The influence of the tropical and subtropical Atlantic and Pacific Oceans on precipitation variability over southern central South America on seasonal time scales

This paper studies the temporal and spatial patterns of precipitation anomalies over southern central South America (SCSA: 22-40°S and 54-70°W), and their relationship with the sea-surface temperature (SST) variability over the surrounding tropical and subtropical Atlantic and Pacific Oceans. The da...

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Detalles Bibliográficos
Publicado: 2004
Materias:
Canonical correlation analysis
Precipitation
Sea-surface temperature
Southern South America
Data reduction
Functions
Oceanography
Precipitation (meteorology)
Temperature measurement
Precipitation anomalies
Sea-surface temperature (SST)
Climatology
atmosphere-ocean coupling
canonical analysis
precipitation (climatology)
principal component analysis
sea surface temperature
seasonal variation
spatial variation
Atlantic Ocean
Pacific Ocean
South America
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v24_n4_p415_Berri
http://hdl.handle.net/20.500.12110/paper_08998418_v24_n4_p415_Berri
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08998418_v24_n4_p415_Berri
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spelling paper:paper_08998418_v24_n4_p415_Berri2023-06-08T15:49:37Z The influence of the tropical and subtropical Atlantic and Pacific Oceans on precipitation variability over southern central South America on seasonal time scales Canonical correlation analysis Precipitation Sea-surface temperature Southern South America Data reduction Functions Oceanography Precipitation (meteorology) Temperature measurement Precipitation anomalies Sea-surface temperature (SST) Climatology atmosphere-ocean coupling canonical analysis precipitation (climatology) principal component analysis sea surface temperature seasonal variation spatial variation Atlantic Ocean Pacific Ocean South America This paper studies the temporal and spatial patterns of precipitation anomalies over southern central South America (SCSA: 22-40°S and 54-70°W), and their relationship with the sea-surface temperature (SST) variability over the surrounding tropical and subtropical Atlantic and Pacific Oceans. The data include monthly precipitation from 68 weather stations in central-northern Argentina and neighbouring Brazil. Paraguay and Uruguay, and monthly SSTs from the NOAA dataset with a 2° resolution for the period 1961-93. We use the method of canonical correlation analysis (CCA) to study the simultaneous relationship between bi-monthly precipitation and SST variability. Before applying the CCA procedure, standardized anomalies are calculated and a prefiltering is applied by means of an empirical orthogonal function (EOF) analysis. Thus, the CCA input consists of 10 EOF modes of SST and between 9 and 11 modes for precipitation and their corresponding principal components, which are the minimum number of modes necessary to explain at least 80% of the variance of the corresponding field. The results show that November-December presents the most robust association between the SST and SCSA precipitation variability, especially in northeastern Argentina and southern Brazil, followed by March-April and May-June. The period January-February, in contrast, displays a weak relationship with the oceans and represents a temporal minimum of oceanic influence during the summer semester. Based on the CCA maps, we identify the different oceanic and SCSA regions, the regional averages of SST and precipitation are calculated, and linear correlation analysis are conducted. The periods with greater association between the oceans and SCSA precipitation are November-December and May-June. During November-December, every selected region over SCSA reflects the influence of several oceanic regions, whereas during May-June only a few regions show a direct association with the oceans. The Pacific Ocean regions have a greater influence and are more widespread over SCSA; the Atlantic Ocean regions have an influence only over the northwestern and the southeastern parts of SCSA. In general, the relationship with the equatorial and tropical Atlantic and Pacific Oceans is of the type warm-wet/cold-dry, whereas the subtropical regions of both oceans show the opposite relationship, i.e. warm-dry/cold-wet. © 2004 Royal Meteorological Society. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v24_n4_p415_Berri http://hdl.handle.net/20.500.12110/paper_08998418_v24_n4_p415_Berri
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Canonical correlation analysis
Precipitation
Sea-surface temperature
Southern South America
Data reduction
Functions
Oceanography
Precipitation (meteorology)
Temperature measurement
Precipitation anomalies
Sea-surface temperature (SST)
Climatology
atmosphere-ocean coupling
canonical analysis
precipitation (climatology)
principal component analysis
sea surface temperature
seasonal variation
spatial variation
Atlantic Ocean
Pacific Ocean
South America
spellingShingle Canonical correlation analysis
Precipitation
Sea-surface temperature
Southern South America
Data reduction
Functions
Oceanography
Precipitation (meteorology)
Temperature measurement
Precipitation anomalies
Sea-surface temperature (SST)
Climatology
atmosphere-ocean coupling
canonical analysis
precipitation (climatology)
principal component analysis
sea surface temperature
seasonal variation
spatial variation
Atlantic Ocean
Pacific Ocean
South America
The influence of the tropical and subtropical Atlantic and Pacific Oceans on precipitation variability over southern central South America on seasonal time scales
topic_facet Canonical correlation analysis
Precipitation
Sea-surface temperature
Southern South America
Data reduction
Functions
Oceanography
Precipitation (meteorology)
Temperature measurement
Precipitation anomalies
Sea-surface temperature (SST)
Climatology
atmosphere-ocean coupling
canonical analysis
precipitation (climatology)
principal component analysis
sea surface temperature
seasonal variation
spatial variation
Atlantic Ocean
Pacific Ocean
South America
description This paper studies the temporal and spatial patterns of precipitation anomalies over southern central South America (SCSA: 22-40°S and 54-70°W), and their relationship with the sea-surface temperature (SST) variability over the surrounding tropical and subtropical Atlantic and Pacific Oceans. The data include monthly precipitation from 68 weather stations in central-northern Argentina and neighbouring Brazil. Paraguay and Uruguay, and monthly SSTs from the NOAA dataset with a 2° resolution for the period 1961-93. We use the method of canonical correlation analysis (CCA) to study the simultaneous relationship between bi-monthly precipitation and SST variability. Before applying the CCA procedure, standardized anomalies are calculated and a prefiltering is applied by means of an empirical orthogonal function (EOF) analysis. Thus, the CCA input consists of 10 EOF modes of SST and between 9 and 11 modes for precipitation and their corresponding principal components, which are the minimum number of modes necessary to explain at least 80% of the variance of the corresponding field. The results show that November-December presents the most robust association between the SST and SCSA precipitation variability, especially in northeastern Argentina and southern Brazil, followed by March-April and May-June. The period January-February, in contrast, displays a weak relationship with the oceans and represents a temporal minimum of oceanic influence during the summer semester. Based on the CCA maps, we identify the different oceanic and SCSA regions, the regional averages of SST and precipitation are calculated, and linear correlation analysis are conducted. The periods with greater association between the oceans and SCSA precipitation are November-December and May-June. During November-December, every selected region over SCSA reflects the influence of several oceanic regions, whereas during May-June only a few regions show a direct association with the oceans. The Pacific Ocean regions have a greater influence and are more widespread over SCSA; the Atlantic Ocean regions have an influence only over the northwestern and the southeastern parts of SCSA. In general, the relationship with the equatorial and tropical Atlantic and Pacific Oceans is of the type warm-wet/cold-dry, whereas the subtropical regions of both oceans show the opposite relationship, i.e. warm-dry/cold-wet. © 2004 Royal Meteorological Society.
title The influence of the tropical and subtropical Atlantic and Pacific Oceans on precipitation variability over southern central South America on seasonal time scales
title_short The influence of the tropical and subtropical Atlantic and Pacific Oceans on precipitation variability over southern central South America on seasonal time scales
title_full The influence of the tropical and subtropical Atlantic and Pacific Oceans on precipitation variability over southern central South America on seasonal time scales
title_fullStr The influence of the tropical and subtropical Atlantic and Pacific Oceans on precipitation variability over southern central South America on seasonal time scales
title_full_unstemmed The influence of the tropical and subtropical Atlantic and Pacific Oceans on precipitation variability over southern central South America on seasonal time scales
title_sort influence of the tropical and subtropical atlantic and pacific oceans on precipitation variability over southern central south america on seasonal time scales
publishDate 2004
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v24_n4_p415_Berri
http://hdl.handle.net/20.500.12110/paper_08998418_v24_n4_p415_Berri
_version_ 1768543140852006912

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