Propagation of Gravity Waves in Saturn Stratosphere and Upper Troposphere

Details Propagation of Gravity Waves in Saturn Stratosphere and Upper Troposphere Propagation of Gravity Waves in Saturn Stratosphere and Upper Troposphere

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4106m&link_type=abstract

American Astronomical Society, DPS meeting #42, #41.06; Bulletin of the American Astronomical Society, Vol. 42, p.1039

Astronomy and Astrophysics

Astronomy

Scientific paper

Atmospheric gravity waves contribute to the overall mixing in a planetary atmosphere impacting the vertical and the horizontal transport of chemical species. They have been studied as a potential source of energy and momentum in the thermosphere of giant planets and are most likely responsible for the observed small-scale layered structure of the lower ionosphere of Jupiter and Saturn.
We focus on the filtering properties of Saturn's middle atmosphere (troposphere and stratosphere) as waves propagate from deep atmospheric layers to higher altitudes. The simulated waves propagate through a realistic atmosphere with temperature and winds varying with hight and latitude in agreement with the Cassini spacecraft visible and infrared observations. Varying background temperature or strong wind variations with hight result in wave reflection and/or ducting preventing waves to reach high altitudes. Waves can encounter critical levels or experience breaking depositing their momentum in the atmosphere accelerating/decelerating the zonal mean flow. We study the thermal and the dynamical forcing that results from the interaction of the waves with the background atmosphere and estimate the spectral properties of the gravity waves that can reach the upper atmosphere.

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