Articles | Volume 18, issue 13
Atmos. Chem. Phys., 18, 9831–9843, 2018
https://doi.org/10.5194/acp-18-9831-2018

Special issue: The Modular Earth Submodel System (MESSy) (ACP/GMD inter-journal...

Atmos. Chem. Phys., 18, 9831–9843, 2018
https://doi.org/10.5194/acp-18-9831-2018

Research article 12 Jul 2018

Research article | 12 Jul 2018

A very limited role of tropospheric chlorine as a sink of the greenhouse gas methane

Sergey Gromov et al.

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Cited articles

Allan, W., Manning, M. R., Lassey, K. R., Lowe, D. C., and Gomez, A. J.: Modeling the variation of δ13C in atmospheric methane: Phase ellipses and the kinetic isotope effect, Global Biogeochem. Cy., 15, 467–481, https://doi.org/10.1029/2000gb001282, 2001. 
Allan, W., Struthers, H., and Lowe, D. C.: Methane carbon isotope effects caused by atomic chlorine in the marine boundary layer: Global model results compared with Southern Hemisphere measurements, J. Geophys. Res.-Atmos., 112, D04306, https://doi.org/10.1029/2006jd007369, 2007. 
Baker, A. K., Rauthe-Schöch, A., Schuck, T. J., Brenninkmeijer, C. A. M., van Velthoven, P. F. J., Wisher, A., and Oram, D. E.: Investigation of chlorine radical chemistry in the Eyjafjallajökull volcanic plume using observed depletions in non-methane hydrocarbons, Geophys. Res. Lett., 38, L13801, https://doi.org/10.1029/2011GL047571, 2011. 
Baker, A. K., Sauvage, C., Thorenz, U. R., van Velthoven, P., Oram, D. E., Zahn, A., Brenninkmeijer, C. A. M., and Williams, J.: Evidence for strong, widespread chlorine radical chemistry associated with pollution outflow from continental Asia, Sci. Rep., 6, 36821, https://doi.org/10.1038/srep36821, 2016. 
Bergamaschi, P., Hein, R., Brenninkmeijer, C. A. M., and Crutzen, P. J.: Inverse modeling of the global CO cycle 2. Inversion of 13C12C and 18O16O isotope ratios, J. Geophys. Res.-Atmos., 105, 1929–1945, https://doi.org/10.1029/1999jd900819, 2000. 
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Short summary
Using the observational data on 13C (CO) and 13C (CH4) from the extra-tropical Southern Hemisphere (ETSH) and EMAC model we (1) provide an independent, observation-based evaluation of Cl atom concentration variations in the ETSH throughout 1994–2000, (2) show that the role of tropospheric Cl as a sink of CH4 is seriously overestimated in the literature, (3) demonstrate that the 13C/12C ratio of CO is a sensitive indicator for the isotopic composition of reacted CH4 and therefore for its sources.
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