Tropospheric gas composition and cloud structure of the Jovian north equatorial belt

作者: Barbara E. Carlson , Andrew A. Lacis , William B. Rossow

DOI: 10.1029/92JE02737

关键词:

摘要: High spatial resolution Voyager infrared interferometer spectrometer spectra of the North Equatorial Belt (NEB) reveal longitudinal variability 5-μm brightness temperatures order 100°C. These observations are used to investigate variations in gas composition and cloud structure NEB. We use an anisotropic multiple scattering radiative transfer model calculate synthetic for comparison with IRIS observations. The spectral dependence extinction from 180 2300 cm−1 is modeled using Mie theory. entire range (180–2300 cm−1) constrain properties vertical Within model, base locations vary assumed abundances according thermochemical equilibrium. find that abundance profiles condensible species, para hydrogen optical depths can be as tracers local large-scale dynamics. Based on NH3 required fit observations, we conclude bulk provided by large particles, effective radii ≈100 μm; however, a small particle mode may also present. observed temperature reproduced opacity water relative humidity. NEB hot spots, due their low opacity, provide unique opportunity study deep Jovian atmosphere. Cloud at P > 4 bars (coincident location thermochemically predicted H2O cloud) reproduce continuum level near 2130 cm−1, well overall shape between 2100 cm−1. Water humidity found spatially above increasing ≈15% spots 100% colder ensembles. variation strongly correlated suggesting dynamic depletion vapor forming most plausible explain profile within

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