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Gravity waves being a major mesospheric forcing that can greatly
impact on the stratospheric circulation, establishing a source
parameterization that is based on our dynamical knowledge of their
generation mechanisms should help in obtaining realistic simulations
of the middle atmosphere. In the MAECHAM4 model, the medium in
which parameterized gravity waves are propagating is surely very
important in determining the broad characteristics of these waves
that reach the middle atmosphere, but this study shows that a
gravity wave source spectrum that is related, even though somewhat
crudely, to dynamical a mechanism leading to gravity wave emission
can actually improve simulations of the middle atmosphere in terms
of zonal mean fields. Convective and jet stream gravity wave excitation
are mechanisms that would also need to be taken into account in
order to get a more complete picture of the impact of modulating
the gravity wave emission by relevant dynamical phenomena in middle
and upper atmospheric general circulation models.