The rigid shell component for superrotation in planetary atmospheres: Angular momentum budget, mechanical analog and simulation of the spin up process

Details The rigid shell component for superrotation in planetary atmospheres: Angular momentum budget, mechanical analog and simulation of the spin up process The rigid shell component for superrotation in planetary atmospheres: Angular momentum budget, mechanical analog and simulation of the spin up process

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aaspsmeetr....m&link_type=abstract

Presented at the 12th Ann. Meeting of the Div. for Planetary Sci. of the Am. Astron. Soc., Tucson, Ariz., Oct. 1980

Astronomy and Astrophysics

Astronomy

Angular Momentum, Laplace Transformation, Planetary Atmospheres, Planetary Boundary Layer, Planetary Mass, Planets, Superrotation, Classical Mechanics, Geostrophic Wind, Heat Transfer, Shear Properties, Viscosity

Scientific paper

An analysis of superrotation in the atmosphere of planets, with rotation axis perpendicular to the orbital plane is presented. As the atmosphere expands, Hadley cells develop producing a redistribution of mass and angular momentum. A three dimensional thermally driven zonally symmetric spectral model and Laplace transformation simulate the time evolution of a fluid leading from corotation under globally uniform heating to superrotation under globally nonuniform heating. For high viscosities the rigid shell component of atmospheric superrotation can be understood in analogy with a pirouette. During spin up angular momentum is transferred to the planet. For low iscosities, the process is reversed. A tendency toward geostrophy, combined with increase of surface pressure toward the poles (due to meridional mass transport), induces the atmosphere to subrotate temporarily at lower altitudes. Resultant viscous shear near the surface permits angular momentum to flow from the planet into the atmosphere propagating upwards to produce high altitude superrotation rates.

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