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, C., Silvestri, G.
Formato:	JOUR
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:	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	todo:paper_09307575_v32_n7-8_p1003_Vera
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spelling	todo:paper_09307575_v32_n7-8_p1003_Vera2023-10-03T15:47:53Z Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset Vera, C. Silvestri, G. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, C. Silvestri, G. 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.
format	JOUR
author	Vera, C. Silvestri, G.
author_facet	Vera, C. Silvestri, G.
author_sort	Vera, C.
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
url	http://hdl.handle.net/20.500.12110/paper_09307575_v32_n7-8_p1003_Vera
work_keys_str_mv	AT verac precipitationinterannualvariabilityinsouthamericafromthewcrpcmip3multimodeldataset AT silvestrig precipitationinterannualvariabilityinsouthamericafromthewcrpcmip3multimodeldataset
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Precipitation interannual variability in South America from the WCRP-CMIP3 multi-model dataset

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