AI Summary

The biological carbon pump transports organic carbon from the ocean surface to the seafloor, where it can remain for hundreds or thousands of years, making it a key oceanic carbon sink. Researchers had long believed that larger phytoplankton were more effective at exporting carbon to depth than tiny cyanobacteria. Recent work by Jingjing Zhang and colleagues, published in AGU Advances, challenges that assumption, suggesting cyanobacteria may play a larger role in deep‑water carbon sequestration than previously thought.

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