Latitudinal Distribution of Ammonia and Upper Limits of Acetylene and Phosphine in Jupiter's Upper Troposphere and Lower Stratosphere

Details Latitudinal Distribution of Ammonia and Upper Limits of Acetylene and Phosphine in Jupiter's Upper Troposphere and Lower Stratosphere Latitudinal Distribution of Ammonia and Upper Limits of Acetylene and Phosphine in Jupiter's Upper Troposphere and Lower Stratosphere

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2229e&link_type=abstract

American Astronomical Society, DPS meeting #28, #22.29; Bulletin of the American Astronomical Society, Vol. 28, p.1147

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Scientific paper

Observations of the northern and southern hemispheres of Jupiter done with the Hubble Space Telescope Faint Object Spectrograph during May 19-25, 1992 and June 6, 1993 have been analyzed. Spectra at latitudes 6deg N, 15deg N, 20deg N, 25deg N, 48deg N, 65deg N, 12deg S, 25deg S, 33deg S, 48deg S, 65deg S, and the equator were taken along the central meridian. In addition features were observed, including an equatorial plume, the Great Red Spot, and the nearby SEB. The data were taken with the G190H grating, which covers a wavelength range of 180-230 nm, with several combinations of the 0.5" and 1" apertures and the red and blue detectors. A photochemical model combining the hydrocarbon, nitrogen, and phosphorus chemical cycles along with a rigorous multiple scattering radiative transfer model has been used to determine the altitude profiles of ammonia, acetylene, and phosphine as a function of latitude which are consistent with the measured albedos. It is found that up to midlatitudes, the altitude profiles of ammonia are fairly uniform with latitude. Hazes at high latitudes and the equatorial plume obscure molecular species and prevent their detection. Upper limits to the abundances of acetylene and phosphine are provided. Comparison of the Great Red Spot with other regions will also be presented. This analysis also yields constraints on the value of the vertical eddy diffusion coefficient between the ammonia cloud top and the tropopause. Our current best estimate for the value of K is 1.4x10(3) cm(2) s(-1) at 40 km above the 1 bar level and 1.5x10(4) cm(2) s(-1) at 17 km above 1 bar.

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