Abstract
The Doppler spread parameterization is used to represent the effects of a background spectrum of non-orographic gravity waves in the Canadian Middle Atmosphere Model. Two versions of the Doppler spread parameterization are used, differing only in the range of the vertical wave number part of the input spectrum. Results from seasonal simulations made with combinations of Doppler spread and orographic gravity wave drag parameterizations are discussed and compared with those made with the basic version of the model which contains an orographic gravity wave drag parameterization but no explicit parameterization for non-orographic waves. Results obtained indicate that the Doppler spread parameterization brings about a number of improvements in simulations of the zonal mean structure of the middle atmosphere including closing of the mesospheric jets and reversal of the mean zonal winds above the mesopause in middle and high latitudes.
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