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• W2922463162 abstract "Since January 2012 we have been monitoring the behavior of sulfur dioxide and water on Venus, using the Texas Echelon Cross-Echelle Spectrograph (TEXES) imaging spectrometer at the NASA InfraRed Telescope Facility (IRTF, Mauna Kea Observatory). We present here the observations obtained between January 2016 and September 2018. As in the case of our previous runs, data were recorded around 1345 cm −1 (7.4 μ m). The molecules SO 2 , CO 2 , and HDO (used as a proxy for H 2 O) were observed, and the cloudtop of Venus was probed at an altitude of about 64 km. The volume mixing ratio of SO 2 was estimated using the SO 2 /CO 2 line depth ratios of weak transitions; the H 2 O volume mixing ratio was derived from the HDO/CO 2 line depth ratio, assuming a D/H ratio of 200 times the Vienna Standard Mean Ocean Water (VSMOW). As reported in our previous analyses, the SO 2 mixing ratio shows strong variations with time and also over the disk, showing evidence of the formation of SO 2 plumes with a lifetime of a few hours; in contrast, the H 2 O abundance is remarkably uniform over the disk and shows moderate variations as a function of time. We performed a statistical analysis of the behavior of the SO 2 plumes, using all TEXES data between 2012 and 2018. They appear mostly located around the equator. Their distribution as a function of local time seems to show a depletion around noon; we do not have enough data to confirm this feature definitely. The distribution of SO 2 plumes as a function of longitude shows no clear feature, apart from a possible depletion around 100E–150E and around 300E–360E. There seems to be a tendency for the H 2 O volume mixing ratio to decrease after 2016, and for the SO 2 mixing ratio to increase after 2014. However, we see no clear anti-correlation between the SO 2 and H 2 O abundances at the cloudtop, neither on the individual maps nor over the long term. Finally, there is a good agreement between the TEXES results and those obtained in the UV range (SPICAV/Venus Express and UVI/Akatsuki) at a slightly higher altitude. This agreement shows that SO 2 observations obtained in the thermal infrared can be used to extend the local time coverage of the SO 2 measurements obtained in the UV range." @default.
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• W2922463162 date "2019-03-01" @default.
• W2922463162 modified "2023-10-18" @default.
• W2922463162 title "HDO and SO₂ thermal mapping on Venus" @default.
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• W2922463162 doi "https://doi.org/10.1051/0004-6361/201833511" @default.
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