Temperature Inversion Detected Near The Mesopause Of Venus And Isotopic Composition Measurements With Spicav/soir Results

Details Temperature Inversion Detected Near The Mesopause Of Venus And Isotopic Composition Measurements With Spicav/soir Results Temperature Inversion Detected Near The Mesopause Of Venus And Isotopic Composition Measurements With Spicav/soir Results

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.4502b&link_type=abstract

American Astronomical Society, DPS meeting #39, #45.02; Bulletin of the American Astronomical Society, Vol. 39, p.502

Astronomy and Astrophysics

Astronomy

Scientific paper

The SPICAV/SOIR instrument on board ESA Venus Express orbiter is probing the upper atmosphere of Venus by the technique of solar and stellar occultations. On the night side, occultations of bright UV stars allow to determine the density profile from CO2 absorption in the altitude range 80-140 km and the temperature, from the hydrostatic law. We have detected in many occasions a strong temperature inversion just above the mesopause (at 90-120 km), that we interpret as the result of adiabatice heating during air subsidence, in the day-side to nightside upper atmosphere circulation. The temperature excess is 30-70 K at 100 km.
Water isotopes H2O and HDO were measured by solar occultations with the new IR high resolution (0.15 cm-1) spectrometer SOIR, up to 110 and 95 km. HDO is substantial at highest probed altitudes and should provide D atoms to the upper atmosphere for eventual further escape. A new absorption signature near 2982 cm-1 was discovered, identified now with a previously unknown absorption band of CO2 isotope C12O16O18.

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