Stratospheric profile of HCN on Titan from millimeter observations

Details Stratospheric profile of HCN on Titan from millimeter observations Stratospheric profile of HCN on Titan from millimeter observations

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...85...43t&link_type=abstract

Icarus (ISSN 0019-1035), vol. 85, May 1990, p. 43-57. Research supported by INSU.

Computer Science

43

Atmospheric Composition, Hydrocyanic Acid, Satellite Atmospheres, Stratosphere, Titan, Abundance, Error Analysis, Least Squares Method, Millimeter Waves, Spectrum Analysis, Vertical Distribution, Voyager Project, Saturn, Satellites, Titan, Stratosphere, Hydrogen Cyanide, Atmosphere, Spectra, Distribution, Concentration, Statistical Analysis, Altitude, Mining, Abundance, Comparisons, Spacecraft Observations, Analysis, Voyager 1 Mission, Iris Instrument, Earth-Based Observations, Procedure, Radiative Transfer

Scientific paper

Synthetic spectra are presently fitted to observations of HCN's (1-0) line at 88.6 GHz on Titan, in order to derive the compound's stratospheric vertical distribution. An increase in HCN with altitude is noted, and a mean mixing ratio scale height of 47 (+36, -11) km is derived for the 100-300 km altitude region. The results obtained are in keeping with recent Voyager IR measurements, although the vertical concentration gradient observed is much steeper, and the lower-stratosphere abundance smaller, than predicted by extant photochemical models; it is suggested that theoretical HCN profiles may be harmonized with these results by reducing the magnitude assumed for stratospheric vertical-eddy mixing.

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