Precipitation response to El Niño/La Niña events in Southern South America - Emphasis in regional drought occurrences

The ENSO phenomenon is one of the key factors that influence the interannual variability of precipitation over Southern South America. The aim of this study is to identify the regional response of precipitation to El Niño/La Niña events, with emphasis in drought conditions. The standardized precipit...

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Detalles Bibliográficos
Autor principal: Penalba, Olga C.
Publicado: 2016
Materias:
annual variation
climate modeling
drought
El Nino
El Nino-Southern Oscillation
La Nina
precipitation (climatology)
principal component analysis
regional climate
South America
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16807340_v42_n_p1_Penalba
http://hdl.handle.net/20.500.12110/paper_16807340_v42_n_p1_Penalba
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_16807340_v42_n_p1_Penalba
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spelling paper:paper_16807340_v42_n_p1_Penalba2023-06-08T16:26:40Z Precipitation response to El Niño/La Niña events in Southern South America - Emphasis in regional drought occurrences Penalba, Olga C. annual variation climate modeling drought El Nino El Nino-Southern Oscillation La Nina precipitation (climatology) principal component analysis regional climate South America The ENSO phenomenon is one of the key factors that influence the interannual variability of precipitation over Southern South America. The aim of this study is to identify the regional response of precipitation to El Niño/La Niña events, with emphasis in drought conditions. The standardized precipitation index (SPI) was used to characterize precipitation variabilities through the 1961-2008 period for time scales of 3 (SPI3) and 12 (SPI12) months. A regionalization based on rotated principal component analysis allowed to identify seven coherent regions for each of the time scales considered. In order to identify the regional influence of El Niño and La Niña events on the SPI time series, we calculated the mean SPI values for the El Niño and La Niña years and assessed its significance through bootstrap analysis. We found coherent and significant SPI responses to ENSO phases in most of the seven regions considered, mainly for the SPI12 time series. The precipitation response to La Niña events is characterized with regional deficits, identified with negative values of the SPI during the end of La Niña year and the year after. During El Niño events the precipitation response is reversed and more intense/consistent than in the case of La Niña events. This signal has some regional differences regarding its magnitude and timing, and the quantification of these features, together with the assessment of the SST composites during drought conditions provided critical baseline information for the agricultural and water resources sectors. © 2016 Author(s). Fil:Penalba, O.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16807340_v42_n_p1_Penalba http://hdl.handle.net/20.500.12110/paper_16807340_v42_n_p1_Penalba
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic annual variation
climate modeling
drought
El Nino
El Nino-Southern Oscillation
La Nina
precipitation (climatology)
principal component analysis
regional climate
South America
spellingShingle annual variation
climate modeling
drought
El Nino
El Nino-Southern Oscillation
La Nina
precipitation (climatology)
principal component analysis
regional climate
South America
Penalba, Olga C.
Precipitation response to El Niño/La Niña events in Southern South America - Emphasis in regional drought occurrences
topic_facet annual variation
climate modeling
drought
El Nino
El Nino-Southern Oscillation
La Nina
precipitation (climatology)
principal component analysis
regional climate
South America
description The ENSO phenomenon is one of the key factors that influence the interannual variability of precipitation over Southern South America. The aim of this study is to identify the regional response of precipitation to El Niño/La Niña events, with emphasis in drought conditions. The standardized precipitation index (SPI) was used to characterize precipitation variabilities through the 1961-2008 period for time scales of 3 (SPI3) and 12 (SPI12) months. A regionalization based on rotated principal component analysis allowed to identify seven coherent regions for each of the time scales considered. In order to identify the regional influence of El Niño and La Niña events on the SPI time series, we calculated the mean SPI values for the El Niño and La Niña years and assessed its significance through bootstrap analysis. We found coherent and significant SPI responses to ENSO phases in most of the seven regions considered, mainly for the SPI12 time series. The precipitation response to La Niña events is characterized with regional deficits, identified with negative values of the SPI during the end of La Niña year and the year after. During El Niño events the precipitation response is reversed and more intense/consistent than in the case of La Niña events. This signal has some regional differences regarding its magnitude and timing, and the quantification of these features, together with the assessment of the SST composites during drought conditions provided critical baseline information for the agricultural and water resources sectors. © 2016 Author(s).
author Penalba, Olga C.
author_facet Penalba, Olga C.
author_sort Penalba, Olga C.
title Precipitation response to El Niño/La Niña events in Southern South America - Emphasis in regional drought occurrences
title_short Precipitation response to El Niño/La Niña events in Southern South America - Emphasis in regional drought occurrences
title_full Precipitation response to El Niño/La Niña events in Southern South America - Emphasis in regional drought occurrences
title_fullStr Precipitation response to El Niño/La Niña events in Southern South America - Emphasis in regional drought occurrences
title_full_unstemmed Precipitation response to El Niño/La Niña events in Southern South America - Emphasis in regional drought occurrences
title_sort precipitation response to el niño/la niña events in southern south america - emphasis in regional drought occurrences
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16807340_v42_n_p1_Penalba
http://hdl.handle.net/20.500.12110/paper_16807340_v42_n_p1_Penalba
work_keys_str_mv AT penalbaolgac precipitationresponsetoelninolaninaeventsinsouthernsouthamericaemphasisinregionaldroughtoccurrences
_version_ 1768545162788601856

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