Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season

Chaco jet events (CJEs) are a subset of South American low-level jet events to the east of the Andes, characterized by enhanced poleward penetration and by a strong impact on precipitation over southeastern South America. The present study uses the Eta model short range weather forecasts produced op...

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Detalles Bibliográficos
Publicado:	2006
Materias:	climate modeling climate oscillation convection diurnal variation jet stream precipitation assessment precipitation intensity radiative forcing Andes Argentina Brazil South America Uruguay
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01777971_v94_n1-4_p129_Nicolini http://hdl.handle.net/20.500.12110/paper_01777971_v94_n1-4_p129_Nicolini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_01777971_v94_n1-4_p129_Nicolini
record_format	dspace
spelling	paper:paper_01777971_v94_n1-4_p129_Nicolini2023-06-08T15:19:09Z Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season climate modeling climate oscillation convection diurnal variation jet stream precipitation assessment precipitation intensity radiative forcing Andes Argentina Brazil South America Uruguay Chaco jet events (CJEs) are a subset of South American low-level jet events to the east of the Andes, characterized by enhanced poleward penetration and by a strong impact on precipitation over southeastern South America. The present study uses the Eta model short range weather forecasts produced operationally in the Brazilian Center for Weather Forecasts and Climate Studies (Centro de Previsão de Tempo e Estudos Climáticos, CPTEC) to characterize the CJEs and the related precipitation during the 1997-1998 warm season. An enhanced diurnal cycle in precipitation with respect to that found during the warm season mean can be recognized during CJEs in Eta/CPTEC model output, with preference for a nocturnal maximum over southern Brazil, Uruguay, and the central part of northern Argentina, and a daytime maximum near high topography (northwestern Argentina, the Brazilian Planalto). The analysis of thermodynamic and dynamic forcing appearing during CJEs, helps to explain the modeled precipitation cycle: the nocturnal maximum is mostly explained by enhanced low-level convergence at night, while the diurnal one is mainly a response to radiative warming. Boundary-layer convergence, and convective instability, present within the CJEs environment, work together to provide both dynamic forcing and potential for convection. The simulated precipitation cycle is complemented with surface observations of "current weather" that corroborate the main oscillations found in simulated precipitation. © Springer-Verlag 2006. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01777971_v94_n1-4_p129_Nicolini http://hdl.handle.net/20.500.12110/paper_01777971_v94_n1-4_p129_Nicolini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	climate modeling climate oscillation convection diurnal variation jet stream precipitation assessment precipitation intensity radiative forcing Andes Argentina Brazil South America Uruguay
spellingShingle	climate modeling climate oscillation convection diurnal variation jet stream precipitation assessment precipitation intensity radiative forcing Andes Argentina Brazil South America Uruguay Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season
topic_facet	climate modeling climate oscillation convection diurnal variation jet stream precipitation assessment precipitation intensity radiative forcing Andes Argentina Brazil South America Uruguay
description	Chaco jet events (CJEs) are a subset of South American low-level jet events to the east of the Andes, characterized by enhanced poleward penetration and by a strong impact on precipitation over southeastern South America. The present study uses the Eta model short range weather forecasts produced operationally in the Brazilian Center for Weather Forecasts and Climate Studies (Centro de Previsão de Tempo e Estudos Climáticos, CPTEC) to characterize the CJEs and the related precipitation during the 1997-1998 warm season. An enhanced diurnal cycle in precipitation with respect to that found during the warm season mean can be recognized during CJEs in Eta/CPTEC model output, with preference for a nocturnal maximum over southern Brazil, Uruguay, and the central part of northern Argentina, and a daytime maximum near high topography (northwestern Argentina, the Brazilian Planalto). The analysis of thermodynamic and dynamic forcing appearing during CJEs, helps to explain the modeled precipitation cycle: the nocturnal maximum is mostly explained by enhanced low-level convergence at night, while the diurnal one is mainly a response to radiative warming. Boundary-layer convergence, and convective instability, present within the CJEs environment, work together to provide both dynamic forcing and potential for convection. The simulated precipitation cycle is complemented with surface observations of "current weather" that corroborate the main oscillations found in simulated precipitation. © Springer-Verlag 2006.
title	Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season
title_short	Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season
title_full	Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season
title_fullStr	Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season
title_full_unstemmed	Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season
title_sort	modeled chaco low-level jets and related precipitation patterns during the 1997-1998 warm season
publishDate	2006
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01777971_v94_n1-4_p129_Nicolini http://hdl.handle.net/20.500.12110/paper_01777971_v94_n1-4_p129_Nicolini
_version_	1768541748182646784

Modeled Chaco low-level jets and related precipitation patterns during the 1997-1998 warm season

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