@PhDThesis{Cabrera:2023:InMeOc,
author = "Cabrera, Mylene Jaen",
title = "Influ{\^e}ncia da mesoescala oce{\^a}nica na atmosfera em
m{\'e}dias e altas latitudes no Oceano Atl{\^a}ntico sudoeste",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2023",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2023-06-20",
keywords = "mesoescala oce{\^a}nica, intera{\c{c}}{\~a}o oceano-atmosfera,
gelo marinho ant{\'a}rtico, modelagem acoplada, Oceano
Atl{\^a}ntico sudoeste, oceanic mesoscale, ocean-atmosphere
interaction, southern sea ice, coupled modeling, southwestern
Atlantic Ocean.",
abstract = "O objetivo geral da presente tese {\'e} estudar a influ{\^e}ncia
da mesoescala oce{\^a}nica na atmosfera nos setores sudoeste e
austral do Oceano Atl{\^a}ntico. Experimentos num{\'e}ricos
foram realizados empregando um modelo regional acoplado,
utilizando as componentes atmosf{\'e}rica, oce{\^a}nica e de
gelo marinho. Um filtro espacial bidimensional foi usado no
acoplador do modelo para filtrar alta frequ{\^e}ncia termal da
superf{\'{\i}}cie do oceano, associada {\`a} mesoescala
oce{\^a}nica. Dessa forma, dois tipos de experimentos foram
realizados, experimentos onde a mesoescala oce{\^a}nica se
encontra atuando e experimentos onde um campo suavizado de TSM
{\'e} fornecido para o modelo atmosf{\'e}rico. A
diferen{\c{c}}a destes experimentos permitiu obter campos de
anomalias de vari{\'a}veis atmosf{\'e}ricas moduladas pela
mesoescala oce{\^a}nica. A presen{\c{c}}a de gelo marinho e sua
extens{\~a}o influencia na mesoescala oce{\^a}nica observada na
regi{\~a}o de estudo. Com o objetivo de estudar o papel da
mesoescala oce{\^a}nica para um per{\'{\i}}odo de m{\'a}xima e
outro de m{\'{\i}}nima extens{\~a}o do gelo marinho, dois
per{\'{\i}}odos de simula{\c{c}}{\~a}o foram definidos para os
experimentos num{\'e}ricos, setembro de 2019 e fevereiro de 2020.
De forma geral, a distribui{\c{c}}{\~a}o das anomalias
m{\'e}dias da TSM para os dois per{\'{\i}}odos n{\~a}o
apresentou mudan{\c{c}}a significativa, sendo observadas as
maiores anomalias na regi{\~a}o da Conflu{\^e}ncia
Brasil-Malvinas (CBM) e ao longo da frente subant{\'a}rtica e da
frente polar. No entanto, uma diminui{\c{c}}{\~a}o na magnitude
das anomalias m{\'e}dias de TSM {\'e} observada para o m{\^e}s
de fevereiro, principalmente para as anomalias positivas da TSM
(os m{\'a}ximos das anomalias m{\'e}dias de TSM para o m{\^e}s
de setembro foram de 4.23 e -3.71 °C e de 2.18 e -3.06 °C para o
m{\^e}s de fevereiro). A influ{\^e}ncia da mesoescala
oce{\^a}nica foi verificada no campo de temperatura do ar a 2m
(anomalias m{\'e}dias m{\'a}ximas de 1.09 e -1.92 °C para o
m{\^e}s de setembro e 0.99 e -1.52 °C para o m{\^e}s de
fevereiro), vento em superf{\'{\i}}cie, press{\~a}o ao
n{\'{\i}}vel m{\'e}dio do mar e no balan{\c{c}}o de energia
l{\'{\i}}quida na superf{\'{\i}}cie (anomalias m{\'e}dias
m{\'a}ximas de 178.88 e -115.03 W {m\−2} para o m{\^e}s
de setembro e 95.71 e -98.78 W {m\−2} para o m{\^e}s de
fevereiro). Esta influ{\^e}ncia levou a modifica{\c{c}}{\~o}es
na estrutura vertical da atmosfera, observandose atrav{\'e}s do
desenvolvimento da camada limite atmosf{\'e}rica marinha (CLAM) e
a propaga{\c{c}}{\~a}o na vertical de anomalias m{\'e}dias da
temperatura potencial equivalente na atmosfera livre, acima da
CLAM. A modula{\c{c}}{\~a}o na precipita{\c{c}}{\~a}o nos
meses de estudo {\'e} tamb{\'e}m verificada, observa-se que esta
modula{\c{c}}{\~a}o n{\~a}o foi somente na regi{\~a}o
oce{\^a}nica de maior atividade de mesoescala mas tamb{\'e}m na
regi{\~a}o continental adjacente. O acoplamento din{\^a}mico
vento-corrente tamb{\'e}m foi considerado, verifica-se que este
acoplamento diminui a atividade de mesoescala oce{\^a}nica,
principalmente na regi{\~a}o da CBM e pr{\'o}ximo {\`a}
Passagem de Drake na Corrente Circumpolar Ant{\'a}rtica. Este
estudo apresenta uma nova abordagem sobre o acoplamento
(termodin{\^a}mico e din{\^a}mico) da atmosfera e o oceano na
mesoescala sobre a regi{\~a}o de estudo. ABSTRACT: The main goal
of this study is to define the influence of the oceanic mesoscale
on the atmosphere in the southwestern and southern sectors of the
Atlantic Ocean. Numerical experiments were performed using a
coupled regional model, using atmosphere, ocean, and sea ice
components. A two-dimensional spatial filter was used in the model
coupler to filter high-frequency ocean surface thermals associated
with the ocean mesoscale. Thus, two types of experiments were
performed, one where the oceanic mesoscale is acting and the other
where a smoothed SST field is provided for the atmospheric model.
The difference between these experiments made it possible to
obtain atmospheric variables anomalies modulated by the oceanic
mesoscale. The presence of sea ice and its extent influences the
oceanic mesoscale observed in the study region. To study the role
of the oceanic mesoscale for the maximum and minimum of sea ice,
two simulation periods were defined for the numerical experiments,
September 2019 and February 2020. The mean SST anomalies for the
two periods did not change significantly, with the most
significant anomalies being observed in the Brazil-Malvinas
Confluence (BMC) region and along the subantarctic and polar
fronts. However, a decrease in the magnitude of the mean SST
anomalies is observed for February, mainly for the positive SST
anomalies (the maximums of the mean SST anomalies for September
were 4.23 and -3.71 °C and 2.18 and -3.06 °C for February). The
influence of the oceanic mesoscale was verified in the air
temperature at 2m (maximum mean anomalies of 1.09 and -1.92 °C for
September and 0.99 and -1.52 °C for February), surface wind, sea
level pressure, and net energy balance at the surface (maximum
mean anomalies of 178.88 and -115.03 W {m\−2} for September
and 95.71 and -98.78 W {m\−2} for February). This influence
induces changes in the vertical structure of the atmosphere,
observed through the development of the marine atmospheric
boundary layer (MABL) and the vertical propagation of mean
anomalies of the equivalent potential temperature in the free
atmosphere above the MABL. The modulation in precipitation in the
months of study is also verified. It is observed that this
modulation was not only in the oceanic region of more mesoscale
activity but also in the adjacent continental region. The dynamic
wind-current coupling was also considered. Here, it is verified
that this coupling decreases the oceanic mesoscale activity,
mainly in the BMC region and near the Drake Passage in the
Antarctic Circumpolar Current. This study presents a new approach
to the coupling (thermodynamic and dynamic) of the atmosphere and
the ocean at the mesoscale over the study region.",
committee = "Fisch, Gilberto Fernando (presidente) and Pezzi, Luciano Ponzi
(orientador) and Velho, Haroldo Fraga de Campos and Souza,
Everaldo Barreiros de and Assad, Luiz Paulo de Freitas",
englishtitle = "The influence of oceanic mesoscale on the atmosphere at mid- and
high-latitudes in the southwestern Atlantic Ocean",
language = "pt",
pages = "94",
ibi = "8JMKD3MGP3W34T/49DJ9KE",
url = "http://urlib.net/ibi/8JMKD3MGP3W34T/49DJ9KE",
targetfile = "publicacao.pdf",
urlaccessdate = "20 maio 2024"
}