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Thermal Tides in the Atmosphere of Venus: Comparison of Model Results with Observations

Pechmann, Judith Burt and Ingersoll, Andrew P. (1984) Thermal Tides in the Atmosphere of Venus: Comparison of Model Results with Observations. Journal of the Atmospheric Sciences, 41 (22). pp. 3290-3313. ISSN 0022-4928. doi:10.1175/1520-0469(1984)041<3290:TTITAO>2.0.CO;2.

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A linearized primitive equation (LPE) model is developed to study thermal tides in the atmosphere of Venus. The LPE model describes diurnal and semidiurnal oscillations of a cyclostrophically balanced atmosphere in which zonal velocity varies with altitude and latitude. The numerical algorithm follows Staniforth and Daley. The solar thermal forcing is increased algebraically in time to separate the forced tidal response from free atmospheric oscillations. Parameters of the basic state and forcing agree with Pioneer Venus observations. Results of the model are compared with the solar-fixed component of brightness temperature variations measured by Taylor et al. and Elson using data from the Pioneer Venus orbiter infrared radiometer (OIR). The comparison is made by convolving the computed model radiances with the weighting functions of the OIR channels. Agreement between LPE model results and OIR observations is excellent. Two interesting features of the OIR data are accounted for, namely, the slow variation of phase with altitude and the dominance of the semidiurnal oscillation over the diurnal oscillation. Success of the LPE model opens the way for calculating tidal transports of heat and momentum and assessing the role of tides in maintaining the Venus super-rotation.

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Ingersoll, Andrew P.0000-0002-2035-9198
Additional Information:© 1984 American Meteorological Society. (Manuscript received May 15, 1984, in final form August 27, 1984) We thank Andrew N. Staniforth for sending the program of his primitive equation model, Arthur Raefsky for adapting it to the LPE, Lee S. Elson for providing OIR data and weighting functions, and David Crisp for providing his estimate of the radiative time constant. This research was supported by the Planetary Atmospheres Program of NASA under Grant NAGW-58. Contribution No. 4069 from the Division of Geological and Planetary Sciences, California Institute of Technology.
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Division of Geological and Planetary Sciences Contribution4069
Issue or Number:22
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ID Code:11565
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Deposited On:05 Sep 2008 00:03
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