Crichton, K. A. http://orcid.org/0000-0001-8748-0438
Bouttes, N.
Roche, D. M.
Chappellaz, J.
Krinner, G.
Article History
Received: 16 February 2016
Accepted: 22 July 2016
First Online: 22 August 2016
Change Date: 6 September 2016
Change Type: Corrigendum
Change Details: The original version of this Letter contained a typographical error in the final sentence of the first paragraph in the main text. This sentence should have read 'The ratio, described by its δ13CO2 value7, is strongly affected by the exchange of carbon between the biosphere and the atmosphere because photosynthesis preferentially takes up 12C, resulting in a low δ13C in biosphere-derived carbon, at a mean value around –25‰ (ref. 8).' This has been corrected in all the online versions of this Letter.
Competing interests
: The authors declare no competing financial interests.