Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa41a1538w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA41A-1538
Physics
0300 Atmospheric Composition And Structure, 0340 Middle Atmosphere: Composition And Chemistry, 0350 Pressure, Density, And Temperature, 3334 Middle Atmosphere Dynamics (0341, 0342), 3389 Tides And Planetary Waves
Scientific paper
The polar regions in the mesosphere and lower thermosphere are the site of unique tidal features. These tides transport and modify the chemistry of constituents throughout this region. In order to study the transport of the constituents by tidal features in the region, we need to determine the dominant components of the tides and their vertical structures and seasonal variations as the first step. A one-year run of the extended Canadian Middle Atmosphere Model (CMAM) is used to characterize the tidal signatures in this region. Significant amplitudes from wave 0 through wave 4 appear in the model run. The wind and temperature signatures of the dominant components of the diurnal semidiurnal and terdiurnal tides are discussed and their seasonal variations presented. The spatial variations of their superposition are also calculated. Semidiurnal and terdiurnal (as opposed to diurnal) migrating and non-migrating tides dominate in the polar region.
Du Jiulin
Wang Dongming
Ward William E.
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