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Unformatted text preview: decade, i.e. close to and not significantly different from zero. The analysis further shows that the statistical model of a constant airborne fraction agrees best with the available data if emissions from land use change are scaled down to 82% or less of their original estimates. Despite the predictions of coupled climate-carbon cycle models, no trend in the airborne fraction can be found. Received 18 August 2009; accepted 23 September 2009; published 7 November 2009. Citation: Knorr, W. (2009), Is the airborne fraction of anthropogenic CO 2 emissions increasing?, Geophys. Res. Lett. , 36, L21710, doi:10.1029/2009GL040613....
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