Wednesday, 24 May 2000
A mesoscale model, with periodic channel boundary conditions, is
used to perform simulations in which gravity waves are imposed
on an atmosphere which is otherwise in approximate
radiative-convective equilibrium. SST is uniform, domain size
is 4500 km by 1200 km, and horizontal resolution 30 km in most
of the simulations. Overall, the waves are damped, consistent
with the concept of "moist convective damping" as in quasi-equilibrium
theory. However, the damping rate is relatively small in some
cases, and in most of the simulations the waves experience episodes
of transient growth superimposed on the decaying trend. Feedbacks
between the wave dynamics and the atmospheric humidity field
appear to be important to certain aspects of the waves' behavior.
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