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Author
Gaubert, B.
Worden, H. M.

Arellano, A. F. J.

Emmons, L. K.

Tilmes, S.

Barré, J.
Martinez Alonso, S.
Vitt, F.

Anderson, J. L.
Alkemade, F.
Houweling, S.

Edwards, D. P.

Affiliation
Univ Arizona, Dept Hydrol & Atmospher SciIssue Date
2017-10-16Keywords
tropospheric compositiondata assimilation
global chemistry transport model
chemistry climate modeling
air pollution
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AMER GEOPHYSICAL UNIONCitation
Chemical Feedback From Decreasing Carbon Monoxide Emissions 2017, 44 (19):9985 Geophysical Research LettersJournal
Geophysical Research LettersRights
© 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 2017ISSN
00948276Version
Final published versionSponsors
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/10.1002/2017GL074987ae974a485f413a2113503eed53cd6c53
10.1002/2017GL074987