Infrared absorption by shape distributions of NH3 ice particles - an application to the Jovian atmosphere

Statistics – Computation

Scientific paper

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Ammonia, Ice, Infrared Absorption, Jupiter Atmosphere, Shapes, Solidified Gases, Albedo, Particle Size Distribution, Troposphere

Scientific paper

How the distribution of small NH3 ice particles over shapes affects the strength of resonant absorption features at 9.4 and 26 microns is examined. The T-matrix method is employed to compute optical cross sections for shape distributions of 0.5 and 1 micron volume-equivalent radius spheroids in random orientation. It is shown that the maximum of the resonant absorption for the shape distributions is 1.5-2 times smaller than that for equal-volume spherical particles, the absorption peek being shifted toward longer wavelengths. Computation results support the conclusion of West et al. (1989) that, apparently, small NH3 ice particles cannot be the principal component of the Jovian troposphere in the 300 to 500 mbar area.

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