Carbon fixation of a temperate plankton community in response to calcium- and silicate-based Ocean Alkalinity Enhancement using air-sea gas exchange measurements

Schneider, Julieta; Riebesell, Ulf; Moras, Charly André; Marín-Samper, Laura; Kittu, Leila Richards; Ortíz-Cortes, Joaquín; Schulz, Kai Georg

doi:10.5194/bg-23-137-2026

Articles | Volume 23, issue 1

https://doi.org/10.5194/bg-23-137-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-23-137-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 1

Research article

|

08 Jan 2026

Research article |

| 08 Jan 2026

Carbon fixation of a temperate plankton community in response to calcium- and silicate-based Ocean Alkalinity Enhancement using air-sea gas exchange measurements

Julieta Schneider, Ulf Riebesell, Charly André Moras, Laura Marín-Samper, Leila Richards Kittu, Joaquín Ortíz-Cortes, and Kai Georg Schulz

Supplement

https://doi.org/10.5194/bg-23-137-2026-supplement

Data sets

KOSMOS 2022 Bergen mesocosm study on ocean alkalinity enhancement: carbonate chemistry, CO2 flux data and calcification estimates Julieta Schneider et al. https://doi.org/10.1594/PANGAEA.983061

KOSMOS 2022 Bergen mesocosm study on ocean alkalinity enhancement: phytoplankton metabolic rates L. Marín-Samper et al. https://doi.org/10.1594/PANGAEA.972371

Download

Article (1716 KB)
Full-text XML

Short summary

Ocean Alkalinity Enhancement (OAE) is an approach to sequester atmospheric CO₂ in the ocean and may alleviate ocean acidification. A large-scale mesocosm experiment in Norway tested calcium- and silicate-based OAE, increasing total alkalinity (TA) by 0–600 µmol kg^-1 and measuring CO₂ gas exchange. While TA remained stable, we found mineral-type and/or pCO₂/pH effects on coccolithophorid calcification, net community production and zooplankton respiration, providing insights for future OAE trials.