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    Carbon photochemical escape rates from the modern Mars atmosphere

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    Thumbnail
    Name:
    v6.pdf
    Embargo:
    2023-02-14
    Size:
    1.993Mb
    Format:
    PDF
    Description:
    Final Accepted Manuscript
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    Author
    Lo, Daniel Y.
    Yelle, Roger V.
    Lillis, Robert J.
    Deighan, Justin I.
    Affiliation
    Lunar and Planetary Laboratory, The University of Arizona
    Issue Date
    2021-02-14
    Keywords
    Atmospheres, chemistry
    Atmospheres, evolution
    Mars, atmosphere
    
    Metadata
    Show full item record
    Publisher
    Academic Press Inc.
    Citation
    Lo, D. Y., Yelle, R. V., Lillis, R. J., & Deighan, J. I. (2021). Carbon photochemical escape rates from the modern Mars atmosphere. Icarus, 360, 114371.
    Journal
    Icarus
    Rights
    © 2021 Elsevier Inc. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We provide a comprehensive update of photochemical escape rates of atomic carbon from the present-day Martian atmosphere using a one-dimensional photochemical model and a Monte Carlo escape model. The photochemical model incorporates new results relevant to carbon photochemistry at Mars, including new cross sections for photodissociation of CO2 into C and O2 (Lu et al. 2014) and electron impact dissociation of CO (Ajello et al. 2019). We find the newly included channel of CO2 photodissociation to be the largest contributor to C escape, at 34%–58%. CO photodissociation and CO+ dissociative recombination, which have been discussed extensively in the literature, also show up as significant sources of hot C atoms, with respective contributions of 15%–23% and 7%–10%. Electron impact dissociation of CO2 (11%–15%) and photoionization of CO (6%–20%) are also important channels. Overall, escape rates vary over 3–11×1023 s−1, with an increase of 70% at perihelion compared to aphelion, and a much larger increase of 133% at solar maximum compared to solar minimum. While these present escape rates give a total integrated escape of only 1.3 mbar of CO2 when multiplied by 3.6 billion years, the better characterization of carbon photochemistry and escape from this study will enable us to more reliably extrapolate backwards in time to when conditions of the Martian atmosphere were significantly different from those of today.
    Note
    24 month embargo; first published online 14 February 2021
    ISSN
    0019-1035
    DOI
    10.1016/j.icarus.2021.114371
    Version
    Final accepted manuscript
    Sponsors
    National Aeronautics and Space Administration
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.icarus.2021.114371
    Scopus Count
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    UA Faculty Publications

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