Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa23a1772r&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA23A-1772
Physics
[3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3360] Atmospheric Processes / Remote Sensing, [3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves
Scientific paper
In the upper mesosphere the diurnal tide reaches its maximum amplitude and exhibits variability on a seasonal and interannual time scale. This variability results from the combined effects of source variability and interactions with the background atmosphere. The interaction with the background atmosphere is sometimes idealized in models as an entirely dissipative Rayleigh friction. In this investigation we use satellite data to determine the actual residual terms needed to produce balance in the basic state equations of momentum and thermal energy. Estimates are made for both the migrating (westward propagating zonal wave number 1) tide and also non-migrating tides, although the method does not work for the stationary (zonal wave number 0) tide. Tidal perturbations are determined from two month composites of data from the TIDI and SABER satellite instruments. The residual terms are found to have large components acting in quadrature to the tidal perturbations that may indicate interactions with gravity waves. The time dependence of the residual terms allow us to assess the extent to which they may contribute to tidal variability. The climatology of tidal mean wind interaction is also quantified using two month estimates of the Elliasen-Palm flux made over the time span of the TIMED satellite mission, 2002 to the present.
Lieberman Ruth S.
Ortland David A.
Riggin Dennis M.
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