Low-Level Jet seasonal climatology on Porto Alegre-RS-Brazil metropolitan region, using 1989-2003 upper-air observations
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | |
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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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 info:eu-repo/semantics/publishedVersion |
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) instname:Universidade Federal do Rio de Janeiro (UFRJ) instacron:UFRJ |
instname_str |
Universidade Federal do Rio de Janeiro (UFRJ) |
instacron_str |
UFRJ |
institution |
UFRJ |
reponame_str |
Anuário do Instituto de Geociências (Online) |
collection |
Anuário do Instituto de Geociências (Online) |
repository.name.fl_str_mv |
Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ) |
repository.mail.fl_str_mv |
anuario@igeo.ufrj.br|| |
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1797053537862025216 |