Evidence for SO<sub>2</sub> latitudinal variations below the clouds of Venus - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2021

Evidence for SO2 latitudinal variations below the clouds of Venus

(1) , (1) , (1) , (2)
1
2
Emmanuel Marcq
Ismaïl Amine
  • Function : Author
Marc Duquesnoy
  • Function : Author
  • PersonId : 1052144

Abstract

Sulphur dioxide (SO2) is highly variable above the clouds of Venus, yet no spatial or temporal variability below the clouds had been known until now. Aims. In order to constrain Venus's atmospheric circulation and chemistry (including possible volcanic outgassing), more accurate SO2 measurements below the clouds are therefore needed. We used the high-resolution iSHELL spectrometer located at the NASA IRTF to record thermal night-side spectra, which we fitted using an updated forward radiative transfer model that was previously employed to process SpeX/IRTF and VIRTIS-H/Venus Express spectra. We report, for the first time, an increase in SO2 with increasing latitude (+30% between the minimum near 15°S and > 35°N). This is consistent with the interaction between the Hadley-cell circulation and a postulated vertical profile in SO2 estimated to increase between 30 and 40 km in altitude, as previously suggested by in situ ISAV measurements. This SO2 variability challenges our current understanding of Venus's tropospheric thermochemistry and underlines the high scientific return from high-resolution spectroscopy from, for example, future orbiters.
Fichier principal
Vignette du fichier
aa40837-21.pdf (1.05 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03207315 , version 1 (24-04-2021)
insu-03207315 , version 2 (26-04-2021)

Identifiers

Cite

Emmanuel Marcq, Ismaïl Amine, Marc Duquesnoy, B. Bézard. Evidence for SO2 latitudinal variations below the clouds of Venus. Astronomy and Astrophysics - A&A, 2021, 648, L8 (4p.). ⟨10.1051/0004-6361/202140837⟩. ⟨insu-03207315v2⟩
122 View
42 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More