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    New constraints on biogenic emissions using satellite-based estimates of carbon monoxide fluxes

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    Authors
    Worden, H.M.
    Bloom, A.A.
    Worden, J.R.
    Jiang, Z.
    Marais, E.A.
    Stavrakou, T.
    Gaubert, B.
    Lacey, F.
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    Discipline
    Earth and related Environmental sciences
    Audience
    Scientific
    Date
    2019
    Metadata
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    Description
    Biogenic non-methane volatile organic compounds (NMVOCs) emitted from vegetation are a primary source for the chemical production of carbon monoxide (CO) in the atmosphere, and these biogenic emissions account for about 18 % of the global CO burden. Partitioning CO fluxes to different source types in top-down inversion methods is challenging; typically a simple scaling of the posterior flux to prior flux values for fossil fuel, biogenic and biomass burning sources is used. Here we show top-down estimates of biogenic CO fluxes using a Bayesian inference approach, which explicitly accounts for both posterior and a priori CO flux uncertainties. This approach re-partitions CO fluxes following inversion of Measurements Of Pollution In The Troposphere (MOPITT) CO observations with the GEOS-Chem model, a global chemical transport model driven by assimilated meteorology from the NASA Goddard Earth Observing System (GEOS). We compare these results to the prior information for CO used to represent biogenic NMVOCs from GEOS-Chem, which uses the Model of Emissions of Gases and Aerosols from Nature (MEGAN) for biogenic emissions. We evaluate the a posteriori biogenic CO fluxes against top-down estimates of isoprene fluxes using Ozone Monitoring Instrument (OMI) formaldehyde observations. We find similar seasonality and spatial consistency in the posterior CO and top-down isoprene estimates globally. For the African savanna region, both top-down CO and isoprene seasonality vary significantly from the MEGAN a priori inventory. This method for estimating biogenic sources of CO will provide an independent constraint on modeled biogenic emissions and has the potential for diagnosing decadal-scale changes in emissions due to land-use change and climate variability.
    Citation
    Worden, H.M.; Bloom, A.A.; Worden, J.R.; Jiang, Z.; Marais, E.A.; Stavrakou, T.; Gaubert, B.; Lacey, F. (2019). New constraints on biogenic emissions using satellite-based estimates of carbon monoxide fluxes. , Atmospheric Chemistry and Physics, Vol. 19, Issue 21, 13569-13579, DOI: 10.5194/acp-19-13569-2019.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7392
    doi: http://dx.doi.org/10.5194/acp-19-13569-2019
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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