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Simulating Time-Dependent Atmospheric Chemistry on Venus on a Diurnal Timescale

Presentation #502.03 in the session Venus I (Oral Presentation)

Published onOct 23, 2023
Simulating Time-Dependent Atmospheric Chemistry on Venus on a Diurnal Timescale

Research over the past several decades has identified three primary chemical cycles in Venus’ atmosphere, but significant details about each cycle have proved elusive: the carbon or CO2 cycle includes: production of oxygen due to photodissociation when carbon dioxide is exposed to UV radiation from the Sun on the dayside and the production of CO2 via catalytic cycles involving chlorine species, the sulfur oxidation cycle includes the formation of sulfuric acid from sulfur dioxide as well as the decomposition of sulfuric acid into sulfur dioxide, and the polysulfur (Sx) cycle includes the photodissociation of sulfur compounds (SO2 or OCS) into polysulfur as well as the production of OCS and SO2 [Mills and Allen, PSS, 2007]. Most modeling to date has used either a one dimensional average photochemical model [Krasnopolsky, Icarus, 2012; Bierson and Zhang, JGR Planets, 2019; Bains et al, Astrobiology, 2021; Rimmer et al, PSJ, 2021] or a three dimensional global circulation model (GCM) with limited chemistry [Navarro et al. Icarus, 2021; Parkinson et al. Icarus, 2021]. Photochemistry simulations that explore expected diurnal variations are needed.

We will build upon and run previously written code, Caltech-JPL KINETICS [Yung et al., JAS, 1980; Allen et al., JGR, 1981], to simulate the atmospheric chemistry of Venus through a diurnal cycle. The results will be compared with spacecraft and Earth-based observations of SO2, OCS, HCl, ClO, CO, and O2 [Marcq et al, Sp Sci Rev, 2018; Vandaele et al, Icarus, 2017ab]. A subset of the photochemical model results will be compared with simulations from the Venus Thermospheric General Circulation Model (VTGCM) [A.S. Brecht et al. JGR Planets, 2021]. This project has the potential to bridge the current gap between the predictions made in chemical models and the measurements made through a plethora of spacecraft missions and Earth-based observing campaigns.

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