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Master's Dissertation
DOI
10.11606/D.21.2017.tde-24022017-162716
Document
Author
Full name
Piero Silveira Bernardo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Sato, Olga Tiemi (President)
Ambrizzi, Tercio
Wainer, Ilana Elazari Klein Coaracy
Title in Portuguese
Estudo da variação espaço-temporal da Água Modal Subtropical do Atlântico Sul
Keywords in Portuguese
Água Modal Subtropical do Atlântico Sul
balanço de calor pela superfície
ISAS
OAFlux
taxa de formação
Abstract in Portuguese
Águas modais são formações oceânicas caracterizadas por camadas de propriedades praticamente homogêneas. Isso pode ser observada tanto através de baixos gradientes verticais de temperatura e salinidade, quanto de baixos valores de vorticidade potencial (VP). Portanto, para avaliarmos a formação da Água Modal Subtropical do Atlântico Sul (AMSTAS) foi utilizado o conjunto de dados In Situ Analysis System (ISAS - IFREMER) entre 2002 e 2014 para a região de 20ºS a 45ºS. Em conjunto aos critérios de Sato e Polito (2014) para a identificação da AMSTAS foram aplicados um novo intervalo de temperatura (13ºC a 16ºC) e a utilização de um gradiente vertical de temperatura (dT/dz = 0,02ºC m-1), tanto em superfície, de julho a novembro, quanto em subsuperfície durante todo o ano. Desse modo, os perfis selecionados foram utilizados para avaliar a variação do volume das camadas de AMSTAS. Na camada de superfície, buscou-se identificar os perfis que haviam sido recentemente afetados pela convecção local, que representa o principal mecanismo para a formação das águas modais, apenas entre julho e outubro. Para tanto, reduziu-se o valor máximo de VP dos perfis para 1,2 × 10-11 m-1 s-1. A partir da aplicação desse critério mais restritivo, calculou-se a taxa de formação de AMSTAS (Δ f) mensal, entre 2002 e 2009, para compararmos com a taxa de formação estimada (ΔF) pela teoria de Walin (1982), utilizando os dados do projeto Objectively Analyzed air-sea Fluxes (OAFlux). O Δ f apresentou média inferior a ΔF, indicando assim a necessidade de avaliarmos o conjunto de processos que afetam a formação da AMSTAS, em adição ao balanço de calor pela superfície.
Title in English
Study of the spatio-temporal variation of the South Atlantic Subtropical Mode Water
Keywords in English
formation rate
ISAS
OAFlux
South Atlantic Subtropical Mode Water
surface net heat balance
Abstract in English
Mode waters are oceanic formations characterized by layers of nearly homogeneous properties. This feature can be observed both at low temperature and salinity vertical gradients, as in low potential vorticity (PV) values. Therefore, to evaluate the formation of South Atlantic Subtropical Mode Water (SASTMW) the In Situ Analysis System (ISAS - IFREMER) data set was used for the period between 2002 and 2014 for the 20ºS to 45ºS region. Jointly with the criteria set by Sato e Polito (2014) for the identification of the SASTMW were applied a new temperature range (13ºC a 16ºC) and the use of a vertical temperature gradient (dT/dz = 0.02ºCm-1 both in surface, between June and November, as in the subsurface throughout the year. Thus, the selected profiles were used to evaluate changes in the volume of the layers of SASTMW. Within the surface layer data, we sought to identify profiles that had been recently affected by the local convection, which is the main mechanism for the formation of mode water, only between July to October. Thereby, we reduced the maximum PV value of the profiles to 1.2 × 10-11 m-1 s-1. From the application of this more restrictive criteria, we calculated the SASTMW monthly formation rate (Δf) between 2002 and 2009 to compare with the estimated formation rate (ΔF) from the Walin (1982) theory, using the data from the project Objectively Analyzed air-sea Fluxes (OAFlux). The Δ f showed a mean value lower than the ΔF rate, indicating the need to evaluate a broader set of processes that affect the SASTMW formation, in addition to the heat balance through the surface.
 
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Publishing Date
2017-03-03
 
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