A re-analysis of the circulation in the “transition region” of Venus atmosphere (90-130 km) with the Venus PCM - Laboratoire de Météorologie Dynamique (LMD)
Poster De Conférence Année : 2024

A re-analysis of the circulation in the “transition region” of Venus atmosphere (90-130 km) with the Venus PCM

Résumé

In this study we use the most recent version of the ground-to-thermosphere VPCM [1] that includes an ionosphere model, ambipolar diffusion and nitrogen chemistry [2]. This tool allows us to investigate and identify in 3D potential mechanisms responsible for the observed variability in Venus's atmosphere, in the region between 90 km and 130 km altitude. NO and O 2 (Δg) airglows, are commonly used to shed light on the global dynamics and circulation patterns above 90 km. Their characteristics are a combination of horizontal, vertical transport and chemical net reactions [3,4].

We performed sensitivity tests of unconstrained parameters (e.g. gravity waves drag and eddy diffusion vertical profile) to evaluate the impact on the dynamical structures, O densities, temperature and O 2 (Δg) nightglow characteristics. These results depict possible scenarios useful to interpret future EnVision observations of trace compounds in those mesosphere layers currently poorly constrained, and not fully explained by current 3D models.

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Dates et versions

insu-04689071 , version 1 (05-09-2024)

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Gabriella Gilli, Antoine Martinez, Aurélien Stolzenbach, Thomas Navarro, Sébastien Lebonnois, et al.. A re-analysis of the circulation in the “transition region” of Venus atmosphere (90-130 km) with the Venus PCM. Europlanet Science Congress 2024, Sep 2024, Berlin, Germany. EPSC Abstracts, 17, pp.EPSC2024-256, 2024, ⟨10.5194/epsc2024-256⟩. ⟨insu-04689071⟩
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