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S.G. Edgington, R.A. West, A.J. Friedson (JPL), S.K. Atreya (U.Michigan)
We present a coupled photochemical/meridional transport model of Jupiter's upper troposphere and lower stratosphere. This model includes the chemistry resulting from the photolysis of ammonia, phosphine, and a subset of hydrocarbon compounds. Transport of chemical species is modeled using the method of Toon et al. ( J.Atmos.Sci., 45, 2123-2143, 1988) for tracer transport and used by Friedson et al. (Icarus, 138, 141-156, 1999) to model the migration of dust in the months after the impact of Comet Shoemaker-Levy 9 with Jupiter. Transport of chemical tracers is driven by the meridional circulation derived by West, et al. ( Icarus, 100, 245-259, 1992) and eddy mixing ( c.f. Friedson, et al., 1999). Test cases will be shown to illustrate the relative importance of each process on the abundance and movement of chemical species. In particular, we will be interested in the effect of meridional winds and latitudinal temperature variations on the abundances of various molecules. We will also look at the relative importance of eddy transport in the meridional direction versus eddy transport in the vertical. We compare the results of this model to globally-averaged and localized photochemical models in which the transport is modeled solely by molecular and vertical eddy mixing (c.f. Edgington, et al., Icarus, 142, 342-356, 1999). A comparison of this model with recent spectal observations of ammonia and phosphine (e.g. Lara, et al., Icarus, 131, 317-333, 1998; Edgington, et al., 1999) and ultraviolet images (Vincent, et al., Icarus, 143, 189-205, 2000) is presented.
This research has been supported by the National Research Council Resident Research Associate program.
The author(s) of this abstract have provided an email address for comments about the abstract: Scott.G.Edgington