Wednesday, 12 January 2000
This poster presents a method for determining the
structure of the migrating diurnal and semi-diurnal tides,
the zonal mean state, and the damping of the tides due to
gravity wave drag and diffusion within the mesosphere and
lower thermosphere. This novel approach forgoes the
usual local time spectral analysis of each field variable.
Instead, the horizontal wind and temperature fields are used
simultaneously to obtain an estimate of tidal and mean state
components of these fields on a daily basis. This is
accomplished by means of a data assimilation technique that
incorporates a tide and mean state model. A new tidal model
based on the method of multiple scales was developed for
this purpose. The details of this model and the
assimilation technique are described. This techniques has
been applied to the daily measurements of winds and
temperatures by the High Resolution Doppler Imager on UARS
and some results concerning the structure of the mean winds
and temperatures and the structure and variability of the
tides will be shown.
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