Investigation of observed day-to-day variability in September mesopause region tidal-period perturbations

Details Investigation of observed day-to-day variability in September mesopause region tidal-period perturbations Investigation of observed day-to-day variability in September mesopause region tidal-period perturbations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa41a1049l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA41A-1049

Physics

3334 Middle Atmosphere Dynamics (0341, 0342), 3360 Remote Sensing, 3384 Waves And Tides

Scientific paper

Simultaneous observations of the tidal-period perturbations (diurnal, semidiurnal, .etc) of temperature, zonal wind, and meridional wind in the mesopause region (80km-105km) by the CSU two-beam Na lidar system in Fort Collins, Colorado between UT day 264 and 272, September 2003 (a 9-day continuous campaign) indicate a dramatic day-to-day variability on tidal amplitudes. Further analysis on the dataset with best fit to tidal perturbations within a running 24hr window reveals that in addition to diurnal and semidiurnal tides, there exist 3-day and 5-day waves. We also observed a 2-fold increase in amplitudes of temperature, zonal and meridional wind tides on the day 267-268. Whether this is the result of tidal-gravity wave nonlinear interaction, or of planetary wave modulation is the main objective of this paper. Time series of the temperature vertical profiles for day 267 shows a strong temperature inversion with a near adiabatic lapse rate above. We find that at the altitude near adiabatic lapse rate, the semidiurnal and diurnal tides are in-phase so that the total negative temperature gradient due to tidal contribution was increased to near adiabatic lapse rate. The observed temperature inversion and accompanying change in zonal wind are consistent with wave breaking. Analysis in this direction invoking both TIME-GCM simulation and TIMED/SABER observed temperatures providing a global perspective will be made.

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