Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil

Detalhes bibliográficos
Autor(a) principal: Araujo, M.
Data de Publicação: 2011
Outros Autores: Limongi, C., Servain, J., Silva, M., Leite, F. S., Veleda, D., 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/5574
Resumo: p. 63-73.
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spelling Araujo, M.Limongi, C.Servain, J.Silva, M.Leite, F. S.Veleda, D.Lentini, Carlos Alessandre DomingosAraujo, M.Limongi, C.Servain, J.Silva, M.Leite, F. S.Veleda, D.Lentini, Carlos Alessandre Domingos2012-03-29T13:56:50Z2012-03-29T13:56:50Z20111812-0784http://www.repositorio.ufba.br/ri/handle/ri/5574v. 7, n. 1p. 63-73.High-resolution hydrographic observations of temperature and salinity are used to analyze the formation and distribution of isothermal depth (ZT), mixed depth (ZM) and barrier layer thickness (BLT) in a section of the southwestern Atlantic (0º30´N–14°OO`S; 31 240–41 480 W), adjacent to the northeastern Brazilian coast. Analyzed data consists of 279 CTD casts acquired during two cruises under the Brazilian REVIZEE Program. One occurred in late austral winter (August–October 1995) and another in austral summer (January–April 1997). Oceanic observations are compared to numerical modeling results obtained from the French Mercator-Coriolis Program. Results indicate that the intrusion of subtropical Salinity MaximumWaters (SMW) is the major process contributing to the seasonal barrier layer formation. These waters are brought by the South Equatorial Current (SEC), from the subtropical region, into the western tropical Atlantic boundary. During late austral winter southeastern trade winds are more intense and ITCZ precipitations induce lower surface salinity values near the equator. During this period a 5–90m thick BLT (median=15 m) is observed and BLT>30m is restricted to latitudes higher than 8 S, where the intrusion of salty waters between 8 –12.3 Screates shallow mixed layers over deep (ZT 90 m) isothermal layers. During austral summer, shallow isothermal and mixed layers prevail, when northeasterly winds are predominant and evaporation overcomes precipitation, causing saltier waters at the surface/subsurface layers. During that period observed BLT varies from 5 to 70m and presents thicker median value of 35 m, when comparing to the winter. Furthermore, BLT 30m is observed not only in the southernmost part of the study area, as verified during late winter, but in the latitude range 2 –14 S, where near-surface salty waters are transported westward by the SEC flow. These results indicate that the inclusion of salinity dynamics and its variability are necessary for studying mixed and barrier layer behaviors in the tropical Atlantic, where ocean-atmosphere coupling is known to be stronger.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-03-29T13:56:50Z No. of bitstreams: 1 __www.ocean-sci.net_7_63_2011_os-7-63-2011.pdf: 5061005 bytes, checksum: 3caf166cbeded252eaac0e891541bfa4 (MD5)Made available in DSpace on 2012-03-29T13:56:50Z (GMT). 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dc.title.pt_BR.fl_str_mv Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil
dc.title.alternative.pt_BR.fl_str_mv Ocean Science
title Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil
spellingShingle Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil
Araujo, M.
title_short Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil
title_full Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil
title_fullStr Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil
title_full_unstemmed Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil
title_sort Salinity-induced mixed and barrier layers in the southwestern tropical Atlantic Ocean off the northeast of Brazil
author Araujo, M.
author_facet Araujo, M.
Limongi, C.
Servain, J.
Silva, M.
Leite, F. S.
Veleda, D.
Lentini, Carlos Alessandre Domingos
author_role author
author2 Limongi, C.
Servain, J.
Silva, M.
Leite, F. S.
Veleda, D.
Lentini, Carlos Alessandre Domingos
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Araujo, M.
Limongi, C.
Servain, J.
Silva, M.
Leite, F. S.
Veleda, D.
Lentini, Carlos Alessandre Domingos
Araujo, M.
Limongi, C.
Servain, J.
Silva, M.
Leite, F. S.
Veleda, D.
Lentini, Carlos Alessandre Domingos
description p. 63-73.
publishDate 2011
dc.date.issued.fl_str_mv 2011
dc.date.accessioned.fl_str_mv 2012-03-29T13:56:50Z
dc.date.available.fl_str_mv 2012-03-29T13:56:50Z
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/5574
dc.identifier.issn.none.fl_str_mv 1812-0784
dc.identifier.number.pt_BR.fl_str_mv v. 7, n. 1
identifier_str_mv 1812-0784
v. 7, n. 1
url http://www.repositorio.ufba.br/ri/handle/ri/5574
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 DOI: 10.5194/os-7-63-2011
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
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