Evidence for the depletion of ammonia in the Uranus atmosphere

Details Evidence for the depletion of ammonia in the Uranus atmosphere Evidence for the depletion of ammonia in the Uranus atmosphere

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...34...10g&link_type=abstract

Icarus, vol. 34, Apr. 1978, p. 10-19.

Computer Science

22

Ammonia, Atmospheric Composition, Microwave Spectra, Planetary Atmospheres, Uranus (Planet), Abundance, Atmospheric Models, Atmospheric Radiation, Brightness Temperature, Vapor Pressure

Scientific paper

The theoretical disk brightness temperature spectra for Uranus are computed and compared with the observed microwave spectrum. It is shown that the emission observed at short centimeter wavelengths originates deep below the region where ammonia would ordinarily begin to condense. We demonstrate that this result is inconsistent with a wide range of atmospheric models in which the partial pressure of NH3 is given by the vapor-pressure equation in the upper atmosphere. It is estimated that the ammonia mixing ratio must be less than 10 to the minus 6 in the 150 to 200 K temperature range. This is two orders of magnitude less than the expected mixing ratio based on solar abundances. The evidence for this depletion and a possible explanation are discussed.

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