Meridional Transport in the Stratosphere of Jupiter

Details Meridional Transport in the Stratosphere of Jupiter Meridional Transport in the Stratosphere of Jupiter

2005-12-02

arxiv.org/abs/astro-ph/0512068v1

Astrophys.J.635:L177-L180,2005

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figures, 1 table. ApJL in press

Scientific paper

10.1086/499624

The Cassini measurements of C$_2$H$_2$ and C$_2$H$_6$ at $\sim$5 mbar provide a constraint on meridional transport in the stratosphere of Jupiter. We performed a two-dimensional photochemical calculation coupled with mass transport due to vertical and meridional mixing. The modeled profile of C$_2$H$_2$ at latitudes less than 70$^\circ$ follows the latitude dependence of the solar insolation, while that of C$_2$H$_6$ shows little latitude dependence, consistent with the measurements. In general, our model study suggests that the meridional transport timescale above 5-10 mbar altitude level is $\gtrsim$1000 years and the time could be as short as 10 years below 10 mbar level, in order to fit the Cassini measurements. The derived meridional transport timescale above the 5 mbar level is a hundred times longer than that obtained from the spreading of gas-phase molecules deposited after the impact of Shoemaker-Levy 9 comet. There is no explanation at this time for this discrepancy.

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