Interaction of moist convection with zonal jets on Jupiter and Saturn |
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Authors: | Liming Li Andrew P Ingersoll |
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Institution: | a Division of Geological and Planetary Sciences, MS 150-21, California Institute of Technology, Pasadena, CA 91125, USA b Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ 08544-0710, USA |
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Abstract: | Observations suggest that moist convection plays an important role in the large-scale dynamics of Jupiter's and Saturn's atmospheres. Here we use a reduced-gravity quasigeostrophic model, with a parameterization of moist convection that is based on observations, to study the interaction between moist convection and zonal jets on Jupiter and Saturn. Stable jets with approximately the same width and strength as observations are generated in the model. The observed zonal jets violate the barotropic stability criterion but the modeled jets do so only if the flow in the deep underlying layer is westward. The model results suggest that a length scale and a velocity scale associated with moist convection control the width and strength of the jets. The length scale and velocity scale offer a possible explanation of why the jets of Saturn are stronger and wider than those of Jupiter. |
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Keywords: | Jupiter atmosphere Saturn atmosphere Atmospheres dynamics |
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