Water vapor in the lower atmosphere of Venus: a new analysis of optical spectra measured by entry probes.

Computer Science – Databases

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Venus Atmosphere: Water Vapor

Scientific paper

The authors reanalyze Venera 11, 13, and 14 data using recently available spectroscopic databases with the line-by-line procedure to calculate gaseous opacity and a discrete ordinates radiative transfer program to generate monochromatic intensity spectra. Contrary to the previous interpretation of the same data, mixing ratio was found to be nearly constant and equal to 30±10 ppm in the altitude range of 5 - 60 km. It seems likely that H2O mixing ratio is varying slightly from 40 ppm in the clouds down to the minimum of 20 ppm at 10 - 20 km, although another possibility of constant 30 ppm profile also cannot be rejected. Both models are in good agreement with Earth-based observations within experimental errors of both datasets.

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