Ground-based thermal mapping of Venus: HDO and SO2 monitoring and upper limits of NH3, PH3 and HCN at the cloud top - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2024

Ground-based thermal mapping of Venus: HDO and SO2 monitoring and upper limits of NH3, PH3 and HCN at the cloud top

Résumé

As part of a long-term monitoring program, full disk thermal maps of HDO (near 7 microns) and SO2 (near 7 and 19 microns) have been obtained at the cloud top of Venus in 2023, using the TEXES(Texas Echelon Cross-Echelle Spectrograph) imaging spectrometer at the Infrared Telescope Facility (IRTF) at Mauna Kea Observatory. Assuming a constant D/H isotopic ratio, the water abundance has been more or less constant since 2018, at about half its value in 2012-2016. In contrast, the SO2 abundance, which was very high in 2018-2019 and very low between July 2021 and March 2023, has increased by a factor of about 5 between February and July 2023 (close to its maximum level of 2018-2019), and has remained at its high level in September 2023. The origin of these long-term variations is still unclear. In addition, stringent upper limits of NH3 (at 927-931 cm-1), PH3 (at 1161-1164 cm-1) and HCN at 744-748 cm-1) at the cloud top have been obtained in July 2023. These results will be presented and discussed.
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Dates et versions

insu-04503747 , version 1 (13-03-2024)

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Therese Encrenaz, Thomas Greathouse, Rohini Giles, Thomas Widemann, Bruno Bezard, et al.. Ground-based thermal mapping of Venus: HDO and SO2 monitoring and upper limits of NH3, PH3 and HCN at the cloud top. EGU General Assembly 2024, Apr 2024, Vienna and Online, Austria. pp.EGU24-4022, ⟨10.5194/egusphere-egu24-4022⟩. ⟨insu-04503747⟩
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