Articles | Volume 21, issue 24
https://doi.org/10.5194/bg-21-5707-2024
https://doi.org/10.5194/bg-21-5707-2024
Research article
 | 
20 Dec 2024
Research article |  | 20 Dec 2024

Responses of microbial metabolic rates to non-equilibrated silicate- versus calcium-based ocean alkalinity enhancement

Laura Marín-Samper, Javier Arístegui, Nauzet Hernández-Hernández, and Ulf Riebesell

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Cited articles

Bach, L. T., Gill, S. J., Rickaby, R. E. M., Gore, S., and Renforth, P.: CO2 Removal With Enhanced Weathering and Ocean Alkalinity Enhancement: Potential Risks and Co-benefits for Marine Pelagic Ecosystems, Front. Clim., 1, 7, https://doi.org/10.3389/fclim.2019.00007, 2019. 
Barber, R. T. and Hiscock, M. R.: A rising tide lifts all phytoplankton: Growth response of other phytoplankton taxa in diatom-dominated blooms, Global Biogeochem. Cy., 20, 1–12, https://doi.org/10.1029/2006GB002726, 2006. 
Carritt, D. E. and Carpenter, J. H.: Comparison and evaluation of currently employed modifications of the Winkler method for determining dissolved oxygen in seawater, A NASCO report, J. Marine Res., 24, 3, 1966. 
Chen, C. Y. and Durbin, E. G.: Effects of pH on the growth and carbon uptake of marine phytoplankton, Mar. Ecol. Prog. Ser., 109, 83–94, https://doi.org/10.3354/meps109083, 1994. 
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Short summary
This study exposed a natural community to two non-CO2-equilibrated ocean alkalinity enhancement (OAE) deployments using different minerals. Adding alkalinity in this manner decreases dissolved CO2, essential for photosynthesis. While photosynthesis was not suppressed, bloom formation was mildly delayed, potentially impacting marine food webs. The study emphasizes the need for further research on OAE without prior equilibration and on its ecological implications.
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