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    Chemical Feedback From Decreasing Carbon Monoxide Emissions

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    Name:
    Gaubert_et_al-2017-Geophysical ...
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    FInal Published Version
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    Author
    Gaubert, B. cc
    Worden, H. M. cc
    Arellano, A. F. J. cc
    Emmons, L. K. cc
    Tilmes, S. cc
    Barré, J.
    Martinez Alonso, S.
    Vitt, F. cc
    Anderson, J. L.
    Alkemade, F.
    Houweling, S. cc
    Edwards, D. P. cc
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    Affiliation
    Univ Arizona, Dept Hydrol & Atmospher Sci
    Issue Date
    2017-10-16
    Keywords
    tropospheric composition
    data assimilation
    global chemistry transport model
    chemistry climate modeling
    air pollution
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Chemical Feedback From Decreasing Carbon Monoxide Emissions 2017, 44 (19):9985 Geophysical Research Letters
    Journal
    Geophysical Research Letters
    Rights
    © 2017. American Geophysical Union. 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
    Understanding changes in the burden and growth rate of atmospheric methane (CH4) has been the focus of several recent studies but still lacks scientific consensus. Here we investigate the role of decreasing anthropogenic carbon monoxide (CO) emissions since 2002 on hydroxyl radical (OH) sinks and tropospheric CH4 loss. We quantify this impact by contrasting two model simulations for 2002-2013: (1) a Measurement of the Pollution in the Troposphere (MOPITT) CO reanalysis and (2) a Control-Run without CO assimilation. These simulations are performed with the Community Atmosphere Model with Chemistry of the Community Earth System Model fully coupled chemistry climate model with prescribed CH4 surface concentrations. The assimilation of MOPITT observations constrains the global CO burden, which significantly decreased over this period by similar to 20%. We find that this decrease results to (a) increase in CO chemical production, (b) higher CH4 oxidation by OH, and (c) similar to 8% shorter CH4 lifetime. We elucidate this coupling by a surrogate mechanism for CO-OH-CH4 that is quantified from the full chemistry simulations.
    Note
    6 month embargo; published: 4 October 2017
    ISSN
    00948276
    DOI
    10.1002/2017GL074987
    Version
    Final published version
    Sponsors
    National Aeronautics and Space Administration (NASA) Earth Observing System (EOS) Program; National Science Foundation (NSF); U.S. Department of Energy (DOE); NASA [NNX13AK24G]
    Additional Links
    http://doi.wiley.com/10.1002/2017GL074987
    ae974a485f413a2113503eed53cd6c53
    10.1002/2017GL074987
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