Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations

Detalhes bibliográficos
Autor(a) principal: Campos, Cláudia Rejane Jacondino de
Data de Publicação: 2007
Outros Autores: Santos, José Guilherme Martins dos
Tipo de documento: Artigo
Idioma: por
Título da fonte: Anuário do Instituto de Geociências (Online)
Texto Completo: https://revistas.ufrj.br/index.php/aigeo/article/view/6770
Resumo: The aim of this work was to develop a climatology observational study of the Low-Level Jet (LLJ), observed at Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 at 00:00 and 12:00 UTC upper-air observations, from Porto Alegre International Airpot station. The LLJ classification criteria proposed by Bonner (1968) and modified by Whiteman et al. (1997) were applied to determine the LLJ occurrence. Afterwards the LLJ selected were separated by season (autumn, winter, spring and summer) and then were classified according to: i) LLJ intensity, ii) more frequent height of LLJ occurrence and iii) LLJ predominant direction. The results showed that the LLJ have been more frequent in spring (12:00 UTC) and in summer (00:00 UTC). Mostly of them presented velocity between 10 and 16 m s-1, and seems to occur in distinct heights depending on the time (at 00:00UTC in 600 m and at 12:00 UTC in 900 m). The LLJ predominant direction showed that at 00:00 UTC, the LLJ were more frequent in the east quadrant, while at 12:00 UTC, this predominance was verified in the west and north quadrants.
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spelling Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observationsClimatologia sazonal dos Jatos de Baixos Níveis na região metropolitana de Porto Alegre, no período de 1989 a 2003, utilizando dados de radiossondagensThe aim of this work was to develop a climatology observational study of the Low-Level Jet (LLJ), observed at Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 at 00:00 and 12:00 UTC upper-air observations, from Porto Alegre International Airpot station. The LLJ classification criteria proposed by Bonner (1968) and modified by Whiteman et al. (1997) were applied to determine the LLJ occurrence. Afterwards the LLJ selected were separated by season (autumn, winter, spring and summer) and then were classified according to: i) LLJ intensity, ii) more frequent height of LLJ occurrence and iii) LLJ predominant direction. The results showed that the LLJ have been more frequent in spring (12:00 UTC) and in summer (00:00 UTC). Mostly of them presented velocity between 10 and 16 m s-1, and seems to occur in distinct heights depending on the time (at 00:00UTC in 600 m and at 12:00 UTC in 900 m). The LLJ predominant direction showed that at 00:00 UTC, the LLJ were more frequent in the east quadrant, while at 12:00 UTC, this predominance was verified in the west and north quadrants.Este trabalho teve por objetivo realizar um estudo climatológico observacional dos Jatos de Baixos Níveis (JBN) que ocorreram no período de 1989 a 2003, na região metropolitana de Porto Alegre-RS, usando dados de radiossondagens dos horários de 00:00 e 12:00 UTC, obtidos na estação do Aeroporto Internacional de Porto Alegre. A ocorrência dos JBN foi determinada utilizando os critérios propostos por Bonner (1968) e modificados por Whiteman et al. (1997). Em seguida, os JBN foram separados por estação do ano (outono, inverno, primavera e verão) e foram classificados de acordo com: i) intensidade do JBN, ii) altura em que os JBN ocorreram com mais freqüência e iii) direção predominante dos JBN. Os resultados mostraram que os JBN foram mais freqüentes na primavera (12:00 UTC) e verão (00:00 UTC). A maior parte deles apresentou velocidades entre 10 e 16 m s-1, e a maior ocorrência se deu em alturas distintas dependendo do horário (às 00:00 UTC em 600 m e às 12:00 UTC em 900 m). A direção predominante dos JBN mostrou que às 00:00 UTC, os JBN foram mais freqüentes no quadrante leste, enquanto que às 12:00 UTC, esta predominância foi verificada nos quadrantes oeste e norte.Universidade Federal do Rio de Janeiro2007-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/677010.11137/2007_2_82-91Anuário do Instituto de Geociências; Vol 30, No 2 (2007); 82-91Anuário do Instituto de Geociências; Vol 30, No 2 (2007); 82-911982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJporhttps://revistas.ufrj.br/index.php/aigeo/article/view/6770/5367Copyright (c) 2007 Anuário do Instituto de Geociênciashttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessCampos, Cláudia Rejane Jacondino deSantos, José Guilherme Martins dos2017-01-23T21:48:24Zoai:www.revistas.ufrj.br:article/6770Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2017-01-23T21:48:24Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
Climatologia sazonal dos Jatos de Baixos Níveis na região metropolitana de Porto Alegre, no período de 1989 a 2003, utilizando dados de radiossondagens
title Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
spellingShingle Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
Campos, Cláudia Rejane Jacondino de
title_short Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
title_full Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
title_fullStr Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
title_full_unstemmed Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
title_sort Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
author Campos, Cláudia Rejane Jacondino de
author_facet Campos, Cláudia Rejane Jacondino de
Santos, José Guilherme Martins dos
author_role author
author2 Santos, José Guilherme Martins dos
author2_role author
dc.contributor.author.fl_str_mv Campos, Cláudia Rejane Jacondino de
Santos, José Guilherme Martins dos
description The aim of this work was to develop a climatology observational study of the Low-Level Jet (LLJ), observed at Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 at 00:00 and 12:00 UTC upper-air observations, from Porto Alegre International Airpot station. The LLJ classification criteria proposed by Bonner (1968) and modified by Whiteman et al. (1997) were applied to determine the LLJ occurrence. Afterwards the LLJ selected were separated by season (autumn, winter, spring and summer) and then were classified according to: i) LLJ intensity, ii) more frequent height of LLJ occurrence and iii) LLJ predominant direction. The results showed that the LLJ have been more frequent in spring (12:00 UTC) and in summer (00:00 UTC). Mostly of them presented velocity between 10 and 16 m s-1, and seems to occur in distinct heights depending on the time (at 00:00UTC in 600 m and at 12:00 UTC in 900 m). The LLJ predominant direction showed that at 00:00 UTC, the LLJ were more frequent in the east quadrant, while at 12:00 UTC, this predominance was verified in the west and north quadrants.
publishDate 2007
dc.date.none.fl_str_mv 2007-12-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://revistas.ufrj.br/index.php/aigeo/article/view/6770
10.11137/2007_2_82-91
url https://revistas.ufrj.br/index.php/aigeo/article/view/6770
identifier_str_mv 10.11137/2007_2_82-91
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://revistas.ufrj.br/index.php/aigeo/article/view/6770/5367
dc.rights.driver.fl_str_mv Copyright (c) 2007 Anuário do Instituto de Geociências
http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2007 Anuário do Instituto de Geociências
http://creativecommons.org/licenses/by/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
dc.source.none.fl_str_mv Anuário do Instituto de Geociências; Vol 30, No 2 (2007); 82-91
Anuário do Instituto de Geociências; Vol 30, No 2 (2007); 82-91
1982-3908
0101-9759
reponame:Anuário do Instituto de Geociências (Online)
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reponame_str Anuário do Instituto de Geociências (Online)
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