Vapor pressure isotope fractionation effects in planetary atmospheres: application to deuterium

Details Vapor pressure isotope fractionation effects in planetary atmospheres: application to deuterium Vapor pressure isotope fractionation effects in planetary atmospheres: application to deuterium

1999-11-15

arxiv.org/abs/astro-ph/9911255v1

Astronomy and Astrophysics

Astrophysics

24 pages, 1 table, 6 figures. Paper accepted for publication in ICARUS

Scientific paper

10.1006/icar.1999.6264

The impact of the vapor pressure difference between deuterated and nondeuterated condensing molecules in planetary atmospheres is quantitatively assessed. This difference results in a loss of deuterium in the vapor phase above the condensation level. In Titan, Uranus and Neptune, the effect on CH3D is too subtle to alter current D/H ratio determinations. In Mars, the effect can induce a large depletion of HDO, starting about one scale height above the condensation level. Although the current infrared measurements of the D/H ratio appear to be almost unaffected, the intensity of disk-averaged millimetric HDO lines can be modified by about 10%. The effect is much stronger in limb sounding, and can be easily detected from orbiter observations.

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