Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation

The objective of this research is to study the main variability modes of the frequency of extreme temperatures in the south of South Amenica, their relation to sea surface temperatures (SSTs), and some indices of atmospheric circulation in the Southern Hemisphere. Observational data and reanalysis d...

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Autores principales: Barrucand, Mariana Graciela, Rusticucci, Matilde, Vargas, Walter Mario
Publicado: 2008
Materias:
Atmospheric movements
Atmospheric temperature
Coastal zones
Wavelet analysis
atmospheric circulation
baroclinic wave
coastal zone
observational method
periodicity
sea surface temperature
Southern Hemisphere
Atlantic Ocean
Atlantic Ocean (South)
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v113_n20_p_Barrucand
http://hdl.handle.net/20.500.12110/paper_01480227_v113_n20_p_Barrucand
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01480227_v113_n20_p_Barrucand
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spelling paper:paper_01480227_v113_n20_p_Barrucand2023-06-08T15:13:07Z Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation Barrucand, Mariana Graciela Rusticucci, Matilde Vargas, Walter Mario Atmospheric movements Atmospheric temperature Coastal zones Wavelet analysis atmospheric circulation baroclinic wave coastal zone observational method periodicity sea surface temperature Southern Hemisphere Atlantic Ocean Atlantic Ocean (South) The objective of this research is to study the main variability modes of the frequency of extreme temperatures in the south of South Amenica, their relation to sea surface temperatures (SSTs), and some indices of atmospheric circulation in the Southern Hemisphere. Observational data and reanalysis data were used for this purpose over the 1964-2003 period. An initial analysis showed that between the months of March and June, the frequency of wann events (especially warm nights) is highly associated with the SST in coastal zones. A wavelet analysis showed that the main variability mode found at a seasonal scale was an 8-year wave signal present in spning that remains active until the 1990s; it was noticeable in the analysis of cold nights, Atlantic SSTs, Pacific SSTs, and the Southern Annular Mode (SAM). A cross-wavelet analysis among them reflected this signal as a common variability mode, with the positive phase of the SAM congruent with the warmest conditions in the coastal zones of the Atlantic Ocean and lower cases with cold nights at the reference meteorological stations analyzed. Although longer series are desirable for low-frequency variability analysis, the results agree with previous studies that take into account an 8-year periodicity of the baroclinic waves at the Southern Hemisphere, supporting the relevance of the 8-year signal. Copyright 2008 by the American Geophysical Union. Fil:Barrucand, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rusticucci, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vargas, W. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v113_n20_p_Barrucand http://hdl.handle.net/20.500.12110/paper_01480227_v113_n20_p_Barrucand
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Atmospheric movements
Atmospheric temperature
Coastal zones
Wavelet analysis
atmospheric circulation
baroclinic wave
coastal zone
observational method
periodicity
sea surface temperature
Southern Hemisphere
Atlantic Ocean
Atlantic Ocean (South)
spellingShingle Atmospheric movements
Atmospheric temperature
Coastal zones
Wavelet analysis
atmospheric circulation
baroclinic wave
coastal zone
observational method
periodicity
sea surface temperature
Southern Hemisphere
Atlantic Ocean
Atlantic Ocean (South)
Barrucand, Mariana Graciela
Rusticucci, Matilde
Vargas, Walter Mario
Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation
topic_facet Atmospheric movements
Atmospheric temperature
Coastal zones
Wavelet analysis
atmospheric circulation
baroclinic wave
coastal zone
observational method
periodicity
sea surface temperature
Southern Hemisphere
Atlantic Ocean
Atlantic Ocean (South)
description The objective of this research is to study the main variability modes of the frequency of extreme temperatures in the south of South Amenica, their relation to sea surface temperatures (SSTs), and some indices of atmospheric circulation in the Southern Hemisphere. Observational data and reanalysis data were used for this purpose over the 1964-2003 period. An initial analysis showed that between the months of March and June, the frequency of wann events (especially warm nights) is highly associated with the SST in coastal zones. A wavelet analysis showed that the main variability mode found at a seasonal scale was an 8-year wave signal present in spning that remains active until the 1990s; it was noticeable in the analysis of cold nights, Atlantic SSTs, Pacific SSTs, and the Southern Annular Mode (SAM). A cross-wavelet analysis among them reflected this signal as a common variability mode, with the positive phase of the SAM congruent with the warmest conditions in the coastal zones of the Atlantic Ocean and lower cases with cold nights at the reference meteorological stations analyzed. Although longer series are desirable for low-frequency variability analysis, the results agree with previous studies that take into account an 8-year periodicity of the baroclinic waves at the Southern Hemisphere, supporting the relevance of the 8-year signal. Copyright 2008 by the American Geophysical Union.
author Barrucand, Mariana Graciela
Rusticucci, Matilde
Vargas, Walter Mario
author_facet Barrucand, Mariana Graciela
Rusticucci, Matilde
Vargas, Walter Mario
author_sort Barrucand, Mariana Graciela
title Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation
title_short Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation
title_full Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation
title_fullStr Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation
title_full_unstemmed Temperature extremes in the south of South America in relation to Atlantic Ocean surface temperature and Southern Hemisphere circulation
title_sort temperature extremes in the south of south america in relation to atlantic ocean surface temperature and southern hemisphere circulation
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v113_n20_p_Barrucand
http://hdl.handle.net/20.500.12110/paper_01480227_v113_n20_p_Barrucand
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AT rusticuccimatilde temperatureextremesinthesouthofsouthamericainrelationtoatlanticoceansurfacetemperatureandsouthernhemispherecirculation
AT vargaswaltermario temperatureextremesinthesouthofsouthamericainrelationtoatlanticoceansurfacetemperatureandsouthernhemispherecirculation
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