Seasonal Response of the Equatorial Atlantic/Programme Fran¿ais Ocean et Climat dans l'Atlantique Equatorial data for 1984 are analyzed to estimate heat fluxes in the interior of the Gulf of Guinea between 1¿N and 4¿N. In this region during May-July the mixed layer, roughly 35 m deep, cools uniformly by nearly 4¿C in 3 months representing a mean rate of heat loss of approximately 70 W/m2. Climatic heat budget calculations by Hastenrath and L¿ mb (1978) show a surface flux heat loss of 30 W/m2 during this time. This suggests that although surface flux makes a significant contribution to the mixed layer cooling, additional divergent heat flux is required to balance the local heat budget. All advective and diffusive terms are estimated to be small except for the meridional eddy heat flux v 'T''. The cospectrum of v and T has a peak near 15 days. At this frequency, v is coherent with the meridional wind. The thermocline displacements forced by this meridional wind are nearly antisymmetric about the equator. The frequency, meridional length scale, and asymmetry of these fluctuations suggest that a second baroclinic Rossby-gravity wave is being locally forced. Thus in the interior of the Gulf of Guinea the eddy flux driven by the fortnightly wind fluctuations makes a significant contribution to the cooling of the mixed layer during the seasonal upwelling. This is in contrast to the central and western equatorial Atlantic Ocean, where a meridional heat flux is produced by 25 to 30 day fluctuations generated by current instabilities. ¿American Geophysical Union 1987