T. Sakazaki, M. Fujiwara (presenting), X. Zhang, M. Hagan, and J. Forbes
Diurnal tides from the troposphere to the lower mesosphere as deduced
from TIMED/SABER satellite data and six global reanalysis data sets
We compare and examine diurnal temperature tides including their
migrating component (DW1) from the troposphere to the lower mesosphere,
using data from Thermosphere-Ionosphere-Mesosphere-Energetics and
Dynamics/Sounding of the Atmosphere using Broadband Emission Radiometry
(TIMED/SABER) and from six reanalysis data sets. The horizontal and
vertical structures of the diurnal tides in SABER and reanalyses
reasonably agree, although the amplitudes are up to 30–50% smaller in
the reanalyses than in the SABER in the upper stratosphere to lower
mesosphere. Of all tidal components, the DW1 is dominant while a clear
eastward propagating zonal wave number 3 component (DE3) is observed at
midlatitudes of the Southern Hemisphere in winter. Among the six
reanalyses, MERRA, ERA-Interim and CFSR are better at reproducing
realistic diurnal tides. It is found that the diurnal tides extracted
from SABER data in the winter-hemisphere stratosphere suffer from
sampling issues that are caused by short-term variations of the
background temperature.
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