Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da USP |
Texto Completo: | http://www.teses.usp.br/teses/disponiveis/21/21135/tde-09042018-125458/ |
Resumo: | Through analysis of large-scale ocean gyre dynamics from simulation results of the ocean component of the Community Earth System Model version 1 - the Parallel Ocean Program version 2 (CESM1-POP2) - this study builds upon existing research suggesting recent changes in the circulation of global subtropical gyres with respect to the South Atlantic Ocean. Results all point to an increase in the total counterclockwise circulation and a southward displacement of the sub- tropical gyre system. The northern boundary of the South Atlantic Subtropical Gyre (SASG) is represented by the bifurcation of the southern branch of the South Equatorial Current (sSEC) into the North Brazil Undercurrent/Current (NBUC/NBC) to the north and the Brazil Current (BC) to the south. The sSEC Bifurcation Latitude (SBL) dictates the partition between waters flowing poleward and those flowing equatorward. Although a northward migration of the SBL would be expected with the gyre spin up and associated poleward transport increase, the SBL migrates southwards at a rate of 0.051o/yr, in conjunction to a substantial increase in the equatorward advection of waters within the sSEC-SBL-NBUC system, which is included in the upper-branch of the Atlantic Meridional Overturning Circulation. |
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Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st centuryMudanças na circulação do Giro Subtropical do Atlântico Sul do século 20 para o século 21Circulação de giro subtropicalLatitude da Bifurcação da CSEsMigração para sulOceano Atlântico SulSouth Atlantic OceanSouthward migrationsSEC Bifurcation LatitudeSubtropical gyre circulationThrough analysis of large-scale ocean gyre dynamics from simulation results of the ocean component of the Community Earth System Model version 1 - the Parallel Ocean Program version 2 (CESM1-POP2) - this study builds upon existing research suggesting recent changes in the circulation of global subtropical gyres with respect to the South Atlantic Ocean. Results all point to an increase in the total counterclockwise circulation and a southward displacement of the sub- tropical gyre system. The northern boundary of the South Atlantic Subtropical Gyre (SASG) is represented by the bifurcation of the southern branch of the South Equatorial Current (sSEC) into the North Brazil Undercurrent/Current (NBUC/NBC) to the north and the Brazil Current (BC) to the south. The sSEC Bifurcation Latitude (SBL) dictates the partition between waters flowing poleward and those flowing equatorward. Although a northward migration of the SBL would be expected with the gyre spin up and associated poleward transport increase, the SBL migrates southwards at a rate of 0.051o/yr, in conjunction to a substantial increase in the equatorward advection of waters within the sSEC-SBL-NBUC system, which is included in the upper-branch of the Atlantic Meridional Overturning Circulation.Através de análises da dinâmica de grande-escala do giro oceânico, proveniente dos resultados de simulação da componente oceânica do Community Earth System Model versão 1 - o Parallel Ocean Program versão 2 (CESM1-POP2) - este estudo se baseia em estudos prévios sugerindo mudanças recentes na circulação dos giros subtropicais globais, com respeito ao oceano Atlântico Sul. Os resultados apontam para uma intensificação da circulação anti-horária e um deslocamento para sul de todo o sistema do giro subtropical. A borda norte do Giro Subtropical do Atlântico Sul (GSAS) é representada pela bifurcação do ramo sul da Corrente Sul Equatorial (CSEs) em Subcorrente/Corrente Norte do Brasil (SCNB/CNB) para norte e Corrente do Brasil (CB) para sul. A Latitude da Bifurcação da CSEs (LBC) determina a partição entre as águas fluindo em direção ao pólo e aquelas fluindo em direção ao equador. Embora seja esperada uma migração para norte da LBC com a aceleração da circulação do giro e consequente aumento do transporte em direção ao pólo, a LBC migra para sul a uma taxa de 0.051o/ano. Esta migração ocorre em conjunto à um aumento substancial na advecção de águas em direção ao equador com o sistema CSEs-LBC-SCNB, o qual está incluso no ramo superior da Circulação de Revolvimento Meridional do Atlântico.Biblioteca Digitais de Teses e Dissertações da USPWainer, Ilana Elazari Klein CoaracyOliveira, Fernanda Marcello de2017-03-09info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://www.teses.usp.br/teses/disponiveis/21/21135/tde-09042018-125458/reponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USPLiberar o conteúdo para acesso público.info:eu-repo/semantics/openAccesseng2018-07-19T20:50:39Zoai:teses.usp.br:tde-09042018-125458Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212018-07-19T20:50:39Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century Mudanças na circulação do Giro Subtropical do Atlântico Sul do século 20 para o século 21 |
title |
Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century |
spellingShingle |
Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century Oliveira, Fernanda Marcello de Circulação de giro subtropical Latitude da Bifurcação da CSEs Migração para sul Oceano Atlântico Sul South Atlantic Ocean Southward migration sSEC Bifurcation Latitude Subtropical gyre circulation |
title_short |
Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century |
title_full |
Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century |
title_fullStr |
Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century |
title_full_unstemmed |
Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century |
title_sort |
Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century |
author |
Oliveira, Fernanda Marcello de |
author_facet |
Oliveira, Fernanda Marcello de |
author_role |
author |
dc.contributor.none.fl_str_mv |
Wainer, Ilana Elazari Klein Coaracy |
dc.contributor.author.fl_str_mv |
Oliveira, Fernanda Marcello de |
dc.subject.por.fl_str_mv |
Circulação de giro subtropical Latitude da Bifurcação da CSEs Migração para sul Oceano Atlântico Sul South Atlantic Ocean Southward migration sSEC Bifurcation Latitude Subtropical gyre circulation |
topic |
Circulação de giro subtropical Latitude da Bifurcação da CSEs Migração para sul Oceano Atlântico Sul South Atlantic Ocean Southward migration sSEC Bifurcation Latitude Subtropical gyre circulation |
description |
Through analysis of large-scale ocean gyre dynamics from simulation results of the ocean component of the Community Earth System Model version 1 - the Parallel Ocean Program version 2 (CESM1-POP2) - this study builds upon existing research suggesting recent changes in the circulation of global subtropical gyres with respect to the South Atlantic Ocean. Results all point to an increase in the total counterclockwise circulation and a southward displacement of the sub- tropical gyre system. The northern boundary of the South Atlantic Subtropical Gyre (SASG) is represented by the bifurcation of the southern branch of the South Equatorial Current (sSEC) into the North Brazil Undercurrent/Current (NBUC/NBC) to the north and the Brazil Current (BC) to the south. The sSEC Bifurcation Latitude (SBL) dictates the partition between waters flowing poleward and those flowing equatorward. Although a northward migration of the SBL would be expected with the gyre spin up and associated poleward transport increase, the SBL migrates southwards at a rate of 0.051o/yr, in conjunction to a substantial increase in the equatorward advection of waters within the sSEC-SBL-NBUC system, which is included in the upper-branch of the Atlantic Meridional Overturning Circulation. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-03-09 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.teses.usp.br/teses/disponiveis/21/21135/tde-09042018-125458/ |
url |
http://www.teses.usp.br/teses/disponiveis/21/21135/tde-09042018-125458/ |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
|
dc.rights.driver.fl_str_mv |
Liberar o conteúdo para acesso público. info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Liberar o conteúdo para acesso público. |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.coverage.none.fl_str_mv |
|
dc.publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da USP instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Biblioteca Digital de Teses e Dissertações da USP |
collection |
Biblioteca Digital de Teses e Dissertações da USP |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br |
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1815256829669670912 |