@article{dc2e8c6908ab421fb1e649d2805a6b15,
title = "Determination of the Venus eddy diffusion profile from CO and CO2 profiles using SOIR/Venus Express observations",
abstract = "We present a study of the SOIR/Venus Express CO2 and CO profiles in order to constrain the eddy diffusion profile in the Venus mesosphere (80 to 130 km of altitude). We compute the mean number density profile of both species, and the hydrostatic temperature based on the CO2 mean density profile. We use a 1D-photochemical/diffusion model to adjust the eddy diffusion profile such that the 1D-model and SOIR CO profiles best agree. We compare our results with eddy diffusion profiles found in the literature. We use our approach to revisit the He and CO2 profiles from Pioneer Venus probe mass spectrometer in order to derive an eddy diffusion profile extending from 80 to 200 km of altitude. Our eddy diffusion profile is different in shape and in magnitude compared to the Pioneer Venus profile: it is equal to 3.6 × 106 cm2/s at 110 km, 7.5 × 106 cm2/s at 120 km, 0.4 × 106 cm2/s at 130 km, and 201 × 106 cm2/s at 140 km, and constant below 110 km and above 140 km. This new eddy diffusion profile can be used in Venus Global Circulation Models as well as 1D-photochemical models.",
keywords = "Eddy diffusion coefficient, Mesosphere, Modelling, Thermosphere, Venus",
author = "A. Mahieux and Yelle, {R. V.} and N. Yoshida and S. Robert and A. Piccialli and H. Nakagawa and Y. Kasaba and Mills, {F. P.} and Vandaele, {A. C.}",
note = "Funding Information: Venus Express is a planetary mission from the European Space Agency (ESA). We wish to thank all ESA members who participated in the mission, in particular, H. Svedhem and D. Titov. We thank our collaborators at IASB-BIRA (Belgium), Latmos (France), and IKI (Russia). The research program was supported by the Belgian Federal Science Policy Office and the European Space Agency (ESA, PRODEX program, contracts C 90268, 90113, 17645, 90323, and 4000107727). A. Mahieux was supported by the Marie Sk{\l}odowska-Curie Action from the European Commission under grant number 838587. S. Robert thanks BELSPO for the FED-tWIN funding (Prf-2019-077 - RT-MOLEXO). F. Mills was supported by NASA grant NNX16AN03G to SSI. Funding Information: Venus Express is a planetary mission from the European Space Agency (ESA). We wish to thank all ESA members who participated in the mission, in particular, H. Svedhem and D. Titov. We thank our collaborators at IASB-BIRA (Belgium), Latmos (France), and IKI (Russia). The research program was supported by the Belgian Federal Science Policy Office and the European Space Agency (ESA, PRODEX program, contracts C 90268, 90113, 17645, 90323, and 4000107727). A. Mahieux was supported by the Marie Sk?odowska-Curie Action from the European Commission under grant number 838587. S. Robert thanks BELSPO for the FED-tWIN funding (Prf-2019-077 - RT-MOLEXO). F. Mills was supported by NASA grant NNX16AN03G to SSI. Publisher Copyright: {\textcopyright} 2021 The Authors",
year = "2021",
month = jun,
doi = "10.1016/j.icarus.2021.114388",
language = "English (US)",
volume = "361",
journal = "Icarus",
issn = "0019-1035",
publisher = "Academic Press Inc.",
}