Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa32b..02g&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA32B-02
Physics
3334 Middle Atmosphere Dynamics (0341, 0342), 3369 Thermospheric Dynamics (0358), 3384 Waves And Tides
Scientific paper
SABER version 1.02 (non-LTE) temperature data is used to document the presence of fast, planetary-scale waves in the mesosphere and lower thermosphere (MLT) for different seasons during 2002. The results show that, at periods τ < 5 days, the planetary-scale wave field is dominated by migrating and non-migrating tides, equatorial Kelvin and inertia-gravity waves, and the 2-day wave. The latter actually appears as the strongest component of an ensemble of normal mode-like oscillations, with maximum amplitude at m=3 and 4 near 2 days. Temperature amplitudes associated with these waves range from a few K for the Kelvin waves and non-migrating tides to about 15 K for the diurnal tide; estimated horizontal velocity amplitudes are in the range 10-50 ms-1. It is also shown by comparison with GCM results that these waves should produce large perturbations in the distribution of chemical species in the MLT.
Garcia Rafael
Lieberman Ruth
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