Articles | Volume 13, issue 14
https://doi.org/10.5194/bg-13-4237-2016
https://doi.org/10.5194/bg-13-4237-2016
Research article
 | 
26 Jul 2016
Research article |  | 26 Jul 2016

Evaluation of 4 years of continuous δ13C(CO2) data using a moving Keeling plot method

Sanam Noreen Vardag, Samuel Hammer, and Ingeborg Levin

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Using a synthetic dataset, we show how to best determine the mean source signature, δS, at high temporal resolution using continuous CO2 and δ13C(CO2) data. We apply this method to measured data from Heidelberg and find a distinct seasonal cycle of δS. Disentangling this record into its source components requires the isotopic end members of CO2 from the biosphere and those from the fuel mix. They can be estimated from the δS record, but only when their relative share is close to 100 %.
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