New insight into the atmospheric chloromethane budget gained using stable carbon isotope ratios F. Keppler, D. B. Harper, T. Röckmann, R. M. Moore, and J. T. G. Hamilton School of Agriculture and Food Science, Queen’s University Belfast, Newforge Lane, Belfast BT9 5PX, UK Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany Department of Oceanography, Dalhousie Unive...