Tides in the Mesopause Region over Fort Collins, CO (41N, 105W) Based on Lidar Temperature Observations Covering Full Diurnal Cycles

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3332 Mesospheric Dynamics, 3369 Thermospheric Dynamics (0358), 3384 Waves And Tides

Scientific paper

The sodium lidar at Colorado State Univeristy has obtained eighteen sets of 24-hr continuous temperature observations covering a full diurnal cycle distributed throughout the year for 82-102km altitude. These have been analyzed to reveal the seasonal mean amplitude and phase of oscillations with 24, 12, 8,and 6 hour periods. The diurnal and semidiurnal phases typically show clear downward phase propagation, while the ter-dirunal and quad-diurnal components exhibit small amplitudes and disorganized phases as a function of altitude. A comparison of the amplitudes and phases of the diurnal and semidiurnal components with the predictions of the Global-Scale Wave Model showed good general agreement, although better in some seasons than others, suggesting that global-scale migrating tides are the main cause of these oscillations. There is significant variability, however, in the 24 and 12 hr oscillations deduced from the individual 24-hr campaigns within each season. This is most notable in the amplitudes which vary by large factors (amplitudes range from 2K to 20K), even when the corresponding phases are stable to within a few hours, suggesting a modulation of the global migrating tide. This could be caused by time variation in a number of things: the local small-scale wave field, the source stength for global migrating or nonmigrating tide, or changes in the lower atmosphere winds that lead to filtering of any of these waves. It is hoped that future observations that add zonal and meridional wind measurements to the current temperaure measurements with the same durnal and altitude coverage will help clarify the causes of this intra-seasonal variability as well as help resolve the remaining seasonal-average differences between observations and models.

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