Egan, J.V., Feng, W., James, A.D. et al. (6 more authors) (2025) Is OSSO a Significant Contributor to the Unknown UV Absorber in Venus' Atmosphere? Geophysical Research Letters, 52 (4). e2024GL113090. ISSN 0094-8276
Abstract
It has been proposed that two isomers of the SO dimer (cis- and trans-OSSO) are candidates for the unknown UV absorber in Venus' atmosphere because they have a good spectral match with the absorber, despite the low concentrations predicted by 1D photochemical models. Here OSSO chemistry (production from SO and loss by photolysis, thermal decomposition, and reaction with O and Cl) has been included in the photochemistry scheme of a 3D planetary climate model (PCM-Venus) along with sulfur injection due to meteoric ablation. 1D multiple scattering radiative transfer modeling is then used to predict the resulting top-of-the-atmosphere reflectance produced by OSSO. The modeled OSSO concentrations are shown to be ∼3 orders of magnitude too low to explain the observed absorbance levels, and the predicted ratio of the OSSO isomers provides an unsatisfactory match to the spectral shape of the unknown absorber.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2025. The Author(s). This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Venus, atmospheres, global climate models, radiative processes, chemical kinetics and photochemical properties, unknown UV absorber, OSSO, atmospheric modeling |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Feb 2025 09:31 |
Last Modified: | 06 Mar 2025 10:17 |
Status: | Published |
Publisher: | American Geophysical Union |
Identification Number: | 10.1029/2024GL113090 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:222858 |