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- W2897428371 abstract "After the first sporadic detections of an ozone (O3) nighttime layer in the 90–100 km altitude range (Montmessin et al., 2011), we report here the discovery of another, permanent ozone layer on Venus, restricted to high latitudes (polewards of 50° both N and S) and located at the upper cloud level near 70 km. This detection was performed during a reanalysis of the whole SPICAV-UV nadir dataset through UV absorption near 250 nm in the backscattered solar light. The O3 volume mixing ratio peaks in the 10–20 ppbv range, yielding observable column densities in the 0.1–0.5 Dobson units (DU), comparable to nominal values on Mars but much smaller than for Earth ( ∼ 300 DU). These measurements are supported by our 3D-photochemical model coupled with the LMD-IPSL GCM (Lebonnois et al., 2010), which indicates that the ozone layer identified by SPICAV results from downward transport of O2 ( ∼ 50 ppmv) molecules over the poles by the mean meridional circulation. Our findings do not contradict previous upper limits ( < 2 ppmv) based on O2 measurements (Mills, 1999), since they were restricted to lower latitudes only." @default.
- W2897428371 created "2018-10-26" @default.
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- W2897428371 date "2019-02-01" @default.
- W2897428371 modified "2023-10-18" @default.
- W2897428371 title "Discovery of cloud top ozone on Venus" @default.
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- W2897428371 doi "https://doi.org/10.1016/j.icarus.2018.10.006" @default.
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