Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales

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Descargue el texto completo en el repositorio institucional de la Universidade de São Paulo: https://doi.org/10.11606/T.14.2019.tde-06082019-134442
Detalles Bibliográficos
Autor: Chávez Mayta, Víctor Raúl
Formato: tesis doctoral
Fecha de Publicación:2019
Institución:Superintendencia Nacional de Educación Superior Universitaria
Repositorio:Registro Nacional de Trabajos conducentes a Grados y Títulos - RENATI
Lenguaje:inglés
OAI Identifier:oai:renati.sunedu.gob.pe:renati/3877
Enlace del recurso:https://renati.sunedu.gob.pe/handle/sunedu/3233977
https://doi.org/10.11606/T.14.2019.tde-06082019-134442
Nivel de acceso:acceso abierto
Materia:Cuencas hidrográficas
Cuenca amazónica
Perturbaciones climáticas
Variabilidad intraestacional
https://purl.org/pe-repo/ocde/ford#1.05.09
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dc.title.es_PE.fl_str_mv Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
dc.title.alternative.es_PE.fl_str_mv Impacto de las ondas tropicales y extratropicales en la precipitación de la cuenca del Amazonas: escalas de tiempo subestacional e intraestacional
title Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
spellingShingle Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
Chávez Mayta, Víctor Raúl
Cuencas hidrográficas
Cuenca amazónica
Perturbaciones climáticas
Variabilidad intraestacional
https://purl.org/pe-repo/ocde/ford#1.05.09
title_short Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
title_full Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
title_fullStr Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
title_full_unstemmed Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
title_sort Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
author Chávez Mayta, Víctor Raúl
author_facet Chávez Mayta, Víctor Raúl
author_role author
dc.contributor.advisor.fl_str_mv Ambrizzi, Tercio
Silva Dias, Pedro L.
dc.contributor.author.fl_str_mv Chávez Mayta, Víctor Raúl
dc.subject.es_PE.fl_str_mv Cuencas hidrográficas
Cuenca amazónica
Perturbaciones climáticas
Variabilidad intraestacional
topic Cuencas hidrográficas
Cuenca amazónica
Perturbaciones climáticas
Variabilidad intraestacional
https://purl.org/pe-repo/ocde/ford#1.05.09
dc.subject.ocde.es_PE.fl_str_mv https://purl.org/pe-repo/ocde/ford#1.05.09
description Descargue el texto completo en el repositorio institucional de la Universidade de São Paulo: https://doi.org/10.11606/T.14.2019.tde-06082019-134442
publishDate 2019
dc.date.accessioned.none.fl_str_mv 2022-08-31T21:28:59Z
dc.date.available.none.fl_str_mv 2022-08-31T21:28:59Z
dc.date.issued.fl_str_mv 2019
dc.type.es_PE.fl_str_mv info:eu-repo/semantics/doctoralThesis
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url https://renati.sunedu.gob.pe/handle/sunedu/3233977
https://doi.org/10.11606/T.14.2019.tde-06082019-134442
dc.language.iso.es_PE.fl_str_mv eng
language eng
dc.rights.es_PE.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.es_PE.fl_str_mv application/pdf
dc.publisher.es_PE.fl_str_mv Universidade de São Paulo
dc.publisher.country.es_PE.fl_str_mv BR
dc.source.es_PE.fl_str_mv Superintendencia Nacional de Educación Superior Universitaria - SUNEDU
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spelling Ambrizzi, TercioSilva Dias, Pedro L.Chávez Mayta, Víctor Raúl2022-08-31T21:28:59Z2022-08-31T21:28:59Z2019https://renati.sunedu.gob.pe/handle/sunedu/3233977https://doi.org/10.11606/T.14.2019.tde-06082019-134442Descargue el texto completo en el repositorio institucional de la Universidade de São Paulo: https://doi.org/10.11606/T.14.2019.tde-06082019-134442Esta investigación presenta observaciones que asocian perturbaciones de ondas tropicales y extratropicales en la organización de la precipitación sobre la Cuenca Amazónica (BA). Los resultados sugieren que en la variabilidad de baja frecuencia intraestacional (banda de 30 a 70 días), la Oscilación de Madden-Julian es uno de los principales mecanismos atmosféricos que modulan la variabilidad de la precipitación sobre la región amazónica, jugando un papel fundamental, principalmente durante el invierno austral. A escalas de mayor frecuencia, las ondas de Kelvin acopladas convectivamente juegan un papel relevante en la organización de la convección sobre la Amazonía. Se encuentran dos tipos principales de ondas Kelvin sobre el Amazonas: ondas Kelvin con un precursor del Pacífico que se propaga hacia el Amazonas y ondas Kelvin con un precursor de América del Sur. Ondas de Kelvin con precusor en el Pacífico oriental representa aproximadamente el 35% del total de eventos. Los casos con precursor en América del Sur están asociados con la actividad de los trenes de olas extratropicales, responsables del 40% del total de eventos, o convección “in situ“ que excita localmente las ondas Kelvin, que representan el 25% restante.Observational evidences linking tropical and extratropical wave disturbances in organizing precipitation over the Amazon basin (AB) are presented. The time scale of the wave disturbances considered in this thesis are from intraseasonal (low- and high-frequency intraseasonal) to subseasonal. The results are based on observed, satellite, and reanalysis datasets. The results suggest that on 30-70-day low-frequency, the Madden-Julian oscillation (MJO) is one of the main atmospheric mechanisms modulating intraseasonal rainfall variability over the Amazon region, playing an important role, particularly during the austral winter. Despite of the fact that the AB region extends over tropical region, the 30-70-day low-frequency intraseasonal are not strictly associated to the forcing produced by the equatorially propagating MJO. In addition, it is suggested that convective-based MJO indices are able to better account the influence of the MJO on intraseasonal precipitation. The 10-30-day high-frequency intraseasonal (HFIS) activity account for about 22% of the total Amazon low-frequency intraseasonal rainfall events and it is part of large-scale pattern observed over South America during the onset of austral rainfall season (October-November) and during the dry season (May-September). It seems that during the peak of the wet season (December-April), the Northwest-Southeast orientation of the precipitation seems to be influenced by Rossby wave trains not previously documented, with a southeastern South America (SESA)-South America convergence zone (SACZ) pattern. At higher time-scales, the Convectively Coupled Kelvin waves (CCKW) has a relevant role in organizing convection over the Amazon. They are more active during the transition seasons (austral spring and autumn), with peaks in November and March. The vertical structure observed on both radiosonde and reanalysis data have confirmed the existence of a second baroclinic mode as widely documented in previous works. CCKW propagate slightly faster over central and eastern Pacific (24.0 m s-1), slow down over the Amazon (13.5 m s-1) and then continues their propagation over the tropical Atlantic at about 20.8 m s-1. Two main types of Kelvin waves over the Amazon are found: Kelvin waves with a Pacific precursor that propagates into the Amazon, and Kelvin waves with a South America precursor. CCKW associated with a preexisting Kelvin in the eastern Pacific account for about 35% of the total events. The cases with South America precursor are associated with either pressure surges from extratropical wave trains activity, responsible for 40% of the total events, or “in situ“ convection that locally excite Kelvin waves, accounting for the remaining 25%.Brasil. Ministério da Educação. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes)application/pdfengUniversidade de São PauloBRinfo:eu-repo/semantics/openAccessSuperintendencia Nacional de Educación Superior Universitaria - SUNEDURegistro Nacional de Trabajos de Investigación - RENATIreponame:Registro Nacional de Trabajos conducentes a Grados y Títulos - RENATIinstname:Superintendencia Nacional de Educación Superior Universitariainstacron:SUNEDUCuencas hidrográficasCuenca amazónicaPerturbaciones climáticasVariabilidad intraestacionalhttps://purl.org/pe-repo/ocde/ford#1.05.09Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal TimescalesImpacto de las ondas tropicales y extratropicales en la precipitación de la cuenca del Amazonas: escalas de tiempo subestacional e intraestacionalinfo:eu-repo/semantics/doctoralThesisUniversidade de São Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas. 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Tropical and Extratropical Wave Disturbances Impact on the Amazon Basin Precipitation: Subseasonal to Intraseasonal Timescales
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