Temperature tides and waves near the mesopause from lidar observations at two latitudes

Details Temperature tides and waves near the mesopause from lidar observations at two latitudes Temperature tides and waves near the mesopause from lidar observations at two latitudes

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgrd..11019103f&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue D19, CiteID D19103

Physics

10

Atmospheric Processes: Tides And Planetary Waves, Atmospheric Composition And Structure: Pressure, Density, And Temperature, Atmospheric Processes: Mesospheric Dynamics, Atmospheric Processes: Remote Sensing

Scientific paper

Daytime and nighttime temperature measurements covering several days enable the detection of tidal and wave perturbations in the mesopause region. This study presents two potassium lidar observations from 28°N and 54°N which cover more than 100 hours each. The temperature variations during this time show significant wave features, and numerical analyses allow to separate those of tidal and nontidal origin. The tidal activity under winter conditions is found to be dominated by upward propagating semidiurnal tides with amplitudes of about 10 K. Whereas a diurnal tide was also seen at 54°N, it was not detectable at 28°N. The data are discussed with respect to various available data sets and models. Comparisons with current numerical models show that especially the semidiurnal tide is clearly underestimated at both latitudes. The tidal activity exhibits a strong variability. This indicates nonlinear interactions with planetary waves, which have also been observed.

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