Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa54a..03v&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA54A-03
Physics
0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 0342 Middle Atmosphere: Energy Deposition (3334), 3332 Mesospheric Dynamics, 3384 Acoustic-Gravity Waves
Scientific paper
We study heating and cooling in the upper mesosphere due to dissipation of gravity waves as described by eddy turbulence, eddy conductivity, and chemical heating and cooling. We estimate the role of these processes in seasonal variations of the temperature in the upper mesosphere and in the production of the double mesopause. Also, we model the impact of these processes on atomic oxygen density in conjunction with published experimental data. An additional temperature maximum in the upper mesosphere (the 'double mesopause') can be produced due to heating by eddy turbulence. According to our model, there is a close connection between the temperature peak in the mesosphere and the O density distribution. A rocket experiment confirms this connection. Applying our model to the case, a breaking gravity wave observed during the rocket campaign gives excellent agreement with both the temperature and oxygen profiles observed. The splitting of the O density profiles can occur in fall and spring seasons when the double mesopause is observed.
Kelley Michael C.
Vlasov M.
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