Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset

The ability of coupled climate models from the WCRP-CMIP3 multi-model dataset to reproduce the interannual seasonal variability of precipitation in South America and the influence of the Southern Annular Mode (SAM) and El Niño-Southern Oscillation (ENSO) on such variability is examined. Models are a...

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Autores principales:	Vera, Carolina Susana, Silvestri, Gabriel Emilio
Publicado:	2009
Materias:	Coupled climate models ENSO events South American climate Southern Annular Mode WCRP-CMIP3 multi-model dataset annual variation climate modeling climate variation data set El Nino-Southern Oscillation precipitation (climatology) seasonal variation Southern Hemisphere teleconnection Chile South America
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v32_n7-8_p1003_Vera http://hdl.handle.net/20.500.12110/paper_09307575_v32_n7-8_p1003_Vera
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09307575_v32_n7-8_p1003_Vera
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spelling	paper:paper_09307575_v32_n7-8_p1003_Vera2023-06-08T15:52:39Z Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset Vera, Carolina Susana Silvestri, Gabriel Emilio Coupled climate models ENSO events South American climate Southern Annular Mode WCRP-CMIP3 multi-model dataset annual variation climate modeling climate variation data set El Nino-Southern Oscillation precipitation (climatology) seasonal variation Southern Hemisphere teleconnection Chile South America The ability of coupled climate models from the WCRP-CMIP3 multi-model dataset to reproduce the interannual seasonal variability of precipitation in South America and the influence of the Southern Annular Mode (SAM) and El Niño-Southern Oscillation (ENSO) on such variability is examined. Models are able to reproduce the northward migration of the precipitation variability maximum during autumn and winter and its later return towards the south during spring and summer as well as the high variability throughout the year in southern Chile. Nevertheless, most of them have problems in representing accurately the variability associated with the South Atlantic convergence zone during summer and the typical maximum of variability in the subtropical continent during autumn and winter. The annular-like structure characteristic of the SAM influence on the Southern Hemisphere circulation is basically simulated by all models, but they have serious deficiencies in representing the observed relationship between SAM and both precipitation and circulation anomalies in South America. In addition, most of the models are not able to reproduce the typical wavetrains observed in the circulation anomalies in the Southern Hemisphere associated to ENSO. Only few models, previously identified as those with reasonable ENSO representation at the equatorial Pacific, have evidences of such wavetrains. Coherently, they exhibit the best representation of the ENSO signal in the South American precipitation. Results show that considerable improvement in the model representation of the climate variability in South America and in the associated large-scale teleconnections is still needed. © Springer-Verlag 2009. Fil:Vera, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Silvestri, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v32_n7-8_p1003_Vera http://hdl.handle.net/20.500.12110/paper_09307575_v32_n7-8_p1003_Vera
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Coupled climate models ENSO events South American climate Southern Annular Mode WCRP-CMIP3 multi-model dataset annual variation climate modeling climate variation data set El Nino-Southern Oscillation precipitation (climatology) seasonal variation Southern Hemisphere teleconnection Chile South America
spellingShingle	Coupled climate models ENSO events South American climate Southern Annular Mode WCRP-CMIP3 multi-model dataset annual variation climate modeling climate variation data set El Nino-Southern Oscillation precipitation (climatology) seasonal variation Southern Hemisphere teleconnection Chile South America Vera, Carolina Susana Silvestri, Gabriel Emilio Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset
topic_facet	Coupled climate models ENSO events South American climate Southern Annular Mode WCRP-CMIP3 multi-model dataset annual variation climate modeling climate variation data set El Nino-Southern Oscillation precipitation (climatology) seasonal variation Southern Hemisphere teleconnection Chile South America
description	The ability of coupled climate models from the WCRP-CMIP3 multi-model dataset to reproduce the interannual seasonal variability of precipitation in South America and the influence of the Southern Annular Mode (SAM) and El Niño-Southern Oscillation (ENSO) on such variability is examined. Models are able to reproduce the northward migration of the precipitation variability maximum during autumn and winter and its later return towards the south during spring and summer as well as the high variability throughout the year in southern Chile. Nevertheless, most of them have problems in representing accurately the variability associated with the South Atlantic convergence zone during summer and the typical maximum of variability in the subtropical continent during autumn and winter. The annular-like structure characteristic of the SAM influence on the Southern Hemisphere circulation is basically simulated by all models, but they have serious deficiencies in representing the observed relationship between SAM and both precipitation and circulation anomalies in South America. In addition, most of the models are not able to reproduce the typical wavetrains observed in the circulation anomalies in the Southern Hemisphere associated to ENSO. Only few models, previously identified as those with reasonable ENSO representation at the equatorial Pacific, have evidences of such wavetrains. Coherently, they exhibit the best representation of the ENSO signal in the South American precipitation. Results show that considerable improvement in the model representation of the climate variability in South America and in the associated large-scale teleconnections is still needed. © Springer-Verlag 2009.
author	Vera, Carolina Susana Silvestri, Gabriel Emilio
author_facet	Vera, Carolina Susana Silvestri, Gabriel Emilio
author_sort	Vera, Carolina Susana
title	Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset
title_short	Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset
title_full	Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset
title_fullStr	Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset
title_full_unstemmed	Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset
title_sort	precipitation interannual variability in south america from the wcrp-cmip3 multi-model dataset
publishDate	2009
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v32_n7-8_p1003_Vera http://hdl.handle.net/20.500.12110/paper_09307575_v32_n7-8_p1003_Vera
work_keys_str_mv	AT veracarolinasusana precipitationinterannualvariabilityinsouthamericafromthewcrpcmip3multimodeldataset AT silvestrigabrielemilio precipitationinterannualvariabilityinsouthamericafromthewcrpcmip3multimodeldataset
_version_	1768542848011993088

Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset

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