High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic

Detalhes bibliográficos
Autor(a) principal: Silva, Marcus
Data de Publicação: 2009
Outros Autores: Araujo, Moacyr, Servain, Jacques, Penven, Pierrick, Lentini, Carlos Alessandre Domingos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/5912
Resumo: Acesso restrito: Texto completo. p. 256-269
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spelling Silva, MarcusAraujo, MoacyrServain, JacquesPenven, PierrickLentini, Carlos Alessandre DomingosSilva, MarcusAraujo, MoacyrServain, JacquesPenven, PierrickLentini, Carlos Alessandre Domingos2012-05-18T12:21:16Z20091463-5003http://www.repositorio.ufba.br/ri/handle/ri/5912v. 30, n. 4Acesso restrito: Texto completo. p. 256-269The southwestern tropical Atlantic (05 S–25 S/20 W–47 W), where part of the South Equatorial Current(SEC) enters at its eastern border, is of particular interest as it is fed by many western boundary currents along the eastern Brazilian continental shelf. However, the long-term variability of the dynamics in this region, which are also important as they contribute to the climate over northeastern Brazil, is largely unknown. We use the Regional Ocean Model System (ROMS) here for the first time in this area to simulate the ocean circulation with an isotropic horizontal grid resolution of 1/12 and 40 terrain-following layers. As a primary evaluation of the ROMS configuration, we explore surface and vertical thermal structures, the surface mixed layer, and mass transports within the upper levels. Interannual variability results are compared with the first two-year series of observed thermal profiles derived from the three PIRATASWE moorings. The simulated thermal structure in the upper ocean layers agrees well with in-situ data. ROMS simulations point out a broad and relatively weak SEC flow composed of a sequence of more or less defined near-surface cores. The westward SEC transport for the upper 400 m along the PIRATA-SWE section, calculated from the ROMS simulation for 2005–2007, shows an average volume transport of 14.9 Sv, with a maximum observed in JFM (15.7 Sv), and a minimum during MJJ (13.8 Sv). ROMS results indicate that the 2005–2007 seasonal near-surface westward SEC transport is modulated by the zonal wind variability. Three zonal sections extending from the American continent to the PIRATA buoy sites confirm that stronger northward NBUC transport and decreasing BC transport were achieved during May 2006 and May 2007, i.e. at the time the sSEC bifurcation reaches its southernmost position. On the other hand, the maximum southward BC flow was verified during January 2006, January 2007 and March 2007, with a minimum northward NBUC flow in December 2005 and October/December 2006, corresponding to the period when the sSEC bifurcation reaches its lowest latitude (OND). Sea Surface Height (SSH) and the surface Eddy Kinetic Energy (EKE) derived from simulations and AVISO Rio05 product point out the highest surface meso-scale activity (EKEP50 cm2 s 2) along the cSEC and NBUC/BC patches. Preliminary results provide additional ingredients in the complexity of the SEC divergence region and encourage us to conduct a more detailed exploration of the dynamics of this region using the ROMS. This also shows the need to continue, extend, and vertically upgrade the observational PIRATA-SWE array system, especially with more levels of salinity measurements and the installation of current measurements.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-05-18T12:21:16Z No. of bitstreams: 1 __ac.els-cdn.com_S146350...705843694c447bc8b653f9a100bc6.pdf: 1444992 bytes, checksum: 09ed977d79eb918abcc1712797b0f8da (MD5)Made available in DSpace on 2012-05-18T12:21:16Z (GMT). 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dc.title.pt_BR.fl_str_mv High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic
dc.title.alternative.pt_BR.fl_str_mv OCEAN MODELLING
title High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic
spellingShingle High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic
Silva, Marcus
Southwestern tropical Atlantic
Upper ocean
PIRATA-SWE moorings
ROMS
South equatorial current
title_short High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic
title_full High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic
title_fullStr High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic
title_full_unstemmed High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic
title_sort High-resolution regional ocean dynamics simulation in the southwestern tropical Atlantic
author Silva, Marcus
author_facet Silva, Marcus
Araujo, Moacyr
Servain, Jacques
Penven, Pierrick
Lentini, Carlos Alessandre Domingos
author_role author
author2 Araujo, Moacyr
Servain, Jacques
Penven, Pierrick
Lentini, Carlos Alessandre Domingos
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Silva, Marcus
Araujo, Moacyr
Servain, Jacques
Penven, Pierrick
Lentini, Carlos Alessandre Domingos
Silva, Marcus
Araujo, Moacyr
Servain, Jacques
Penven, Pierrick
Lentini, Carlos Alessandre Domingos
dc.subject.por.fl_str_mv Southwestern tropical Atlantic
Upper ocean
PIRATA-SWE moorings
ROMS
South equatorial current
topic Southwestern tropical Atlantic
Upper ocean
PIRATA-SWE moorings
ROMS
South equatorial current
description Acesso restrito: Texto completo. p. 256-269
publishDate 2009
dc.date.issued.fl_str_mv 2009
dc.date.accessioned.fl_str_mv 2012-05-18T12:21:16Z
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://www.repositorio.ufba.br/ri/handle/ri/5912
dc.identifier.issn.none.fl_str_mv 1463-5003
dc.identifier.number.pt_BR.fl_str_mv v. 30, n. 4
identifier_str_mv 1463-5003
v. 30, n. 4
url http://www.repositorio.ufba.br/ri/handle/ri/5912
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.ocemod.2009.07.002
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
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