A simple linear baroclinic numerical model of an equatorial beta-plane ocean is integrated for the Atlantic Ocean. The seasonal increase of westward trade winds in the western Atlantic generates a trapped equatorial disturbance which propagates westward at internal gravity wave speeds and produces strong upwelling along the coast of the Gulf of Guinea. A windstress perturbation of 0.025 Newtons m-2 produces over 20 m of upwelling for over 90 days in the Gulf of Guinea.