Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.3354/cr01358 http://hdl.handle.net/11449/176920 |
Resumo: | This work investigates how regional climate models REMO and RegCM4 simulate the frequency of cold fronts (CFs) over southern Brazil and the contribution of these systems to the seasonal precipitation over the southern part of La Plata Basin (SLPB) in South America. Simulations were driven by the ERA-Interim reanalysis and compared with local observations (from Rio Grande station; RG), ERA-Interim, and rainfall analysis from the Climate Prediction Center (CPC). CF identification was carried out objectively by considering (1) the turning of the meridional wind component from north to south and (2) a decrease in air temperature between 1 d before and 1 d after the CF passage. For the period 1991-2008, a mean of 55.3, 53.1 and 51.8 CFs yr-1 were identified, respectively, for RG (observed), REMO and RegCM4. These values show a small bias in the simulated annual frequency of CFs (around -5%), but the underestimation reaches -17% during summer in the RegCM4. In the simulations, it is possible to find some association between seasonal bias of rainfall and the bias of rainfall during CF periods (defined as extending from 2 d before to 2 d after the CF passage) over SLPB. Except in summer, RegCM4 presents stronger biases than REMO for rainfall for both CF periods and overall seasonal climatology. For the winter season, the CF composites indicate that deeper low pressure and larger availability of moisture at low levels (from 2 d before to the day of the CF) contribute to the small underestimation of rainfall in REMO (-5%) compared with RegCM4 (-25%). |
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Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata BasinCold frontsLa Plata BasinPrecipitationRegional climate modelsThis work investigates how regional climate models REMO and RegCM4 simulate the frequency of cold fronts (CFs) over southern Brazil and the contribution of these systems to the seasonal precipitation over the southern part of La Plata Basin (SLPB) in South America. Simulations were driven by the ERA-Interim reanalysis and compared with local observations (from Rio Grande station; RG), ERA-Interim, and rainfall analysis from the Climate Prediction Center (CPC). CF identification was carried out objectively by considering (1) the turning of the meridional wind component from north to south and (2) a decrease in air temperature between 1 d before and 1 d after the CF passage. For the period 1991-2008, a mean of 55.3, 53.1 and 51.8 CFs yr-1 were identified, respectively, for RG (observed), REMO and RegCM4. These values show a small bias in the simulated annual frequency of CFs (around -5%), but the underestimation reaches -17% during summer in the RegCM4. In the simulations, it is possible to find some association between seasonal bias of rainfall and the bias of rainfall during CF periods (defined as extending from 2 d before to 2 d after the CF passage) over SLPB. Except in summer, RegCM4 presents stronger biases than REMO for rainfall for both CF periods and overall seasonal climatology. For the winter season, the CF composites indicate that deeper low pressure and larger availability of moisture at low levels (from 2 d before to the day of the CF) contribute to the small underestimation of rainfall in REMO (-5%) compared with RegCM4 (-25%).Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Department of Atmospheric Sciences University of S�o Paulo 1226 Cidade Universit�ria, Rua do Mat�oNatural Resources Institute Federal University of Itajub�, Av. BPS 1303Departamento de F�sica Universidade Estadual Paulista (UNESP)Centro de Meteorologia de Bauru (IPMet)Climate Service Center Germany (GERICS) Chilehaus Eingang B, Fischertwiete 1Departamento de F�sica Universidade Estadual Paulista (UNESP)1226 Cidade Universit�riaFederal University of Itajub�Universidade Estadual Paulista (Unesp)Centro de Meteorologia de Bauru (IPMet)Eingang BDe Jesus, Eduardo MarcosDa Rocha, Rosmeri Porf�rioReboita, Michelle Sim�esLlopart, Marta [UNESP]Dutra, L�via M�rcia MossoRemedio, Armelle Reca C.2018-12-11T17:23:06Z2018-12-11T17:23:06Z2016-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article243-255http://dx.doi.org/10.3354/cr01358Climate Research, v. 68, n. 2-3, p. 243-255, 2016.1616-15720936-577Xhttp://hdl.handle.net/11449/17692010.3354/cr013582-s2.0-84966658424Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengClimate Research0,774info:eu-repo/semantics/openAccess2021-10-23T16:00:41Zoai:repositorio.unesp.br:11449/176920Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:13:49.719386Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin |
title |
Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin |
spellingShingle |
Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin De Jesus, Eduardo Marcos Cold fronts La Plata Basin Precipitation Regional climate models |
title_short |
Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin |
title_full |
Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin |
title_fullStr |
Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin |
title_full_unstemmed |
Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin |
title_sort |
Contribution of cold fronts to seasonal rainfall in simulations over the southern la Plata Basin |
author |
De Jesus, Eduardo Marcos |
author_facet |
De Jesus, Eduardo Marcos Da Rocha, Rosmeri Porf�rio Reboita, Michelle Sim�es Llopart, Marta [UNESP] Dutra, L�via M�rcia Mosso Remedio, Armelle Reca C. |
author_role |
author |
author2 |
Da Rocha, Rosmeri Porf�rio Reboita, Michelle Sim�es Llopart, Marta [UNESP] Dutra, L�via M�rcia Mosso Remedio, Armelle Reca C. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
1226 Cidade Universit�ria Federal University of Itajub� Universidade Estadual Paulista (Unesp) Centro de Meteorologia de Bauru (IPMet) Eingang B |
dc.contributor.author.fl_str_mv |
De Jesus, Eduardo Marcos Da Rocha, Rosmeri Porf�rio Reboita, Michelle Sim�es Llopart, Marta [UNESP] Dutra, L�via M�rcia Mosso Remedio, Armelle Reca C. |
dc.subject.por.fl_str_mv |
Cold fronts La Plata Basin Precipitation Regional climate models |
topic |
Cold fronts La Plata Basin Precipitation Regional climate models |
description |
This work investigates how regional climate models REMO and RegCM4 simulate the frequency of cold fronts (CFs) over southern Brazil and the contribution of these systems to the seasonal precipitation over the southern part of La Plata Basin (SLPB) in South America. Simulations were driven by the ERA-Interim reanalysis and compared with local observations (from Rio Grande station; RG), ERA-Interim, and rainfall analysis from the Climate Prediction Center (CPC). CF identification was carried out objectively by considering (1) the turning of the meridional wind component from north to south and (2) a decrease in air temperature between 1 d before and 1 d after the CF passage. For the period 1991-2008, a mean of 55.3, 53.1 and 51.8 CFs yr-1 were identified, respectively, for RG (observed), REMO and RegCM4. These values show a small bias in the simulated annual frequency of CFs (around -5%), but the underestimation reaches -17% during summer in the RegCM4. In the simulations, it is possible to find some association between seasonal bias of rainfall and the bias of rainfall during CF periods (defined as extending from 2 d before to 2 d after the CF passage) over SLPB. Except in summer, RegCM4 presents stronger biases than REMO for rainfall for both CF periods and overall seasonal climatology. For the winter season, the CF composites indicate that deeper low pressure and larger availability of moisture at low levels (from 2 d before to the day of the CF) contribute to the small underestimation of rainfall in REMO (-5%) compared with RegCM4 (-25%). |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-01-01 2018-12-11T17:23:06Z 2018-12-11T17:23:06Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.3354/cr01358 Climate Research, v. 68, n. 2-3, p. 243-255, 2016. 1616-1572 0936-577X http://hdl.handle.net/11449/176920 10.3354/cr01358 2-s2.0-84966658424 |
url |
http://dx.doi.org/10.3354/cr01358 http://hdl.handle.net/11449/176920 |
identifier_str_mv |
Climate Research, v. 68, n. 2-3, p. 243-255, 2016. 1616-1572 0936-577X 10.3354/cr01358 2-s2.0-84966658424 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Climate Research 0,774 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
243-255 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128776431730688 |