Physics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996icar..124..598s&link_type=abstract
Icarus, Volume 124, Issue 2, pp. 598-607.
Physics
8
Scientific paper
We investigate the influence of atmospheric dynamics on the isotopic enrichment factor of monodeuterated methane, f(z) = (D_solarH)_CH_4_solar(D_solarH)_H_2, in the outer planets. We explore the influence of dynamics using three classes of models. In the first two, we briefly discuss the simple approaches that have previously been used to account for dynamics in the determination of f(z). We discuss the strengths and limitations of these approximations. Then, we combine the best portions of the first two models to produce a third model that we feel more realistically describes mixing on the outer planets. Using different limiting assumptions about convective vertical velocities inside the outer planets, we place rough upper and lower limits on possible values of the isotopic enrichment factor at a pressure level of 1 bar for each planet. We find that the isotopic enrichment factor in the observable regions of the outer planets is sensitive to the dynamical model and parameters that are assumed, and thus a measured value of f(z) in the upper, observable levels of the atmosphere could constrain the dynamical regime at deeper levels.
Conrath Barney J.
Gautier Daniel
Smith Michael D.
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