Preprints
https://doi.org/10.5194/egusphere-2023-1718
https://doi.org/10.5194/egusphere-2023-1718
21 Aug 2023
 | 21 Aug 2023

Carbon isotopes in the marine biogeochemistry model FESOM2.1-REcoM3

Martin Butzin, Ying Ye, Christoph Völker, Özgür Gürses, Judith Hauck, and Peter Köhler

Abstract. In this paper we describe the implementation of the carbon isotopes 13C and 14C (radiocarbon) into the marine biogeochemistry model REcoM3. The implementation is tested in long-term equilibrium simulations where REcoM3 is coupled with the ocean general circulation model FESOM2.1, applying a low-resolution configuration and idealized climate forcing. Focusing on the carbon-isotopic composition of dissolved inorganic carbon (δ13CDIC and Δ14CDIC), our model results are largely consistent with reconstructions for the pre-anthropogenic period. Our simulations also exhibit discrepancies, e.g., in upwelling regions and the interior of the North Pacific. Some of these differences are due to the limitations of our ocean circulation model setup which results in a rather shallow meridional overturning circulation. We additionally study the accuracy of two simplified modelling approaches for dissolved inorganic 14C, which are faster (15 % and about a factor of five, respectively) than the complete consideration of the marine radiocarbon cycle. The accuracy of both simplified approaches is better than 5 % which should be sufficient for most studies of Δ14CDIC.

Martin Butzin, Ying Ye, Christoph Völker, Özgür Gürses, Judith Hauck, and Peter Köhler

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1718', Anne L. Morée, 01 Sep 2023
    • AC2: 'Reply on RC1', Martin Butzin, 21 Dec 2023
  • RC2: 'Comment on egusphere-2023-1718', Andreas Schmittner, 01 Dec 2023
    • AC1: 'Reply on RC2', Martin Butzin, 21 Dec 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1718', Anne L. Morée, 01 Sep 2023
    • AC2: 'Reply on RC1', Martin Butzin, 21 Dec 2023
  • RC2: 'Comment on egusphere-2023-1718', Andreas Schmittner, 01 Dec 2023
    • AC1: 'Reply on RC2', Martin Butzin, 21 Dec 2023
Martin Butzin, Ying Ye, Christoph Völker, Özgür Gürses, Judith Hauck, and Peter Köhler

Model code and software

FESOM2.1-REcoM3 source code with carbon isotopes Martin Butzin https://doi.org/10.5281/zenodo.8169243

Martin Butzin, Ying Ye, Christoph Völker, Özgür Gürses, Judith Hauck, and Peter Köhler

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Short summary
In this paper we describe the implementation of the carbon isotopes 13C and 14C into the marine biogeochemistry model FESOM2.1-REcoM3 and present results of long-term test simulations. Our model results are largely consistent with marine carbon isotope reconstructions for the pre-anthropogenic period but also also exhibit some discrepancies.