Da-Allada C.Y. auteur aut IRD Alory G. auteur aut IRD Penhoat Yves du auteur aut IRD Kestenare Elodie auteur aut IRD Durand Fabien auteur aut IRD Hounkonnou N. M. auteur aut IRD text journalArticle eng text/pdf born digital access We investigate the causes of the seasonal cycle of the near-surface salinity using a mixed-layer salinity model and a combination of satellite products, atmospheric reanalyses, and in situ observations for the period 2000-2008, in the tropical Atlantic Ocean. We find that the balance differs from one region to another. In the western tropical Atlantic, it is controlled by horizontal advection from March to November and by freshwater flux and entrainment for the rest of the year. In the central tropical Atlantic, it is mainly due to the strong contribution of precipitation in agreement with previous results. In the northeastern tropical Atlantic, all terms contribute to the mixed layer salinity between December and March; during the rest of the year, precipitation and zonal advection mainly control the balance. In the Gulf of Guinea, it is driven by freshwater flux from October to February; from March to July, it is controlled by horizontal advection and entrainment; from August to September, mixed-layer salinity variability is weak. Finally, in the Congo region, it is driven by freshwater flux (precipitation and runoff from Congo River) from September to December, by horizontal advection during January to March, and by vertical entrainment during the rest of the year (April to August). There are some discrepancies between observed and modeled salinity tendencies. Some of them are due to our model formulation, which does not explicitly account for the effect of vertical diffusion. Uncertainties of observation products, which force the model, are also sources of errors. specialized ATLANTIQUE ZONE TROPICALE 032 118 1 332-345 2013 0148-0227 https://www.documentation.ird.fr/hor/fdi:010060862 10.1029/2012jc008357 0148-0227 [F B010060862] https://www.documentation.ird.fr/hor/fdi:010060862 https://www.documentation.ird.fr/intranet/publi/2013/05/010060862.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2013-05-31 2021-04-05 fdi:010060862 fre