Publication Date:
2019
Description:
〈b〉Evidence for a major missing source in the global chloromethane budget from stable carbon isotopes〈/b〉〈br〉
Enno Bahlmann, Frank Keppler, Julian Wittmer, Markus Greule, Heinz Friedrich Schöler, Richard Seifert, and Cornelius Zetzsch〈br〉
Atmos. Chem. Phys., 19, 1703-1719, https://doi.org/10.5194/acp-19-1703-2019, 2019〈br〉
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 CH〈sub〉3〈/sub〉Cl we derive a tropical rainforest CH〈sub〉3〈/sub〉Cl source of 670 ± 200 Gg a〈sup〉−1〈/sup〉, 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〈sup〉−1〈/sup〉.
Print ISSN:
1680-7316
Electronic ISSN:
1680-7324
Topics:
Geosciences
