Articles | Volume 20, issue 4
https://doi.org/10.5194/cp-20-991-2024
https://doi.org/10.5194/cp-20-991-2024
Research article
 | 
25 Apr 2024
Research article |  | 25 Apr 2024

No detectable influence of the carbonate ion effect on changes in stable carbon isotope ratios (δ13C) of shallow dwelling planktic foraminifera over the past 160 kyr

Peter Köhler and Stefan Mulitza

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Short summary
We constructed 160 kyr long mono-specific stacks of δ13C and of δ18O from the wider tropics from the planktic foraminifera G. ruber and/or T. sacculifer and compared them with carbon cycle simulations using the BICYCLE-SE model. In our stacks and our model-based interpretation, we cannot detect a species-specific isotopic fractionation during hard-shell formation as a function of carbonate chemistry in the surrounding seawater, something which is called a carbonate ion effect.