Warm and cold events in Argentina and their relationship with South Atlantic and South Pacific Sea surface temperatures

A Singular Value Decomposition (SVD) analysis was performed jointly on extreme temperature events in Argentina and sea surface temperature (SST) in the South Atlantic and South Pacific. Sea level pressure (SLP) patterns associated with the first SVD coupled mode were also analyzed. Winter is the sea...

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Detalles Bibliográficos
Autores principales: Rusticucci, Matilde, Vargas, Walter Mario
Publicado: 2003
Materias:
Argentina
Extreme temperature events
South Atlantic
South Pacific
climate variation
El Nino
sea level pressure
sea surface temperature
Atlantic Ocean
Atlantic Ocean (South)
Pacific Ocean
Pacific Ocean (South)
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v108_n11_p20_Rusticucci
http://hdl.handle.net/20.500.12110/paper_01480227_v108_n11_p20_Rusticucci
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01480227_v108_n11_p20_Rusticucci
record_format dspace
spelling paper:paper_01480227_v108_n11_p20_Rusticucci2023-06-08T15:13:04Z Warm and cold events in Argentina and their relationship with South Atlantic and South Pacific Sea surface temperatures Rusticucci, Matilde Vargas, Walter Mario Argentina Extreme temperature events South Atlantic South Pacific climate variation El Nino sea level pressure sea surface temperature Atlantic Ocean Atlantic Ocean (South) Pacific Ocean Pacific Ocean (South) A Singular Value Decomposition (SVD) analysis was performed jointly on extreme temperature events in Argentina and sea surface temperature (SST) in the South Atlantic and South Pacific. Sea level pressure (SLP) patterns associated with the first SVD coupled mode were also analyzed. Winter is the season of the year that is best represented by the first mode, accounting for up to 70% of the winter covariance between temperature events and SST. The warm and cold events in Argentina are essentially a consequence of the creation of meridional atmospheric circulations over the continent. Such atmospheric patterns result from displacements and intensity changes of the subtropical anticyclones over the oceans and of the continental low-pressure center in northwestern Argentina. The temperature events in southern Argentina are also closely related to the warming and cooling of the coastal waters in the South Atlantic and South Pacific. The analysis suggests that in summer and winter, high (low) occurrence of warm events and low (high) occurrence of cold events are related to similar oceanic and atmospheric circulation situations. The temperature events in Argentina show higher correlation with the Atlantic than with the Pacific, which reflects the importance of the "orographic barrier" of the Andes Mountains in driving the atmospheric circulation. The only exception to this rule concerns the warm events in spring, for which the warming of the equatorial Pacific (the ENSO pattern) appears as the dominant mode. The temporal patterns of the temperature events in Argentina exhibit significant interannual variability in fall, winter, and spring, with periods of 3 to 5 years. The summer patterns suggest a very low-frequency variation with a period longer than 20 years. Copyright 2003 by the American Geophysical Union. Fil:Rusticucci, M.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vargas, W.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v108_n11_p20_Rusticucci http://hdl.handle.net/20.500.12110/paper_01480227_v108_n11_p20_Rusticucci
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Extreme temperature events
South Atlantic
South Pacific
climate variation
El Nino
sea level pressure
sea surface temperature
Atlantic Ocean
Atlantic Ocean (South)
Pacific Ocean
Pacific Ocean (South)
spellingShingle Argentina
Extreme temperature events
South Atlantic
South Pacific
climate variation
El Nino
sea level pressure
sea surface temperature
Atlantic Ocean
Atlantic Ocean (South)
Pacific Ocean
Pacific Ocean (South)
Rusticucci, Matilde
Vargas, Walter Mario
Warm and cold events in Argentina and their relationship with South Atlantic and South Pacific Sea surface temperatures
topic_facet Argentina
Extreme temperature events
South Atlantic
South Pacific
climate variation
El Nino
sea level pressure
sea surface temperature
Atlantic Ocean
Atlantic Ocean (South)
Pacific Ocean
Pacific Ocean (South)
description A Singular Value Decomposition (SVD) analysis was performed jointly on extreme temperature events in Argentina and sea surface temperature (SST) in the South Atlantic and South Pacific. Sea level pressure (SLP) patterns associated with the first SVD coupled mode were also analyzed. Winter is the season of the year that is best represented by the first mode, accounting for up to 70% of the winter covariance between temperature events and SST. The warm and cold events in Argentina are essentially a consequence of the creation of meridional atmospheric circulations over the continent. Such atmospheric patterns result from displacements and intensity changes of the subtropical anticyclones over the oceans and of the continental low-pressure center in northwestern Argentina. The temperature events in southern Argentina are also closely related to the warming and cooling of the coastal waters in the South Atlantic and South Pacific. The analysis suggests that in summer and winter, high (low) occurrence of warm events and low (high) occurrence of cold events are related to similar oceanic and atmospheric circulation situations. The temperature events in Argentina show higher correlation with the Atlantic than with the Pacific, which reflects the importance of the "orographic barrier" of the Andes Mountains in driving the atmospheric circulation. The only exception to this rule concerns the warm events in spring, for which the warming of the equatorial Pacific (the ENSO pattern) appears as the dominant mode. The temporal patterns of the temperature events in Argentina exhibit significant interannual variability in fall, winter, and spring, with periods of 3 to 5 years. The summer patterns suggest a very low-frequency variation with a period longer than 20 years. Copyright 2003 by the American Geophysical Union.
author Rusticucci, Matilde
Vargas, Walter Mario
author_facet Rusticucci, Matilde
Vargas, Walter Mario
author_sort Rusticucci, Matilde
title Warm and cold events in Argentina and their relationship with South Atlantic and South Pacific Sea surface temperatures
title_short Warm and cold events in Argentina and their relationship with South Atlantic and South Pacific Sea surface temperatures
title_full Warm and cold events in Argentina and their relationship with South Atlantic and South Pacific Sea surface temperatures
title_fullStr Warm and cold events in Argentina and their relationship with South Atlantic and South Pacific Sea surface temperatures
title_full_unstemmed Warm and cold events in Argentina and their relationship with South Atlantic and South Pacific Sea surface temperatures
title_sort warm and cold events in argentina and their relationship with south atlantic and south pacific sea surface temperatures
publishDate 2003
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v108_n11_p20_Rusticucci
http://hdl.handle.net/20.500.12110/paper_01480227_v108_n11_p20_Rusticucci
work_keys_str_mv AT rusticuccimatilde warmandcoldeventsinargentinaandtheirrelationshipwithsouthatlanticandsouthpacificseasurfacetemperatures
AT vargaswaltermario warmandcoldeventsinargentinaandtheirrelationshipwithsouthatlanticandsouthpacificseasurfacetemperatures
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