Models of the ISO 3-μm Reflection Spectrum of Jupiter

Details Models of the ISO 3-μm Reflection Spectrum of Jupiter Models of the ISO 3-μm Reflection Spectrum of Jupiter

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..136....1b&link_type=abstract

Icarus, Volume 136, Issue 1, pp. 1-13.

Computer Science

28

Scientific paper

A spectrum of Jupiter in the 3-μm region obtained with the Infrared Space Observatory (ISO) shows evidence for the long-sought spectral signature of NH_3 ice particles in the jovian atmosphere. We calculated Jupiter 3-μm reflection spectrum, including multiple scattering by spherical cloud particles. Models containing reflection from two cloud decks along with NH_3 gas absorption reproduce the sharp drop in Jupiter's reflectance longward of 2.7 mum. Inclusion of cloud particles composed of NH_3 ice in the upper cloud near 0.55 bar improves the fit to the spectrum near 3.0 mum, due to the N-H stretch absorption of solid NH_3. For models with a single size for the NH_3 ice, particles with radius a ~ 10 μm give the best fit. For a model with a bimodal distribution of a = 1 μm and a = 10 μm NH_3 ice particles, the large particles need to dominate the 3-μm NH_3 ice particle opacity to provide absorption that is sufficiently broad.

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