2010
DOI: 10.1590/s1679-87592010000700008
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Study of the equatorial Atlantic Ocean mixing layer using a one-dimensional turbulence model

Abstract: A B S T R A C TThe General Ocean Turbulence Model (GOTM) is applied to the diagnostic turbulence field of the mixing layer (ML) over the equatorial region of the Atlantic Ocean. Two situations were investigated: rainy and dry seasons, defined, respectively, by the presence of the intertropical convergence zone and by its northward displacement. Simulations were carried out using data from a PIRATA buoy located on the equator at 23 o W to compute surface turbulent fluxes and from the NASA/GEWEX Surface Radiatio… Show more

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Cited by 3 publications
(4 citation statements)
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“…The surface waters (<20m) off the western coast of Fernando de Noronha, in the most touristic and highly populated area continue to be occupied by incredible life forms. The oligotrophic conditions confirm the transport of equatorial surface water by the NBUC as observed in the Equatorial Atlantic circulation models described by some authors (Molinari et al, 1981;Bourlès, et al, 1999;Mémery et al, 2000;Skielka et al, 2010). Around oceanic islands, sometimes the raising of the thermocline into the euphotic zone induced by seamount structures results in a Taylor-column, as mentioned by Boehlert and Mundy (1993), though no sign of upwelling was observed, a low level of inorganic nutrients persisting in the coastal fringe studied.…”
Section: Discussionsupporting
confidence: 87%
See 1 more Smart Citation
“…The surface waters (<20m) off the western coast of Fernando de Noronha, in the most touristic and highly populated area continue to be occupied by incredible life forms. The oligotrophic conditions confirm the transport of equatorial surface water by the NBUC as observed in the Equatorial Atlantic circulation models described by some authors (Molinari et al, 1981;Bourlès, et al, 1999;Mémery et al, 2000;Skielka et al, 2010). Around oceanic islands, sometimes the raising of the thermocline into the euphotic zone induced by seamount structures results in a Taylor-column, as mentioned by Boehlert and Mundy (1993), though no sign of upwelling was observed, a low level of inorganic nutrients persisting in the coastal fringe studied.…”
Section: Discussionsupporting
confidence: 87%
“…In equatorial waters, the variations of the sea surface temperature (SST) result from an important air-sea interaction process evident in the Tropical Atlantic Ocean, where variations of wind-induced vertical mixing and the vertical and horizontal advection of heat occur, as evidenced by several authors (Weingartner and Weisberg, 1991;Yu et al, 2010;Skielka et al, 2010). Considering this oceanic region, the entire Fernando de Noronha archipelago, it comes under the influence of the central branch of the South Equatorial Current (CSEC), flowing from E to W (≈30 cm.s -1 ) between the surface and a nominal depth of 100m.…”
Section: Discussionmentioning
confidence: 99%
“…A superfície do oceano, nesta região, é supersaturada de CO 2 em relação ao ar e o sentido do fluxo é, na média anual, do oceano para a atmosfera. Além disso, como explica Libes(2009), lugares sujeitos a eventos de ressurgência, como o oceano Atlântico equatorial(Skielka et al, 2010), trazem águas mais profundas, ricas em CO 2 , para a superfície. Uma vez que essas águas frias e ricas em CO 2 entram na camada de mistura oceânica equatorial, elas se aquecem.…”
unclassified
“…Dessa forma, apresenta resultados fisicamente mais consistentes na ausência de processos advectivos horizontais, na presença de ventos com velocidade superior a 6 m s -1 e em períodos de grande incidência de radiação solar. Conforme mostrado porSkielka et al (2010), dos dados disponíveis na região, o período que mais se assemelha a essas indicações é o segundo semestre de cada ano, quando a ZCIT não se encontra mais sobre a região investigada neste trabalho, há pouca precipitação, há grande intensidade de radiação solar incidente na superfície, o regime de ventos é mais intenso e há pouca contribuição de processos advectivos horizontais.Dos meses do segundo semestre, o escolhido foi o de agosto, pois, como será discutido na seção 2.2 em diante, além de apresentar as características físicas buscadas, foi o único do segundo semestre do ano onde havia dados de pressão parcial e de fração molar do CO 2 disponíveis tanto no oceano quanto na atmosfera, na região investigada. Os dados oceanográficos e meteorológicos utilizados neste trabalho foram obtidos in situ por uma bóia oceanográfica do Prediction and Research Moored Array over the Tropical Atlantic Ocean (PIRATA;Servain et al, 1998; Bourlès et al, 2008) fundeada em (0°, 23°W).…”
unclassified