Convectively generated internal gravity waves in the lower atmosphere of Venus. I. No wind shear.

Details Convectively generated internal gravity waves in the lower atmosphere of Venus. I. No wind shear. Convectively generated internal gravity waves in the lower atmosphere of Venus. I. No wind shear.

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jats...57..184b&link_type=abstract

Journal of Atmospheric Science, Vol. 57, No. 2, p. 184 - 199

Computer Science

5

Venus Atmosphere: Convection, Venus Atmosphere: Gravity Waves, Venus Atmosphere: Winds

Scientific paper

The authors investigate internal gravity wave generation by convection in the lower atmosphere of Venus. A two-dimensional, nonlinear, fully compressible model of a perfect gas is employed. The calculations consider the lower atmosphere from 12- to 60-km altitude, thereby including two convection regions: the lower atmosphere convection layer from roughly 18- to 30-km altitude and the cloud-level convection layer from roughly 48- to 55-km altitude. The gravity waves of interest are located in the stable layer between these two convection regions. This study considers gravity wave generation and propagation in the absence of mean wind shear. In the absence of mean wind shear, internal gravity waves are primarily generated by cloud-level convection. Horizontal wavelengths (≡10-15 km) are similar to dominant horizontal scales in the cloud-level penetrative region, and intrinsic horizontal phase speeds are comparable to cloud-level downdraft velocities. Without mean wind shear, there is no effective coupling between the lower atmosphere below 34-km altitude and the overlying stable layer. Simulated wave amplitudes and vertical wavelengths agree well with spacecraft observations, suggesting that gravity waves generated by cloud-level convection through the "mechanical oscillator" effect may be responsible for observed variations in the stable layer.

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