What question did this study set out to answer?

To evaluate how ocean alkalinity enhancement affects silica ballasting and carbon export during phytoplankton blooms.

July 10, 2026BiogeosciencesOpen Access

Ocean alkalinity enhancement reduces silica ballasting during export due to amplified dissolution

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To evaluate how ocean alkalinity enhancement affects silica ballasting and carbon export during phytoplankton blooms.
Utilized mesocosms in the North Sea to test six alkalinity levels over 39 days
Measured phytoplankton biomass, silica-to-carbon ratios, and sinking particle dynamics
Assessed variations under two dilution scenarios (localized vs. uniform OAE)
Silica ballasting ratios decreased by up to 50% under higher pH conditions, affecting carbon export efficiency
Exported biogenic silica to particulate organic carbon ratios dropped by 60% during heightened alkalinity
No significant changes in organic matter remineralization or particle sinking velocities were observed.

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Implication

Randomized trial examines silica ballasting effects from alkaline adjustments in ocean ecosystems, suggesting reduced carbon sequestration effectiveness.

Cite This Study

Suessle et al. (2026) studied this question.

synapsesocial.com/papers/6a508bde6eeac72a437a056f https://doi.org/10.5194/bg-23-4691-2026

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Implication

Randomized trial examines silica ballasting effects from alkaline adjustments in ocean ecosystems, suggesting reduced carbon sequestration effectiveness.

Ocean alkalinity enhancement reduces silica ballasting during export due to amplified dissolution

Key Points

Discussion

Implication

Cite This Study

Ocean alkalinity enhancement reduces silica ballasting during export due to amplified dissolution

Key Points

Discussion

Implication

Cite This Study

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