Diurnal Nonmigrating Tides From TIDI Wind Measurements: Monthly Climatologies

Details Diurnal Nonmigrating Tides From TIDI Wind Measurements: Monthly Climatologies Diurnal Nonmigrating Tides From TIDI Wind Measurements: Monthly Climatologies

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa43a1082o&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA43A-1082

Physics

3332 Mesospheric Dynamics, 3389 Tides And Planetary Waves

Scientific paper

We report on diurnal nonmigrating tides determined from TIMED Doppler Interferometer (TIDI) measurements of zonal and meridional winds in the mesosphere/lower thermosphere. We overview climatologies of monthly mean amplitudes and phases for seven tidal components (i.e., westward propagating wavenumbers 2, 3, and 4; the standing diurnal tide; and eastward propagating wavenumbers 1, 2, and 3) at altitudes between 85 and 105 km and latitudes between 45S and 45N. The observed seasonal variations agree well with 1991-1994 UARS results at 95 km. Comparisons between the TIDI results and global scale wave model (GSWM) and thermosphere-ionosphere-mesosphere-electrodynamcis general circulation model (TIME-GCM) tidal predictions indicate that the large eastward propagating wavenumber 3 amplitude is driven by tropical tropospheric latent heat release alone. In contrast, latent heating and planetary wave/migrating tidal interactions are equally important to westward 2 and standing diurnal tidal forcing. There is good quantitative agreement between TIDI and the model predictions during equinox, but they tend to underestimate the westward 2 and standing diurnal tide during solstice. Neither model reproduces the observed seasonal variations of the eastward propagating components.

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