Stability of jets on Jupiter and Saturn

Details Stability of jets on Jupiter and Saturn Stability of jets on Jupiter and Saturn

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..167..212g&link_type=abstract

Icarus, Volume 167, Issue 1, p. 212-219.

Physics

4

Jupiter, Saturn, Atmospheres, Outer Planet Atmospheres, Atmospheric Dynamics

Scientific paper

The linear stability of a zonal jet that decays with depth is investigated under the assumption that the thermal stratification is very small. A westerly cosine jet is found to be more stable than it is in a thin fluid shell with two-dimensional flow. This is in agreement with observations of Jupiter and Saturn, where jet curvature exceeds the barotropic stability criterion. This result constitutes an alternative hypothesis to that of Ingersoll and Pollard [Icarus 52 (1982) 62], who showed that deep jets extending through the interior are also more stable than thin shell jets. The flow regime assumed in the present work requires that a small stratification can exist and persist even in the presence of horizontal temperature gradients. Further work will be needed to test whether this is realistic.

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