Worden, H. M.
Arellano, A. F. J.
Emmons, L. K.
Martinez Alonso, S.
Anderson, J. L.
Edwards, D. P.
AffiliationUniv Arizona, Dept Hydrol & Atmospher Sci
global chemistry transport model
chemistry climate modeling
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationChemical Feedback From Decreasing Carbon Monoxide Emissions 2017, 44 (19):9985 Geophysical Research Letters
JournalGeophysical Research Letters
Rights©2017. American Geophysical Union. All Rights Reserved.
Collection InformationThis 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 email@example.com.
AbstractUnderstanding 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.
Note6 month embargo; published: 4 October 2017
VersionFinal published version
SponsorsNational Aeronautics and Space Administration (NASA) Earth Observing System (EOS) Program; National Science Foundation (NSF); U.S. Department of Energy (DOE); NASA [NNX13AK24G]