Summer convection over and around the subtropical Andes

Autores
Benedicto, Marcos; Viale, Maximiliano; Salio, Paola Veronica
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This study presents a 15-year climatology (1998–2013) of convective precipitation systems in the subtropical Andes (36° S–20° S) during the austral summer (December–February). Using the Precipitation Radar data retrieved by the Tropical Rainfall Measuring Mission satellite, we analysed the frequency, structure, and diurnal cycle of these precipitation systems. Our findings reveal that summer precipitation is predominantly convective, concentrated in large-area systems that frequently occur in the eastern subtropical Andean slopes and their adjacent plains during evening and night hours. These precipitation systems often develop deep intense convective cores (>12 km), activity of large lightning flashes, and high precipitation rates. Distinct characteristics were observed in different cross- and along-barrier regions. Over the northeastern slopes and their adjacent plains (north of 28° S), the precipitation systems usually exhibited a clear bright-band signature, indicative of a tropical convection regime, in a humid, high-instability, low-shear environment that develops large-area stratiform precipitation in the mature or decay stage. Conversely, in the southern subregion the precipitation systems over the eastern slopes and adjacent plains showed deeper radar echoes but smaller areas with less pronounced bright-band signature, suggesting a more continental nature of convection in a dry, moderate to strong wind shear environment, and with a reduced stratiform precipitation stage. Within the Andes, convective systems were quite smaller and shallower than the ones observed on the eastern side, typically developing in the midday and afternoon. The western subtropical Andean slopes experienced very scarce, shallow, and weak convection compared to the interior and eastern flank. Extratropical cyclones associated with frontal stratiform precipitation were found to even occur in summer over the western slopes south of 28° S. These findings advance our understanding of the influence of the Andes on South American rainfall and climate, highlighting the complex interplay between the atmosphere and the topography of a formidable long and high barrier.
Fil: Benedicto, Marcos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Viale, Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Salio, Paola Veronica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
Subtropical Andes
Orographic convection
summer
Climate of South America
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:11336/280462
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/280462
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Summer convection over and around the subtropical AndesBenedicto, MarcosViale, MaximilianoSalio, Paola VeronicaSubtropical AndesOrographic convectionsummerClimate of South Americahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1This study presents a 15-year climatology (1998–2013) of convective precipitation systems in the subtropical Andes (36° S–20° S) during the austral summer (December–February). Using the Precipitation Radar data retrieved by the Tropical Rainfall Measuring Mission satellite, we analysed the frequency, structure, and diurnal cycle of these precipitation systems. Our findings reveal that summer precipitation is predominantly convective, concentrated in large-area systems that frequently occur in the eastern subtropical Andean slopes and their adjacent plains during evening and night hours. These precipitation systems often develop deep intense convective cores (>12 km), activity of large lightning flashes, and high precipitation rates. Distinct characteristics were observed in different cross- and along-barrier regions. Over the northeastern slopes and their adjacent plains (north of 28° S), the precipitation systems usually exhibited a clear bright-band signature, indicative of a tropical convection regime, in a humid, high-instability, low-shear environment that develops large-area stratiform precipitation in the mature or decay stage. Conversely, in the southern subregion the precipitation systems over the eastern slopes and adjacent plains showed deeper radar echoes but smaller areas with less pronounced bright-band signature, suggesting a more continental nature of convection in a dry, moderate to strong wind shear environment, and with a reduced stratiform precipitation stage. Within the Andes, convective systems were quite smaller and shallower than the ones observed on the eastern side, typically developing in the midday and afternoon. The western subtropical Andean slopes experienced very scarce, shallow, and weak convection compared to the interior and eastern flank. Extratropical cyclones associated with frontal stratiform precipitation were found to even occur in summer over the western slopes south of 28° S. These findings advance our understanding of the influence of the Andes on South American rainfall and climate, highlighting the complex interplay between the atmosphere and the topography of a formidable long and high barrier.Fil: Benedicto, Marcos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Viale, Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Salio, Paola Veronica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaJohn Wiley & Sons Ltd2025-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/280462Benedicto, Marcos; Viale, Maximiliano; Salio, Paola Veronica; Summer convection over and around the subtropical Andes; John Wiley & Sons Ltd; Quarterly Journal of the Royal Meteorological Society; 151; 771; 7-2025; 1-210035-9009CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://rmets.onlinelibrary.wiley.com/doi/10.1002/qj.4992info:eu-repo/semantics/altIdentifier/doi/10.1002/qj.4992info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-02-26T10:04:40Zoai:ri.conicet.gov.ar:11336/280462instacron: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:34982026-02-26 10:04:40.353CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Summer convection over and around the subtropical Andes
title Summer convection over and around the subtropical Andes
spellingShingle Summer convection over and around the subtropical Andes
Benedicto, Marcos
Subtropical Andes
Orographic convection
summer
Climate of South America
title_short Summer convection over and around the subtropical Andes
title_full Summer convection over and around the subtropical Andes
title_fullStr Summer convection over and around the subtropical Andes
title_full_unstemmed Summer convection over and around the subtropical Andes
title_sort Summer convection over and around the subtropical Andes
dc.creator.none.fl_str_mv Benedicto, Marcos
Viale, Maximiliano
Salio, Paola Veronica
author Benedicto, Marcos
author_facet Benedicto, Marcos
Viale, Maximiliano
Salio, Paola Veronica
author_role author
author2 Viale, Maximiliano
Salio, Paola Veronica
author2_role author
author
dc.subject.none.fl_str_mv Subtropical Andes
Orographic convection
summer
Climate of South America
topic Subtropical Andes
Orographic convection
summer
Climate of South America
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv This study presents a 15-year climatology (1998–2013) of convective precipitation systems in the subtropical Andes (36° S–20° S) during the austral summer (December–February). Using the Precipitation Radar data retrieved by the Tropical Rainfall Measuring Mission satellite, we analysed the frequency, structure, and diurnal cycle of these precipitation systems. Our findings reveal that summer precipitation is predominantly convective, concentrated in large-area systems that frequently occur in the eastern subtropical Andean slopes and their adjacent plains during evening and night hours. These precipitation systems often develop deep intense convective cores (>12 km), activity of large lightning flashes, and high precipitation rates. Distinct characteristics were observed in different cross- and along-barrier regions. Over the northeastern slopes and their adjacent plains (north of 28° S), the precipitation systems usually exhibited a clear bright-band signature, indicative of a tropical convection regime, in a humid, high-instability, low-shear environment that develops large-area stratiform precipitation in the mature or decay stage. Conversely, in the southern subregion the precipitation systems over the eastern slopes and adjacent plains showed deeper radar echoes but smaller areas with less pronounced bright-band signature, suggesting a more continental nature of convection in a dry, moderate to strong wind shear environment, and with a reduced stratiform precipitation stage. Within the Andes, convective systems were quite smaller and shallower than the ones observed on the eastern side, typically developing in the midday and afternoon. The western subtropical Andean slopes experienced very scarce, shallow, and weak convection compared to the interior and eastern flank. Extratropical cyclones associated with frontal stratiform precipitation were found to even occur in summer over the western slopes south of 28° S. These findings advance our understanding of the influence of the Andes on South American rainfall and climate, highlighting the complex interplay between the atmosphere and the topography of a formidable long and high barrier.
Fil: Benedicto, Marcos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Viale, Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Salio, Paola Veronica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias de la Atmósfera y los Océanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description This study presents a 15-year climatology (1998–2013) of convective precipitation systems in the subtropical Andes (36° S–20° S) during the austral summer (December–February). Using the Precipitation Radar data retrieved by the Tropical Rainfall Measuring Mission satellite, we analysed the frequency, structure, and diurnal cycle of these precipitation systems. Our findings reveal that summer precipitation is predominantly convective, concentrated in large-area systems that frequently occur in the eastern subtropical Andean slopes and their adjacent plains during evening and night hours. These precipitation systems often develop deep intense convective cores (>12 km), activity of large lightning flashes, and high precipitation rates. Distinct characteristics were observed in different cross- and along-barrier regions. Over the northeastern slopes and their adjacent plains (north of 28° S), the precipitation systems usually exhibited a clear bright-band signature, indicative of a tropical convection regime, in a humid, high-instability, low-shear environment that develops large-area stratiform precipitation in the mature or decay stage. Conversely, in the southern subregion the precipitation systems over the eastern slopes and adjacent plains showed deeper radar echoes but smaller areas with less pronounced bright-band signature, suggesting a more continental nature of convection in a dry, moderate to strong wind shear environment, and with a reduced stratiform precipitation stage. Within the Andes, convective systems were quite smaller and shallower than the ones observed on the eastern side, typically developing in the midday and afternoon. The western subtropical Andean slopes experienced very scarce, shallow, and weak convection compared to the interior and eastern flank. Extratropical cyclones associated with frontal stratiform precipitation were found to even occur in summer over the western slopes south of 28° S. These findings advance our understanding of the influence of the Andes on South American rainfall and climate, highlighting the complex interplay between the atmosphere and the topography of a formidable long and high barrier.
publishDate 2025
dc.date.none.fl_str_mv 2025-07
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/11336/280462
Benedicto, Marcos; Viale, Maximiliano; Salio, Paola Veronica; Summer convection over and around the subtropical Andes; John Wiley & Sons Ltd; Quarterly Journal of the Royal Meteorological Society; 151; 771; 7-2025; 1-21
0035-9009
CONICET Digital
CONICET
url http://hdl.handle.net/11336/280462
identifier_str_mv Benedicto, Marcos; Viale, Maximiliano; Salio, Paola Veronica; Summer convection over and around the subtropical Andes; John Wiley & Sons Ltd; Quarterly Journal of the Royal Meteorological Society; 151; 771; 7-2025; 1-21
0035-9009
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://rmets.onlinelibrary.wiley.com/doi/10.1002/qj.4992
info:eu-repo/semantics/altIdentifier/doi/10.1002/qj.4992
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 John Wiley & Sons Ltd
publisher.none.fl_str_mv John Wiley & Sons Ltd
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 13.176822

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