@PhDThesis{Gouveia:2021:DePaTr,
author = "Gouveia, Mainara Biazati",
title = "Determina{\c{c}}{\~a}o dos padr{\~o}es de transporte
Lagrangiano quase-est{\'a}veis no Atl{\^a}ntico Sudoeste e suas
implica{\c{c}}{\~o}es no comportamento de manchas de {\'o}leo",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2021",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2020-08-25",
keywords = "estruturas coerentes Lagrangianas climatol{\'o}gicas,
padr{\~o}es de transporte Lagrangiano persistente, barreira de
transporte, for{\c{c}}a de atra{\c{c}}{\~a}o
climatol{\'o}gica, v{\'o}rtices e meandros persistentes na
corrente do Brasil, climatology of Lagrangian coherent structures,
persistent Lagrangian transport patterns, transport barrier,
climatological strength of attraction, persistent eddy and meander
at Brazilian current.",
abstract = "A Corrente Brasil (CB) {\'e} uma corrente de contorno oeste
fraca, que flui ao longo do Oceano Atl{\^a}ntico Sudoeste. A CB
{\'e} frequentemente descrita como um fluxo com uma intensa
atividade de mesoescala e relativamente baixo transporte de
volume, entre 5,0 a 10,0 Sv. Foi realizada uma
simula{\c{c}}{\~a}o oce{\^a}nica ao longo de 13 anos, a fim de
investigar que a presen{\c{c}}a de meandros e v{\'o}rtices
persistentes est{\~a}o relacionados a padr{\~o}es de transporte
Lagrangiano quase-est{\'a}veis, extra{\'{\i}}dos por meio das
Estruturas Coerentes Lagrangianas climatol{\'o}gicas (ECLc). As
ECLc indicam que o eixo da CB posiciona-se ao longo da
is{\'o}bata de 2000 m, em concord{\^a}ncia com a temperatura da
superf{\'{\i}}cie do mar, obtida atrav{\'e}s do sensor de alta
resolu{\c{c}}{\~a}o e com a velocidade m{\'e}dia Euleriana
simulada. Os padr{\~o}es de deforma{\c{c}}{\~o}es das ECLc
tamb{\'e}m respondem ao transporte transversal persistente {\`a}
plataforma continental identificados com base na
transi{\c{c}}{\~a}o de valores positivos (altos), pr{\'o}ximo
{\`a} linha de costa, para valores negativos (baixos), entre as
is{\'o}batas de 200 a 2000 m, e positivos (altos), al{\'e}m da
is{\'o}bata de 2000 m. Pares zonais de estruturas cicl{\^o}nicas
e anticicl{\^o}nicas s{\~a}o incorporadas nessa
transi{\c{c}}{\~a}o, fazendo com que as ECLc se deformem em
forma de {"}V{"}, doravante chamadas de chevrons. Uma barreira de
transporte {\'e} identificada pr{\'o}xima {\`a} is{\'o}bata de
200 m, confirmada pelo movimento limitado de flutuadores em
dire{\c{c}}{\~a}o {\`a} costa, e indicada por valores
m{\'a}ximos de for{\c{c}}a de atra{\c{c}}{\~a}o
climatol{\'o}gica ao longo do talude. As estruturas persistentes
cicl{\^o}nicas e anticicl{\^o}nicas tamb{\'e}m podem induzir
transporte transversal na plataforma. Regi{\~o}es com baixa
for{\c{c}}a de atra{\c{c}}{\~a}o climatol{\'o}gica coincidem
com plataformas largas e com trajet{\'o}rias estagnadas de
flutuadores. As ECLc representam, com precis{\~a}o, as
trajet{\'o}rias de derivadores sint{\'e}ticos e derivadores
rastreados por sat{\'e}lite iniciados no local do vazamento da
Chevron (em Novembro de 2011) e com o contorno da mancha de
{\'o}leo observada. Tamb{\'e}m h{\'a} uma concord{\^a}ncia
entre as manchas de {\'o}leo que chegaram {\`a}s praias
brasileiras no evento ocorrido de Agosto de 2019 {\`a} Fevereiro
de 2020 e a for{\c{c}}a de atra{\c{c}}{\~a}o climatol{\'o}gica
da regi{\~a}o costeira. Os resultados obtidos no presente
trabalho permitiram determinar a influ{\^e}ncia de persistentes
estruturas coerentes de mesoescala na din{\^a}mica da
circula{\c{c}}{\~a}o regional. A identifica{\c{c}}{\~a}o e a
descri{\c{c}}{\~a}o quantitativa das estruturas coerentes
Lagrangianas climatol{\'o}gicas apresentam grande potencial para
auxiliar no planejamento de respostas futuras de emerg{\^e}ncia
{\`a} derramamentos de {\'o}leo, na elabora{\c{c}}{\~a}o de
planos de conting{\^e}ncia, opera{\c{c}}{\~o}es de resgate,
avalia{\c{c}}{\~a}o de conectividade larval e de peixes,
estrat{\'e}gias para lan{\c{c}}amentos de flutuadores,
dispers{\~a}o e destino de poluentes e lixo marinho. ABSTRACT:
The Brazil Current (BC) is a weak western boundary current flowing
along the Southwestern Atlantic Ocean. It is frequently described
as a flow with intense mesoscale activity and relatively low
volume transport between 5.0 to 10.0 Sv. A 13-year eddy-resolving
primitive-equation simulation was used to show that the presence
of persistent meanders and eddies leads to quasi-steady Lagrangian
transport patterns, aptly extracted through climatological
Lagrangian Coherent Structures (cLCS). The cLCS positions the
surface expression of the BC core along the 2000 m isobath, in
excellent agreement with high resolution satellite sea-surface
temperature and the model Eulerian mean velocity. The cLCS
deformation pattern also responds to zonally persistent
cross-shelf SSH transition from positive (high) values near
coastline to negative (low) values between 200 and 2000 m and back
to positive (high) offshore from the 2000 m isobath.
Zonally-paired cyclonic and anticyclonic structures are embedded
in this transition, also causing the cLCSs to deform into
chevrons. An transport barrier is identified close to the 200 m
isobath, wich ir confirmed by the limited inshore movement of
drogued buoys and accurately indicated by an along slope maxima of
climatological strength of attraction.We also show that the
persistent cyclonic and anticyclonic structures may induce
localized cross-shelf transport. Regions of low climatological
strength of attraction coincide with large shelves and with
stagnant synthetic trajectories. An cLCSs accurately depict
trajectories initiated at the location of Chevrons spill (November
2011) as compared to synthetic and satellite trajectories, and the
outline of the oil from that accident. There is also an agreement
between the large-scale oil slicks reaching the Brazilian beaches
(from August 2019 to February 2020) and the strength of
climatological attraction at the coast. Our work also clarifies
the influence of persistent mesoscale structures on the regional
circulation. The identification and quantitative description of
climatological Lagrangian coherent structures is expected to
improve the effectiveness of future emergency response to oil
spills, contingency planning, rescue operations, larval and fish
connectivity assessment, drifter launch strategies, waste
pollutant and marine debris dispersion and destination.",
committee = "Lorenzzetti, Jo{\~a}o Antonio (presidente) and Gherardi, Douglas
Francisco Marcolino (orientador) and Assireu, Arcilan Trevenzoli
and Assad, Luiz Paulo de Freitas and Bentz, Cristina Maria",
englishtitle = "Determination of the quasi-steady Lagrangian transport patterns in
the Southwestern Atlantic Ocean and their implications for oil
spill ocean surface movement",
language = "pt",
pages = "103",
ibi = "8JMKD3MGP3W34R/434H23P",
url = "http://urlib.net/ibi/8JMKD3MGP3W34R/434H23P",
targetfile = "publicacao.pdf",
urlaccessdate = "03 maio 2024"
}