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Spatial and Seasonal Variability of Mixed Layer Depth in the Tropical Atlantic at 10 °W using 40 Years of Observation Data ArchiMer
Kouame Kanga, Désiré; Kouassi Aka, Marcel; Trokourey, Albert; Toualy, Elisée; N’guessan, Benjamin K.; Brehmer, Patrice; Ostrowski, Marek.
The spatial and seasonal variability of the mixed layer depth (MLD) was studied using hydrological data from several databases collected over the period October 1973 to March 2017 at 10 °W between latitudes 2 °N and 10 °S in the Gulf of Guinea. The density threshold method with 0.03 kg m-3 criterion was used to calculate the MLD. In the equatorial band, the seasonal average MLD is 20 m whatever the season. At 6 °S and 10 °S, the MLD is relatively higher during the cold season. The MLD varies between 21 and 37 m at 6 °S, and the seasonal averages MLD are 21 and 40 m respectively during the hot and cold seasons. At 10 °S, during the hot season, the MLD varies between 28 and 52 m and the seasonal average is 39.5 m. During the cold season, the MLD varies...
Tipo: Text Palavras-chave: Atlantic Ocean; Gulf of Guinea; Mixed Layer; Spatial Variability; Seasonal Variability..
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00684/79619/82344.pdf
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Eastern Tropical Atlantic Mixed Layer Depth: Assessment of Methods from In Situ Profiles in the Gulf of Guinea from Coastal to High Sea ArchiMer
N’guessan, Benjamin Kouadio; Kouassi, Aka Marcel; Trokourey, Albert; Toualy, Elisée; Kanga, Desiré Kouamé; Brehmer, Patrice.
To assess the eastern Atlantic tropical mixed layer depth (MLD) at 4°W in the Gulf of Guinea, water temperature and density profiles from over five hundred historical observational Conductivity – Temperature - Depth (CTD) data were used. These data, obtained from key oceanographic survey databases covering 60 years (1956 to 2016) were used for a numerical and visual determination of the MLD. The numerical approach consists of the use of the algorithms of three methods; while the visual estimation of the MLD were made on both temperature and density profiles. The numerical approaches were evaluated by comparing their results on the determination of tropical MLD with those of the visual inspections by means of statistical and graphical analysis in order to...
Tipo: Text Palavras-chave: Mixed layer depth; Gulf of Guinea; Atlantic Ocean; Density; Temperature.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00599/71115/75615.pdf
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