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    Top-Down CO Emissions Based On IASI Observations and Hemispheric Constraints on OH Levels

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    Authors
    Müller, J.-F.
    Stavrakou, T.
    Bauwens, M.
    George, M.
    Hurtmans, D.
    Coheur, P.-F.
    Clerbaux, C.
    Sweeney, C.
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    Discipline
    Earth and related Environmental sciences
    Subject
    Carbon monoxide
    Particulate emissions
    Carbon monoxide emissions
    Chemistry transport model
    Hydrocarbon oxidation
    Hydroxyl
    Infrared atmospheric sounding interferometers
    Inverse modeling
    Northern Hemispheres
    Photochemical sources
    Inverse problems
    Audience
    Scientific
    Date
    2018
    Metadata
    Show full item record
    Description
    Assessments of carbon monoxide emissions through inverse modeling are dependent on the modeled abundance of the hydroxyl radical (OH) which controls both the primary sink of CO and its photochemical source through hydrocarbon oxidation. However, most chemistry transport models (CTMs) fall short of reproducing constraints on hemispherically averaged OH levels derived from methylchloroform (MCF) observations. Here we construct five different OH fields compatible with MCF-based analyses, and we prescribe those fields in a global CTM to infer CO fluxes based on Infrared Atmospheric Sounding Interferometer (IASI) CO columns. Each OH field leads to a different set of optimized emissions. Comparisons with independent data (surface, ground-based remotely sensed, aircraft) indicate that the inversion adopting the lowest average OH level in the Northern Hemisphere (7.8 × 105 molec cm−3, ∼18% lower than the best estimate based on MCF measurements) provides the best overall agreement with all tested observation data sets.
    Citation
    Müller, J.-F.; Stavrakou, T.; Bauwens, M.; George, M.; Hurtmans, D.; Coheur, P.-F.; Clerbaux, C.; Sweeney, C. (2018). Top-Down CO Emissions Based On IASI Observations and Hemispheric Constraints on OH Levels. , Geophysical Research Letters, Vol. 45, Issue 3, 1621-1629, DOI: 10.1002/2017GL076697.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/6848
    doi: http://dx.doi.org/10.1002/2017GL076697
    scopus: 2-s2.0-85041215056
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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