On forced barotropic vorticity oscillations

摘要: Abstract Forced, nonresonant barotropic response at low frequencies (ω ≪ f) and large scales (L ∼ f/β) can be written in terms of a streamfunction, which is similar to the quasigeostrophically derived streamfunction. However, “nearly equilibrium” forced vorticity equation valid on planetary length scale influenced not only by vortex stretching induced driving mechanism (tides, atmospheric pressure, or Ekman-pumping displacement) but also β coupling divergent velocity field nearly equilibrium response. A result follows for topographic coupling, albeit scale.