Seasonal variations of semidiurnal tidal-period perturbations in mesopause region temperature, zonal and meridional winds above Fort Collins, CO (40.6°N, 105.1°W)

Details Seasonal variations of semidiurnal tidal-period perturbations in mesopause region temperature, zonal and meridional winds above Fort Collins, CO (40.6°N, 105.1°W) Seasonal variations of semidiurnal tidal-period perturbations in mesopause region temperature, zonal and meridional winds above Fort Collins, CO (40.6°N, 105.1°W)

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0292y&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0292

Physics

3309 Climatology (1616, 1620, 3305, 4215, 8408), 3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3360 Remote Sensing, 3389 Tides And Planetary Waves

Scientific paper

Based on Colorado State University (CSU) Na lidar observations over full diurnal cycles from May 2002 to April 2006, harmonic analysis was performed to extract semidiurnal perturbations in mesopause region temperature, zonal and meridional winds over Fort Collins, CO (40.6°N, 105.1°W). The observed monthly semidiurnal amplitudes and phases are compared to predictions of the Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA) for the CSU Na lidar location. Both show similar tidal seasonal variations: a) propagating mode dominance in winter and equinoctial months and evanescent mode behavior in summer months; b) large amplitude during the winter months with a larger growth rate above ~ 85 km and minimum amplitudes during the summer months around a constant value. The lidar observed a considerable tidal amplitude enhancement in September, a phenomenon previously reported at high latitudes. By calculating the vertical wavenumber squared, m2, of the major semidiurnal modes, (2, 2), (2, 3), and (2, 4), we evaluated the effect of mean temperature and zonal wind on semidiurnal tidal behavior. Considering the amplitude ratio, RP/E, between a propagating mode and the evanescent (2, 2) mode with different amplitude growth rates, and the seasonal dependence of thermal excitation of the major semidiurnal tidal modes in the troposphere and stratosphere, a simplified explanation of the upward propagation of major tidal modes is provided to explain qualitatively the seasonal and altitude variation of semidiurnal tidal amplitudes and phases.

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