Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America

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...

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Autores principales: Barros, V., Gonzalez, M., Liebmann, B., Camilloni, I.
Formato: JOUR
Materias:
air-sea interaction
rainfall
sea surface temperature
seasonal variation
(South)
Atlantic Ocean
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0177798X_v67_n3-4_p123_Barros
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0177798X_v67_n3-4_p123_Barros
record_format dspace
spelling todo:paper_0177798X_v67_n3-4_p123_Barros2023-10-03T15:08:13Z Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America Barros, V. Gonzalez, M. Liebmann, B. Camilloni, I. air-sea interaction rainfall sea surface temperature seasonal variation (South) Atlantic Ocean South America 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0177798X_v67_n3-4_p123_Barros
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic air-sea interaction
rainfall
sea surface temperature
seasonal variation
(South)
Atlantic Ocean
South America
spellingShingle air-sea interaction
rainfall
sea surface temperature
seasonal variation
(South)
Atlantic Ocean
South America
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
topic_facet air-sea interaction
rainfall
sea surface temperature
seasonal variation
(South)
Atlantic Ocean
South America
description 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.
format JOUR
author Barros, V.
Gonzalez, M.
Liebmann, B.
Camilloni, I.
author_facet Barros, V.
Gonzalez, M.
Liebmann, B.
Camilloni, I.
author_sort Barros, V.
title Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America
title_short Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America
title_full Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America
title_fullStr Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America
title_full_unstemmed Influence of the South Atlantic convergence zone and South Atlantic Sea surface temperature on interannual summer rainfall variability in Southeastern South America
title_sort influence of the south atlantic convergence zone and south atlantic sea surface temperature on interannual summer rainfall variability in southeastern south america
url http://hdl.handle.net/20.500.12110/paper_0177798X_v67_n3-4_p123_Barros
work_keys_str_mv AT barrosv influenceofthesouthatlanticconvergencezoneandsouthatlanticseasurfacetemperatureoninterannualsummerrainfallvariabilityinsoutheasternsouthamerica
AT gonzalezm influenceofthesouthatlanticconvergencezoneandsouthatlanticseasurfacetemperatureoninterannualsummerrainfallvariabilityinsoutheasternsouthamerica
AT liebmannb influenceofthesouthatlanticconvergencezoneandsouthatlanticseasurfacetemperatureoninterannualsummerrainfallvariabilityinsoutheasternsouthamerica
AT camillonii influenceofthesouthatlanticconvergencezoneandsouthatlanticseasurfacetemperatureoninterannualsummerrainfallvariabilityinsoutheasternsouthamerica
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