://dx.doi.org/10.1175/1520-0442(2004)017<1741:DIENRO>2.0.CO;2
---------- VANCOUVER ----------
Vera, C., Silvestri, G., Barros, V., Carril, A. Differences in El Niño response over the Southern Hemisphere. J. Clim. 2004;17(9):1741-1753.
http://dx.doi.org/10.1175/1520-0442(2004)017<1741:DIENRO>2.0.CO;2