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A 3D Convective Model for the Jovian Wind BandsIn an earlier paper, we proposed that Jupiter's alternating wind bands are a manifestation of the global interaction between rotation and convection in a shallow layer. The model, however, was obtained from linearization of the 2D equations of motions. At HKUST/Hong Kong, we are now trying to study this problem by rigorous numerical simulation. Using a three-dimensional spectral numerical code, we compute models for the outermost layer of Jupiter's convective envelope. Two cases have been studied. In one the atmospheric pressure varies from 1 to 23 bar, and in the other from 1 to 115 bar. The physical parameters (internal energy flux, rotation rate) are chosen to be close to those expected, but solar heating, chemistry, as well as dynamical influences from deeper layers are ignored. The models generate wind field patterns that contain alternating jet streams with resemblance to the Jovian bands. Instantaneous values of the mean zonal flow at the equator reach 80 m/sec. Yet the mean meridional flows are less than 1% of such value. The meridional temperature profile at the cloud top level also shows a double hump structure of a few degrees (as observed) in the subtropics. Though there is not complete quantitative agreement (caused perhaps by neglected effects like solar radiation), these models demonstrate, in principle, the feasibility of generating a Jovian type wind pattern through the interaction of fast rotation and convection in a thin shell.
Document ID
20040171249
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Mayr, H. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chan, K. L.
(Hong Kong Univ. of Science and Technology Hong Kong)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Lunar And Planetary Science And Exploration
Meeting Information
Meeting: 38th Meeting of the American Astronomical Society Division of Planetary Science
Location: Louisville, KY
Country: United States
Start Date: November 8, 2004
End Date: November 12, 2004
Sponsors: American Astronomical Society
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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