On the influence of stratospheric conditions on forced tropospheric waves in a steady‐state primitive equation model

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Abstract
The structure of a forced planetary wave is computed by means of a linearized steady‐state primitive equation model on a hemisphere. The vertical velocity in pressure coordinates is specified at the lower boundary to simulate orographie forcing. The vertical finite differences are on equally spaced pressure levels with a moderately high vertical resolution. The upper boundary condition dp/dt = 0 is applied at p =0 in the model. Numerical experiments show that the tropospheric structure of forced planetary waves is sensitive to the stratospheric background conditions in the model.