Biogeosciences
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Articles | Volume 23, issue 17
Articles | Volume 23, issue 17
https://doi.org/10.5194/bg-23-6229-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-6229-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 17
Research article
 | 
11 Sep 2026
Research article |  | 11 Sep 2026

Sinking particle fluxes and biological carbon pump efficiency in the Labrador Sea during a Phaeocystis bloom decline

Montserrat Roca-Martí, Madeline Healey, Colleen E. McBride, Rachel Sipler, Emmanuel Devred, Carolina Cisternas-Novoa, Elisa Romanelli, Kyoko Ohashi, and Stephanie S. Kienast

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Short summary
We studied a historically large spring phytoplankton bloom in the Labrador Sea to quantify how much carbon reaches the deep ocean. Despite high productivity, only a small fraction of organic carbon sank below the ocean's productive layer, suggesting a limited role of the dominant phytoplankton species (Phaeocystis) in carbon export. Our findings highlight the need for long-term observations to better assess the ocean’s role in carbon sequestration.
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