1 23 Ocean Dynamics Theoretical, Computational and Observational Oceanography ISSN 1616-7341 Volume 64 Number 12 Ocean Dynamics (2014) 64:1783-1802 DOI 10.1007/s10236-014-0775-9 Modeled mixed-layer salinity balance in the Gulf of Guinea: seasonal and interannual variability Casimir Y. Da-Allada, Yves du Penhoat, Julien Jouanno, Gael Alory & Norbert Mahouton Hounkonnou