Articles | Volume 19, issue 13
Biogeosciences, 19, 3305–3315, 2022
https://doi.org/10.5194/bg-19-3305-2022
Biogeosciences, 19, 3305–3315, 2022
https://doi.org/10.5194/bg-19-3305-2022
Research article
15 Jul 2022
Research article | 15 Jul 2022

Physiological control on carbon isotope fractionation in marine phytoplankton

Karen M. Brandenburg et al.

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Short summary
Reconstructions of past CO2 concentrations rely on proxy estimates, with one line of proxies relying on the CO2-dependence of stable carbon isotope fractionation in marine phytoplankton. Culturing experiments provide insights into which processes may impact this. We found, however, that the methods with which these culturing experiments are performed also influence 13C fractionation. Caution should therefore be taken when extrapolating results from these experiments to proxy applications.
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