Abstract
Basic features of the observed auto- and crosscovariance functions of the axial global angular momentum and of the related mountain and friction torques are interpreted in the light of a simple linear β-plane model. Rossby waves are exited by white noise forcing in this barotropic model. Their propagation over a topographic feature yields mountain torques which act on the angular momentum. It is shown that the observed autocorrelation of the mountain torque and its crosscorrelations with the global angular momentum are captured quite well by the linear model. This suggests that the observed global mountain torque mainly reflects the linear motion of planetary wave modes over topography. The impact of the mountains on the waves is of minor importance in this context.
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