Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics

Autores
Junquas, C.; Li, L.; Vera, Carolina Susana; Le Treut, H.; Takahashi, K.
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Impacts of the main South American orographic structures (the Andes, the Brazilian Plateau and the Guiana shield) on the regional climate and associated global teleconnection are investigated through numerical experiments in which some of these features are suppressed. Simulations are performed with a ‘‘two-way nesting’’ system coupling interactively the regional and global versions of the LMDZ4 atmospheric general circulation model. At regional scale, the simulations confirm previous studies, showing that both the Andes and the Brazilian Plateau exert a control on the position and strength of the South Atlantic convergence zone (SACZ), mainly through their impact on the low-level jet and the coastal branch of the subtropical anticyclones. The northern topography of South America appears to be crucial to determine the leading mode of rainfall variability in eastern South America, which manifests itself as a dipole-like pattern between Southeastern South America and the SACZ region. The suppression of South America orography also shows global-scale effects, corresponding to an adjustment of the global circulation system. Changes in atmospheric circulation and precipitation are found in remote areas on the globe, being the consequences of various teleconnection mechanisms. When the Brazilian Plateau and the Andes are suppressed, there is a decrease of precipitation in the SACZ region, associated with a weakening of the large-scale ascendance. Changes are described in terms of anomalies in the Walker circulation, meridional displacements of the mid-latitude jet stream, Southern annular mode anomalies and modifications of Rossby wave train teleconnection processes.
Fil: Junquas, C.. Instituto Geofísico del Perú ; Perú. Centre National de la Recherche Scientifique; Francia
Fil: Li, L.. Institut Pierre Simon Laplace; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Vera, Carolina Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Fil: Le Treut, H.. Institut Pierre Simon Laplace; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Takahashi, K.. Instituto Geofísico del Perú ; Perú
Materia
Global Teleconnection Processes
Orography Influence
South America Orography
Summer Precipitation
Two-Way Nesting System
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/58778
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Influence of South America orography on summertime precipitation in Southeastern South America. Climate DynamicsJunquas, C.Li, L.Vera, Carolina SusanaLe Treut, H.Takahashi, K.Global Teleconnection ProcessesOrography InfluenceSouth America OrographySummer PrecipitationTwo-Way Nesting Systemhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Impacts of the main South American orographic structures (the Andes, the Brazilian Plateau and the Guiana shield) on the regional climate and associated global teleconnection are investigated through numerical experiments in which some of these features are suppressed. Simulations are performed with a ‘‘two-way nesting’’ system coupling interactively the regional and global versions of the LMDZ4 atmospheric general circulation model. At regional scale, the simulations confirm previous studies, showing that both the Andes and the Brazilian Plateau exert a control on the position and strength of the South Atlantic convergence zone (SACZ), mainly through their impact on the low-level jet and the coastal branch of the subtropical anticyclones. The northern topography of South America appears to be crucial to determine the leading mode of rainfall variability in eastern South America, which manifests itself as a dipole-like pattern between Southeastern South America and the SACZ region. The suppression of South America orography also shows global-scale effects, corresponding to an adjustment of the global circulation system. Changes in atmospheric circulation and precipitation are found in remote areas on the globe, being the consequences of various teleconnection mechanisms. When the Brazilian Plateau and the Andes are suppressed, there is a decrease of precipitation in the SACZ region, associated with a weakening of the large-scale ascendance. Changes are described in terms of anomalies in the Walker circulation, meridional displacements of the mid-latitude jet stream, Southern annular mode anomalies and modifications of Rossby wave train teleconnection processes.Fil: Junquas, C.. Instituto Geofísico del Perú ; Perú. Centre National de la Recherche Scientifique; FranciaFil: Li, L.. Institut Pierre Simon Laplace; Francia. Centre National de la Recherche Scientifique; FranciaFil: Vera, Carolina Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Le Treut, H.. Institut Pierre Simon Laplace; Francia. Centre National de la Recherche Scientifique; FranciaFil: Takahashi, K.. Instituto Geofísico del Perú ; PerúSpringer2016-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/58778Junquas, C.; Li, L.; Vera, Carolina Susana; Le Treut, H.; Takahashi, K.; Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics; Springer; Climate Dynamics; 46; 11-12; 6-2016; 3941-39630930-7575CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-015-2814-8info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s00382-015-2814-8info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:25:31Zoai:ri.conicet.gov.ar:11336/58778instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:25:31.919CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics
title Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics
spellingShingle Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics
Junquas, C.
Global Teleconnection Processes
Orography Influence
South America Orography
Summer Precipitation
Two-Way Nesting System
title_short Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics
title_full Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics
title_fullStr Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics
title_full_unstemmed Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics
title_sort Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics
dc.creator.none.fl_str_mv Junquas, C.
Li, L.
Vera, Carolina Susana
Le Treut, H.
Takahashi, K.
author Junquas, C.
author_facet Junquas, C.
Li, L.
Vera, Carolina Susana
Le Treut, H.
Takahashi, K.
author_role author
author2 Li, L.
Vera, Carolina Susana
Le Treut, H.
Takahashi, K.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Global Teleconnection Processes
Orography Influence
South America Orography
Summer Precipitation
Two-Way Nesting System
topic Global Teleconnection Processes
Orography Influence
South America Orography
Summer Precipitation
Two-Way Nesting System
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Impacts of the main South American orographic structures (the Andes, the Brazilian Plateau and the Guiana shield) on the regional climate and associated global teleconnection are investigated through numerical experiments in which some of these features are suppressed. Simulations are performed with a ‘‘two-way nesting’’ system coupling interactively the regional and global versions of the LMDZ4 atmospheric general circulation model. At regional scale, the simulations confirm previous studies, showing that both the Andes and the Brazilian Plateau exert a control on the position and strength of the South Atlantic convergence zone (SACZ), mainly through their impact on the low-level jet and the coastal branch of the subtropical anticyclones. The northern topography of South America appears to be crucial to determine the leading mode of rainfall variability in eastern South America, which manifests itself as a dipole-like pattern between Southeastern South America and the SACZ region. The suppression of South America orography also shows global-scale effects, corresponding to an adjustment of the global circulation system. Changes in atmospheric circulation and precipitation are found in remote areas on the globe, being the consequences of various teleconnection mechanisms. When the Brazilian Plateau and the Andes are suppressed, there is a decrease of precipitation in the SACZ region, associated with a weakening of the large-scale ascendance. Changes are described in terms of anomalies in the Walker circulation, meridional displacements of the mid-latitude jet stream, Southern annular mode anomalies and modifications of Rossby wave train teleconnection processes.
Fil: Junquas, C.. Instituto Geofísico del Perú ; Perú. Centre National de la Recherche Scientifique; Francia
Fil: Li, L.. Institut Pierre Simon Laplace; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Vera, Carolina Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; Argentina
Fil: Le Treut, H.. Institut Pierre Simon Laplace; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Takahashi, K.. Instituto Geofísico del Perú ; Perú
description Impacts of the main South American orographic structures (the Andes, the Brazilian Plateau and the Guiana shield) on the regional climate and associated global teleconnection are investigated through numerical experiments in which some of these features are suppressed. Simulations are performed with a ‘‘two-way nesting’’ system coupling interactively the regional and global versions of the LMDZ4 atmospheric general circulation model. At regional scale, the simulations confirm previous studies, showing that both the Andes and the Brazilian Plateau exert a control on the position and strength of the South Atlantic convergence zone (SACZ), mainly through their impact on the low-level jet and the coastal branch of the subtropical anticyclones. The northern topography of South America appears to be crucial to determine the leading mode of rainfall variability in eastern South America, which manifests itself as a dipole-like pattern between Southeastern South America and the SACZ region. The suppression of South America orography also shows global-scale effects, corresponding to an adjustment of the global circulation system. Changes in atmospheric circulation and precipitation are found in remote areas on the globe, being the consequences of various teleconnection mechanisms. When the Brazilian Plateau and the Andes are suppressed, there is a decrease of precipitation in the SACZ region, associated with a weakening of the large-scale ascendance. Changes are described in terms of anomalies in the Walker circulation, meridional displacements of the mid-latitude jet stream, Southern annular mode anomalies and modifications of Rossby wave train teleconnection processes.
publishDate 2016
dc.date.none.fl_str_mv 2016-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/58778
Junquas, C.; Li, L.; Vera, Carolina Susana; Le Treut, H.; Takahashi, K.; Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics; Springer; Climate Dynamics; 46; 11-12; 6-2016; 3941-3963
0930-7575
CONICET Digital
CONICET
url http://hdl.handle.net/11336/58778
identifier_str_mv Junquas, C.; Li, L.; Vera, Carolina Susana; Le Treut, H.; Takahashi, K.; Influence of South America orography on summertime precipitation in Southeastern South America. Climate Dynamics; Springer; Climate Dynamics; 46; 11-12; 6-2016; 3941-3963
0930-7575
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-015-2814-8
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s00382-015-2814-8
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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