Gravity waves seem practically certain to be important for several aspects of this picture, beyond their widely accepted role in the summer mesosphere.
2
Recent observational evidence indicates a systematic reduction in gravity wave fluxes in the upper mesosphere and lower thermosphere from solar minimum to solar maximum.
3
That is why the summer polar mesosphere is the coldest place on earth despite also being the sunniest.
4
The main sink route of SF 5 CF 3 from the earth's atmosphere is low-energy electron attachment in the mesosphere.