Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0717s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0717
Other
0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 0342 Middle Atmosphere: Energy Deposition, 3332 Mesospheric Dynamics, 3384 Waves And Tides
Scientific paper
Mesospheric tides propagate from below but can be amplified or damped by local physical processes. This paper presents numerical simulations of the tidal interaction with chemical heating in the region 90-100 km. In this region, the bulk of absorbed energy from the sun acts to photolyze molecules and is not converted to heat until the products recombine in exothermic reactions. The location and timing of those reactions are affected by diurnal variations in composition due to photolysis and transport. This chemical heating is maximum at altitudes 90-100 km and is several times stronger at night than during the day. The simulated change in tidal amplitude when this effect is included is largest in subtropical latitudes, where the heating interacts constructively with the temperature perturbations of the upward propagating diurnal tide. The magnitude of the amplification is 10-15%.
Marsh Daniel R.
Smith Anna K.
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