โ Scribed by Michael D. Smith; Barney J. Conrath; Daniel Gautier
No coin nor oath required. For personal study only.
work is to explore the influence of dynamical processes on the determination of the enrichment factor in the observ-We investigate the influence of atmospheric dynamics on the isotopic enrichment factor of monodeuterated methane, f (z) โซุโฌ able layers of the atmospheres of the outer planets. In (D/H) CH 4 /(D/H) H 2 , in the outer planets. We explore the influence particular, we wish to establish the limits imposed by our of dynamics using three classes of models. In the first two, we present knowledge of transport processes in the deep atmobriefly discuss the simple approaches that have previously been spheres of these planets and to show that improved meaused to account for dynamics in the determination of f (z). We surements of the enrichment factor could potentially lead discuss the strengths and limitations of these approximations. to constraints on dynamical parameters.
The isotopic enrichment factor, f, is defined by ets, 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 f ฯญ
D/H) CH 4 (D/H) H 2 , (1) 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 where (D/H) CH 4 ฯญ (1/4)[CH 3 D]/[CH 4 ] is the D/H ratio atmosphere could constrain the dynamical regime at deeper found in methane, and (D/H) H 2 ฯญ (1/2)[HD]/[H 2 ] is the levels.
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