Bonnet Lab

Development Research Institute (IRD)

Provence-Alpes-Côte d’Azur (FRL) · France

ERC-funded
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ERC Consolidator Grant · 2021

How do diazotrophs shape the ocean biological carbon pump? A global approach, from the single cell to the ecosystem

Diazotrophs regulate marine productivity in 60% of our oceans by alleviating nitrogen limitation, contributing to carbon (C) sequestration through the N2-primed Prokaryotic C Pump (PCP). Yet we don’t know how much diazotroph-derived organic C (OC) is exported to the deep ocean, which prevents robust predictions of how the ocean contributes to CO2 sequestration and climate change mitigation. This knowledge gap is due to the multiple and complex pathways by which diazotrophs are exported to the deep ocean, which quantification and drivers of variability are impossible to capture with current methods. HOPE will bridge this gap thanks to a new isotopic technique I developed and to a coupling…

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