Determination of the Venus eddy diffusion profile from CO and CO2 profiles using SOIR/Venus Express observations

A. Mahieux; R. V. Yelle; N. Yoshida; S. Robert; A. Piccialli; H. Nakagawa; Y. Kasaba; F. P. Mills; A. C. Vandaele

doi:10.1016/j.icarus.2021.114388

Determination of the Venus eddy diffusion profile from CO and CO₂ profiles using SOIR/Venus Express observations

A. Mahieux^*, R. V. Yelle, N. Yoshida, S. Robert, A. Piccialli, H. Nakagawa, Y. Kasaba, F. P. Mills, A. C. Vandaele

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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.

Original language	English
Article number	114388
Journal	Icarus
Volume	361
DOIs	https://doi.org/10.1016/j.icarus.2021.114388
Publication status	Published - Jun 2021

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@article{c44ce4b540c1437398a616fb36f4ecfa,

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 = "Publisher Copyright: {\textcopyright} 2021 The Authors",

year = "2021",

month = jun,

doi = "10.1016/j.icarus.2021.114388",

language = "English",

volume = "361",

journal = "Icarus",

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TY - JOUR

T1 - Determination of the Venus eddy diffusion profile from CO and CO2 profiles using SOIR/Venus Express observations

AU - Mahieux, A.

AU - Yelle, R. V.

AU - Yoshida, N.

AU - Robert, S.

AU - Piccialli, A.

AU - Nakagawa, H.

AU - Kasaba, Y.

AU - Mills, F. P.

AU - Vandaele, A. C.

PY - 2021/6

Y1 - 2021/6

N2 - 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.

AB - 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.

KW - Eddy diffusion coefficient

KW - Mesosphere

KW - Modelling

KW - Thermosphere

KW - Venus

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U2 - 10.1016/j.icarus.2021.114388

DO - 10.1016/j.icarus.2021.114388

M3 - Article

SN - 0019-1035

VL - 361

JO - Icarus

JF - Icarus

M1 - 114388

ER -

Determination of the Venus eddy diffusion profile from CO and CO₂ profiles using SOIR/Venus Express observations

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