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Abstract:

In subtropical Argentina, Paraguay and southern Brazil, precipitation is most abundant during summer but its interannual variability is large. At this time a zone of low-level convergence, upper-level divergence, and intense convection is developed to the north of this area. This feature is known as the South Atlantic convergence zone (SACZ) and seems to be related to the interannual variability of summer rainfall to its south. The aim of this work is to document this relationship. Reduced (increased) precipitation in southern Brazil, most of Uruguay and northeastern Argentina is associated with a strong (weak) SACZ and a northward (southward) displacement of it, while increased (reduced) rainfall occurs further south in subtropical Argentina. Also, warm (cold) SST in the region 20° S-40° S and west of 30° W is likely accompanied by a southward (northward) shift of the SACZ. Aside of this relation with the SACZ that affect on the precipitation field of Southeastern South America, the proximate Atlantic Ocean SST seems to force the precipitation over this region by other mechanisms as well. The result of this additional SST forcing is to enhance the signal of the SACZ in northeastern Argentina, Uruguay and southern Brazil and to oppose the SACZ effect in southern subtropical Argentina.

Registro:

Documento: Artículo
Título:Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America
Autor:Barros, V.; Gonzalez, M.; Liebmann, B.; Camilloni, I.
Filiación:Department of Atmospheric Sciences, University of Buenos Aires, Argentina
CONICET, Argentina
NOAA, University of Colorado Climate Diagnostics Center, Boulder, CO, United States
Centro de Investigaciones del Mar y la Atmósfera (CIMA/CONICET-UBA), Argentina
Palabras clave:air-sea interaction; rainfall; sea surface temperature; seasonal variation; (South); Atlantic Ocean; South America
Año:2000
Volumen:67
Número:3-4
Página de inicio:123
Página de fin:133
DOI: http://dx.doi.org/10.1007/s007040070002
Título revista:Theoretical and Applied Climatology
Título revista abreviado:Theor. Appl. Climatol.
ISSN:0177798X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0177798X_v67_n3-4_p123_Barros

Referencias:

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Citas:

---------- APA ----------
Barros, V., Gonzalez, M., Liebmann, B. & Camilloni, I. (2000) . Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America. Theoretical and Applied Climatology, 67(3-4), 123-133.
http://dx.doi.org/10.1007/s007040070002
---------- CHICAGO ----------
Barros, V., Gonzalez, M., Liebmann, B., Camilloni, I. "Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America" . Theoretical and Applied Climatology 67, no. 3-4 (2000) : 123-133.
http://dx.doi.org/10.1007/s007040070002
---------- MLA ----------
Barros, V., Gonzalez, M., Liebmann, B., Camilloni, I. "Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America" . Theoretical and Applied Climatology, vol. 67, no. 3-4, 2000, pp. 123-133.
http://dx.doi.org/10.1007/s007040070002
---------- VANCOUVER ----------
Barros, V., Gonzalez, M., Liebmann, B., Camilloni, I. Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America. Theor. Appl. Climatol. 2000;67(3-4):123-133.
http://dx.doi.org/10.1007/s007040070002