Momentum transport by the thermal tide in the stratosphere of Venus

Details Momentum transport by the thermal tide in the stratosphere of Venus Momentum transport by the thermal tide in the stratosphere of Venus

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975qjrms.101..763p&link_type=abstract

Royal Meteorological Society, Quarterly Journal, vol. 101, Oct. 1975, p. 763-776.

Mathematics

Logic

6

Atmospheric Tides, Momentum Transfer, Stratified Flow, Venus Atmosphere, Atmospheric Models, Atmospheric Stratification, Boussinesq Approximation, Differential Equations, Stratosphere, Wentzel-Kramer-Brillouin Method

Scientific paper

The response of a stratified Boussinesq fluid subjected to a moving periodic thermal forcing is analysed, and the role of thermal stratification in the generation of a mean zonal motion is discussed. In the parameter range where the phase speed of this forcing is much less than the speed of the gravest gravity wave mode, the problem may be treated as one of momentum transport by damped internal gravity waves. Results from a simple model show that mean flow speeds much larger than the speed of heat source motion can be generated by this mechanism. It is argued that mean winds of the order of 100 m/sec may be generated, thus supporting the suggestion of Schubert and Whitehead that this mechanism is responsible for the observed four-day rotation of that planet's equatorial stratosphere. It is shown that the ratio of mean wind velocity to the speed of the subsolar point is independent of the length of the solar day, and that it is largely determined by the distribution of radiative heating and cooling in the planetary atmosphere.

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