Chemical Feedback From Decreasing Carbon Monoxide Emissions

B. Gaubert, H. M. Worden, A. F.J. Arellano, L. K. Emmons, S. Tilmes, J. Barré, S. Martinez Alonso, F. Vitt, J. L. Anderson, F. Alkemade, S. Houweling, D. P. Edwards

Research output: Research - peer-reviewArticle

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 ~20%. We find that this decrease results to (a) increase in CO chemical production, (b) higher CH4 oxidation by OH, and (c) ~8% shorter CH4 lifetime. We elucidate this coupling by a surrogate mechanism for CO-OH-CH4 that is quantified from the full chemistry simulations.

LanguageEnglish (US)
Pages9985-9995
Number of pages11
JournalGeophysical Research Letters
Volume44
Issue number19
DOIs
StatePublished - Oct 16 2017

Fingerprint

carbon monoxide
methylidyne
chemical
hydroxyl radicals
chemistry
simulation
hydroxyl radical
assimilation
troposphere
pollution
climate models
sinks
methane
atmospheres
life (durability)
oxidation
climate modeling
atmosphere
loss

Keywords

  • air pollution
  • chemistry climate modeling
  • data assimilation
  • global chemistry transport model
  • tropospheric composition

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Gaubert, B., Worden, H. M., Arellano, A. F. J., Emmons, L. K., Tilmes, S., Barré, J., ... Edwards, D. P. (2017). Chemical Feedback From Decreasing Carbon Monoxide Emissions. Geophysical Research Letters, 44(19), 9985-9995. DOI: 10.1002/2017GL074987

Chemical Feedback From Decreasing Carbon Monoxide Emissions. / 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.

In: Geophysical Research Letters, Vol. 44, No. 19, 16.10.2017, p. 9985-9995.

Research output: Research - peer-reviewArticle

Gaubert, B, Worden, HM, Arellano, AFJ, Emmons, LK, Tilmes, S, Barré, J, Martinez Alonso, S, Vitt, F, Anderson, JL, Alkemade, F, Houweling, S & Edwards, DP 2017, 'Chemical Feedback From Decreasing Carbon Monoxide Emissions' Geophysical Research Letters, vol 44, no. 19, pp. 9985-9995. DOI: 10.1002/2017GL074987
Gaubert B, Worden HM, Arellano AFJ, Emmons LK, Tilmes S, Barré J et al. Chemical Feedback From Decreasing Carbon Monoxide Emissions. Geophysical Research Letters. 2017 Oct 16;44(19):9985-9995. Available from, DOI: 10.1002/2017GL074987
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./ Chemical Feedback From Decreasing Carbon Monoxide Emissions. In: Geophysical Research Letters. 2017 ; Vol. 44, No. 19. pp. 9985-9995
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