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Radiative instability of a cloudy planetary atmosphere. (1973)

Williams, R. T. ; Ingersoll, A. P. ; Gierasch, P. J.

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Publication Date: 2019-06-27

Description: A cloudy planetary atmosphere at rest is shown to be unstable to disturbances of large horizontal scale. The energy source for the instability is the change in radiative heat flux associated with vertical displacement near the emitting level. A simple model is described in which the net heating rate in the cloud is proportional to the vertical displacement of the cloud. The constant of proportionality may be either positive or negative. Disturbances may take the form of either quasi-steady geostrophic motions or amplified inertia-gravity waves. The model is applied to Jupiter's zonal winds and to motions near the Venus cloud tops, and provides a possible explanation for many important features of these two flows.

Keywords: SPACE SCIENCES

Type: Icarus; 19; Aug. 197

Format: text

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