A Remark on the Three Dimensional Baroclinic Quasigeostrophic Dynamics
  We consider time-periodic patterns of the dissipative three dimensional baroclinic quasigeostrophic model in spherical coordinates, under time-dependent forcing. We show that when the forcing is time-periodic and the spatial square-integral of the forcing is bounded in time, the model has time-periodic solutions. 
Jinqiao Duan