Articles | Volume 19, issue 3
https://doi.org/10.5194/acp-19-1703-2019
https://doi.org/10.5194/acp-19-1703-2019
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08 Feb 2019
Research article | Highlight paper |  | 08 Feb 2019

Evidence for a major missing source in the global chloromethane budget from stable carbon isotopes

Enno Bahlmann, Frank Keppler, Julian Wittmer, Markus Greule, Heinz Friedrich Schöler, Richard Seifert, and Cornelius Zetzsch

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Latest update: 19 Apr 2024
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Short summary
Chloromethane is the most important natural carrier of chlorine to the stratosphere. From a newly determined carbon isotope effect of −11.2 ‰ for the tropospheric loss of CH3Cl we derive a tropical rainforest CH3Cl source of 670 ± 200 Gg a−1, 60 % smaller than previous estimates. A revision of previous bottom-up estimates using above-ground biomass instead of rainforest area strongly supports this lower estimate. Our results suggest a large unknown tropical value of 1530 ± 200 Gg a−1.
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