Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgrd..11221105z&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue D21, CiteID D21105
Physics
4
Atmospheric Processes: Mesospheric Dynamics, Atmospheric Processes: Thermospheric Dynamics (0358), Atmospheric Processes: Tides And Planetary Waves
Scientific paper
Satellite observations of monthly (i.e., 60-d averages centered on the 15th of each month) zonal mean and migrating tide winds in the region of 90-120 km and 40°S-40°N from the Wind Imaging Interferometer are presented. The zonal mean zonal winds are characterized by annually varying eastward winds at midlatitudes with a maximum in summer and semiannually varying westward winds in the tropics with maxima at equinox below 105 km. The zonal mean meridional winds are characterized by a summer-to-winter flow below 100 km at solstice and by a cell-like structure at equinox; the latter is the first such global observation of this tidally driven structure. Two distinct types of diurnal tide are observed: an upward propagating one and an evanescent one of comparable magnitude. The propagating tide, which is dominant in the subtropics below about 105 km, exhibits a semiannual variation with a primary maximum in March/April and a secondary maximum in September/October. The evanescent tide, which is dominant poleward of 20°N/S and above 100 km, has an annual variation with a maximum in the summer months. The coupling of the two produces a double-peaked structure in the vertical profile of the diurnal amplitude. The semidiurnal tide is generally weaker than the diurnal tide. The maximum semidiurnal winds are at 30-40°N/S and at 105-110 km. Both zonal and meridional components are stronger in April-September than in October-March in both hemispheres, but in the equatorial region in April-September the meridional component has a maximum whereas the zonal component has a minimum.
McLandress Charles
Shepherd Gordon G.
Zhang Shengpan P.
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