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Dowload Poster (US letter size, ps)
Migrating and nonmigrating temperature tides
from January 11, 1993 TIME-GCM histories
with realistic solar, geomagnetic, and NCEP
forcing are sampled along the SABER measurement
track from January 11, 2002. The sampled
model results provide estimates of how SABER
(Sounding the Atmosphere using Broadband
Emission Radiometry) is sampling realistic
tidal fields and how incompletely sampled
tidal modes can alias into equilibrium (=background)
temperature fields derived from the real
data. Sampling full model results along satellite
measurement tracks has been proven a very
useful tool for comparative satellite/model
analyses [e.g. Hagan et al., 2002; Oberheide et al., 2002].
The simulations show a significant aliasing
of nonmigrating diurnal and semi-diurnal
tidal modes into the observed zonal wavenumber
1 patterns. Daily means of zonally averaged
temperatures deviate from the equilibrium
temperature by about 10 Kelvin. These topics
are of particular interest for later comparisons
of the satellite observations with models,
climatologies, and ground-based observations.
The SABER constituent data should also exhibit tidal signatures associated with the vertical motions of the tides. A first guess of the vertical tidal motion is presented by converting the sampled tidal temperature fields to equivalent vertical displacements, assuming the tidal motions are adiabatic. Displacements of ~2 km from the equilibrium height result from the sampled TIME-GCM tides.
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