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Baroclinic Instabilities in Jupiter's Zonal Flow

Gierasch, Peter J. and Ingersoll, Andrew P. and Pollard, David (1979) Baroclinic Instabilities in Jupiter's Zonal Flow. Icarus, 40 (2). pp. 205-212. ISSN 0019-1035. doi:10.1016/0019-1035(79)90067-8.

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The baroclinic stability of Jupiter's zonal flow is investigated using a model consisting of two continuously stratified fluid layers. The upper layer, containing a zonal shear flow and representing the Jovian cloudy regions above p ∼ 5 bars, is the same as Eady's (1949) model for the Earth. The lower layer has a relatively large but finite depth with a quiescent basic state, representing the deep Jovian fluid bulk below p ∼ 5 bars. Due to the presence of the lower layer, the linearized non-dimensional growth rates are drastically reduced from the O(1) growth rates of the original Early model. Only very long wavelengths relative to the upper fluid's radius of deformation L_1 are unstable. Eddy transports of heat are also reduced relative to estimates based on scaling arguments alone. Since the hydrostatic approximation for the lower-layer perturbation breaks down at great depths, a second model is presented in which energy propagates downward in an infinitely deep lower fluid obeying the full linearized fluid equations. In this model, the growth rates are again very small, but now all wavelengths are unstable with maximum growth rates occurring for wavelengths O(1) relative to L_1. These results illustrate the importance for the upper-layer meteorology of the interface boundary condition with the lower fluid, which is radically different from the rigid lower boundary of the Earth's troposphere.

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Ingersoll, Andrew P.0000-0002-2035-9198
Additional Information:© 1979 Academic Press, Inc. Received October 20, 1978; revised July 2, 1979. This work was supported in part by NASA Grant NGL 05-002-003 to the California Institute of Technology and by Grant NGL 33-010-186 from the NASA Planetary Atmospheres Program to Cornell University. P.J.G. acknowledges the support of an Alfred P. Sloan research fellowship. This paper is Contribution Number 3112 of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, 91125.
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NASANGL 05-002-003
NASANGL 33-010-186
Alfred P. Sloan FoundationUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences3112
Issue or Number:2
Record Number:CaltechAUTHORS:20121205-102420134
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Official Citation:Peter J. Gierasch, Andrew P. Ingersoll, David Pollard, Baroclinic instabilities in Jupiter's zonal flow, Icarus, Volume 40, Issue 2, November 1979, Pages 205-212, ISSN 0019-1035, 10.1016/0019-1035(79)90067-8. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35816
Deposited On:05 Dec 2012 18:42
Last Modified:09 Nov 2021 23:17

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