Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Anuário do Instituto de Geociências (Online) |
Texto Completo: | https://revistas.ufrj.br/index.php/aigeo/article/view/52599 |
Resumo: | Downslope windstorm known as Vento Norte (VNOR; Portuguese for “North Wind”) is a common phenomenon that occurs in southern Brazil during the winter season. Hence, this study attempted to investigate the climatological characteristics of VNOR using seventeen years (2004–2020) of hourly observations collected at seven meteorological stations distributed over the central region of Rio Grande do Sul State. The VNOR windstorm episodes are identified by intense wind gusts and warm air advection from the northern direction. They were selected from the data set obtained during the winter in the city of Santa Maria (SM). Statistical analysis showed that the detected VNOR events were characterized by mean wind gusts ≈15 m.s-1, mean wind direction of 350° and mean air temperature of 27 °C. Average duration of the events was about 9 h, with the longest event lasting 21 h. Characteristics and effects of this phenomenon were compared with those in other locations (meridional and zonal sections). Average values of wind gusts from the northern direction presented a significant increase of ≈200% for the winter period in SM. Nonetheless, a less significant increase in wind gusts was recorded in the meridional (28%) and zonal (41%) sections away from SM. The central location of SM has favorable topographic characteristics for this amplification, with a sharp altitude difference caused by the plateau- plain interface of ≈300 m. Our findings showed that the VNOR phenomenon mainly affects the climate of the southern region of Brazil, with a local amplification in the city of SM. |
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Climatological Features of the Vento Norte Phenomenon in the Extreme South of BrazilDownslope WindsRegional AdvectionLocal TopographyDownslope windstorm known as Vento Norte (VNOR; Portuguese for “North Wind”) is a common phenomenon that occurs in southern Brazil during the winter season. Hence, this study attempted to investigate the climatological characteristics of VNOR using seventeen years (2004–2020) of hourly observations collected at seven meteorological stations distributed over the central region of Rio Grande do Sul State. The VNOR windstorm episodes are identified by intense wind gusts and warm air advection from the northern direction. They were selected from the data set obtained during the winter in the city of Santa Maria (SM). Statistical analysis showed that the detected VNOR events were characterized by mean wind gusts ≈15 m.s-1, mean wind direction of 350° and mean air temperature of 27 °C. Average duration of the events was about 9 h, with the longest event lasting 21 h. Characteristics and effects of this phenomenon were compared with those in other locations (meridional and zonal sections). Average values of wind gusts from the northern direction presented a significant increase of ≈200% for the winter period in SM. Nonetheless, a less significant increase in wind gusts was recorded in the meridional (28%) and zonal (41%) sections away from SM. The central location of SM has favorable topographic characteristics for this amplification, with a sharp altitude difference caused by the plateau- plain interface of ≈300 m. Our findings showed that the VNOR phenomenon mainly affects the climate of the southern region of Brazil, with a local amplification in the city of SM.Universidade Federal do Rio de Janeiro2023-04-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/5259910.11137/1982-3908_2023_46_52599Anuário do Instituto de Geociências; v. 46 (2023)Anuário do Instituto de Geociências; Vol. 46 (2023)1982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJenghttps://revistas.ufrj.br/index.php/aigeo/article/view/52599/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/52599/39002https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39003https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39004https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39051https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39052Copyright (c) 2023 Anuário do Instituto de Geociênciasinfo:eu-repo/semantics/openAccessda Rosa, Cinara EwerlingStefanello, MichelFacco, Douglas StefanelloRoberti, Débora ReginaRossi, Fábio DinizDegrazia, Gervásio Annes2023-04-24T13:55:12Zoai:ojs.pkp.sfu.ca:article/52599Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2023-04-24T13:55:12Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false |
dc.title.none.fl_str_mv |
Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil |
title |
Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil |
spellingShingle |
Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil da Rosa, Cinara Ewerling Downslope Winds Regional Advection Local Topography |
title_short |
Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil |
title_full |
Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil |
title_fullStr |
Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil |
title_full_unstemmed |
Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil |
title_sort |
Climatological Features of the Vento Norte Phenomenon in the Extreme South of Brazil |
author |
da Rosa, Cinara Ewerling |
author_facet |
da Rosa, Cinara Ewerling Stefanello, Michel Facco, Douglas Stefanello Roberti, Débora Regina Rossi, Fábio Diniz Degrazia, Gervásio Annes |
author_role |
author |
author2 |
Stefanello, Michel Facco, Douglas Stefanello Roberti, Débora Regina Rossi, Fábio Diniz Degrazia, Gervásio Annes |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
da Rosa, Cinara Ewerling Stefanello, Michel Facco, Douglas Stefanello Roberti, Débora Regina Rossi, Fábio Diniz Degrazia, Gervásio Annes |
dc.subject.por.fl_str_mv |
Downslope Winds Regional Advection Local Topography |
topic |
Downslope Winds Regional Advection Local Topography |
description |
Downslope windstorm known as Vento Norte (VNOR; Portuguese for “North Wind”) is a common phenomenon that occurs in southern Brazil during the winter season. Hence, this study attempted to investigate the climatological characteristics of VNOR using seventeen years (2004–2020) of hourly observations collected at seven meteorological stations distributed over the central region of Rio Grande do Sul State. The VNOR windstorm episodes are identified by intense wind gusts and warm air advection from the northern direction. They were selected from the data set obtained during the winter in the city of Santa Maria (SM). Statistical analysis showed that the detected VNOR events were characterized by mean wind gusts ≈15 m.s-1, mean wind direction of 350° and mean air temperature of 27 °C. Average duration of the events was about 9 h, with the longest event lasting 21 h. Characteristics and effects of this phenomenon were compared with those in other locations (meridional and zonal sections). Average values of wind gusts from the northern direction presented a significant increase of ≈200% for the winter period in SM. Nonetheless, a less significant increase in wind gusts was recorded in the meridional (28%) and zonal (41%) sections away from SM. The central location of SM has favorable topographic characteristics for this amplification, with a sharp altitude difference caused by the plateau- plain interface of ≈300 m. Our findings showed that the VNOR phenomenon mainly affects the climate of the southern region of Brazil, with a local amplification in the city of SM. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-04-12 |
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/52599 10.11137/1982-3908_2023_46_52599 |
url |
https://revistas.ufrj.br/index.php/aigeo/article/view/52599 |
identifier_str_mv |
10.11137/1982-3908_2023_46_52599 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/52599/pdf https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39002 https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39003 https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39004 https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39051 https://revistas.ufrj.br/index.php/aigeo/article/view/52599/39052 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2023 Anuário do Instituto de Geociências info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2023 Anuário do Instituto de Geociências |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf application/pdf application/pdf 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; v. 46 (2023) Anuário do Instituto de Geociências; Vol. 46 (2023) 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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1797053535705104384 |