Model characterization of the South American low-level flow during the 1997-1998 spring-summer season

A relevant feature of the South American low-level circulation during the wet season is a poleward warm and moist current immediately to the east of the Andes often referred to as a low-level jet, because of its resemblance to the Great Plains low-level jet. Provided that the lack of observational d...

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Autores principales: Saulo, A.C., Nicolini, M., Chou, S.C.
Formato: JOUR
Materias:
atmospheric circulation
jet flow
model analysis
low flow
model validation
troposphere
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09307575_v16_n10-11_p867_Saulo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09307575_v16_n10-11_p867_Saulo
record_format dspace
spelling todo:paper_09307575_v16_n10-11_p867_Saulo2023-10-03T15:47:48Z Model characterization of the South American low-level flow during the 1997-1998 spring-summer season Saulo, A.C. Nicolini, M. Chou, S.C. atmospheric circulation jet flow model analysis atmospheric circulation jet flow low flow model validation troposphere South America A relevant feature of the South American low-level circulation during the wet season is a poleward warm and moist current immediately to the east of the Andes often referred to as a low-level jet, because of its resemblance to the Great Plains low-level jet. Provided that the lack of observational data causes a great deal of uncertainty on the ability of analyses to describe diurnal fluctuations of sub-synoptic features like a low-level jet, this description has been carried out using the Eta regional model. Special emphasis has been given to the detection and characterization of a low-level jet (LLJ) east of the Andes, as a feature best developed at night and mesoscale cross-stream dimensions. This study describes the modeled northerly current east of the Andes during the 1997-1998 warm season, and progress on its mean characterization, including diurnal fluctuations and horizontal and vertical structure. From moisture budget calculations a net convergence of moisture flux is found over an area that includes the Del Plata basin, with a maximum southward flux through the northern boundary at low levels. While there are evidences to suggest that this model provides a realistic description of the local circulation, it is emphasized that observational data are needed to gain further understanding of the behavior of the South American low-level jet and its role upon the regional climate. © Springer-Verlag 2000. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09307575_v16_n10-11_p867_Saulo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic atmospheric circulation
jet flow
model analysis
atmospheric circulation
jet flow
low flow
model validation
troposphere
South America
spellingShingle atmospheric circulation
jet flow
model analysis
atmospheric circulation
jet flow
low flow
model validation
troposphere
South America
Saulo, A.C.
Nicolini, M.
Chou, S.C.
Model characterization of the South American low-level flow during the 1997-1998 spring-summer season
topic_facet atmospheric circulation
jet flow
model analysis
atmospheric circulation
jet flow
low flow
model validation
troposphere
South America
description A relevant feature of the South American low-level circulation during the wet season is a poleward warm and moist current immediately to the east of the Andes often referred to as a low-level jet, because of its resemblance to the Great Plains low-level jet. Provided that the lack of observational data causes a great deal of uncertainty on the ability of analyses to describe diurnal fluctuations of sub-synoptic features like a low-level jet, this description has been carried out using the Eta regional model. Special emphasis has been given to the detection and characterization of a low-level jet (LLJ) east of the Andes, as a feature best developed at night and mesoscale cross-stream dimensions. This study describes the modeled northerly current east of the Andes during the 1997-1998 warm season, and progress on its mean characterization, including diurnal fluctuations and horizontal and vertical structure. From moisture budget calculations a net convergence of moisture flux is found over an area that includes the Del Plata basin, with a maximum southward flux through the northern boundary at low levels. While there are evidences to suggest that this model provides a realistic description of the local circulation, it is emphasized that observational data are needed to gain further understanding of the behavior of the South American low-level jet and its role upon the regional climate. © Springer-Verlag 2000.
format JOUR
author Saulo, A.C.
Nicolini, M.
Chou, S.C.
author_facet Saulo, A.C.
Nicolini, M.
Chou, S.C.
author_sort Saulo, A.C.
title Model characterization of the South American low-level flow during the 1997-1998 spring-summer season
title_short Model characterization of the South American low-level flow during the 1997-1998 spring-summer season
title_full Model characterization of the South American low-level flow during the 1997-1998 spring-summer season
title_fullStr Model characterization of the South American low-level flow during the 1997-1998 spring-summer season
title_full_unstemmed Model characterization of the South American low-level flow during the 1997-1998 spring-summer season
title_sort model characterization of the south american low-level flow during the 1997-1998 spring-summer season
url http://hdl.handle.net/20.500.12110/paper_09307575_v16_n10-11_p867_Saulo
work_keys_str_mv AT sauloac modelcharacterizationofthesouthamericanlowlevelflowduringthe19971998springsummerseason
AT nicolinim modelcharacterizationofthesouthamericanlowlevelflowduringthe19971998springsummerseason
AT chousc modelcharacterizationofthesouthamericanlowlevelflowduringthe19971998springsummerseason
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