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Title:
The abundance and distribution of water vapor in the Jovian troposphere as inferred from Voyager IRIS observations
Authors:
Carlson, Barbara E.; Lacis, Andrew A.; Rossow, William B.
Affiliation:
AA(NASA, Goddard Institute for Space Studies, New York), AB(NASA, Goddard Institute for Space Studies, New York), AC(NASA, Goddard Institute for Space Studies, New York)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, April 1, 1992, p. 648-668. (ApJ Homepage)
Publication Date:
04/1992
Category:
Lunar and Planetary Exploration
Origin:
STI
NASA/STI Keywords:
Infrared Astronomy, Jupiter Atmosphere, Spaceborne Astronomy, Troposphere, Water Vapor, Cloud Cover, Iris Satellites, Radiative Transfer, Voyager Project
DOI:
10.1086/171182
Bibliographic Code:
1992ApJ...388..648C

Abstract

The Voyager IRIS spectra of the Jovian North Equatorial Belt (NEB) hot spots are reanalyzed using a radiative transfer model which includes the full effects of anisotropic multiple scattering by clouds. The atmospheric model includes the three thermochemically predicted cloud layers, NH3, NH4SH, and H2O. Spectrally dependent cloud extinction is modeled using Mie theory and the refractive indices of NH3 ice, NH4SH ice, water, and H2O ice. The upper tropospheric temperature profile, gas abundances, height-dependent parahydrogen profile, and vertical distribution of NH3 cloud opacity are retrieved from an analysis of the far-infrared (180-1200/cm) IRIS observations. With these properties constrained, the 5-micron (1800-2300/cm) observations are analyzed to determine the atmospheric and cloud structure of the deeper atmosphere (P of greater than 1.5 bars). The results show that the abundance of water is at least 1.5 times solar with 2 times solar (0.00276 mixing ratio relative to H2) providing the best-fit to the Voyager IRIS hot spot observations.

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