Retrieval of ammonia abundances and cloud opacities on Jupiter from Voyager IRIS spectra

Statistics – Computation

Scientific paper

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Abundance, Ammonia, Cloud Cover, Data Retrieval, Jupiter Atmosphere, Opacity, Atmospheric Composition, Atmospheric Models, Iris Satellites, Radiative Transfer, Voyager Project

Scientific paper

A method is formulated to retrieve gaseous ammonia abundance and cloud opacities at 45 and 5 μm from Voyager IRIS data using a simplified atmospheric model and a two-stream radiative transfer approximation. The goal is to obtain sufficient computational efficiency to permit global mapping of the relative horizontal variations of these parameters. It is found that the cloud particles can be treated as pure absorbers at 45 μm, but scattering must be included at 5 μm where a single scattering albedo of ≡0.75 is inferred. These results are used to develop a simple algorithm for the retrieval of ammonia abundance and cloud optical depths at 45 and 5 μm from measurements at 216, 225, and 2050 cm-1.

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