Dissipative quasi-geostrophic motion under temporally almost periodic forcing

The full nonlinear dissipative quasi-geostrophic model is shown to have a u nique temporally almost periodic solution when the wind forcing is temporal ly almost periodic under suitable constraints on the spatial square-integra l of the wind forcing and the beta parameter, Ekman number, viscosity, and the domain size. The proof involves the pullback attractor for the associat ed nonautonomous dynamical system. (C) 1999 Academic Press.