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Article Dans Une Revue Nature Communications Année : 2019

Revisiting the distribution of oceanic N2 fixation and estimating diazotrophic contribution to marine production

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Marine N 2 fixation supports a significant portion of oceanic primary production by making N 2 bioavailable to planktonic communities, in the process influencing atmosphere-ocean carbon fluxes and our global climate. However, the geographical distribution and controlling factors of marine N 2 fixation remain elusive largely due to sparse observations. Here we present unprecedented high-resolution underway N 2 fixation estimates across over 6000 kilometers of the western North Atlantic. Unexpectedly, we find increasing N 2 fixation rates from the oligotrophic Sargasso Sea to North America coastal waters, driven primarily by cyano-bacterial diazotrophs. N 2 fixation is best correlated to phosphorus availability and chlorophyll-a concentration. Globally, intense N 2 fixation activity in the coastal oceans is validated by a meta-analysis of published observations and we estimate the annual coastal N 2 fixation flux to be 16.7 Tg N. This study broadens the biogeography of N 2 fixation, highlights the interplay of regulating factors, and reveals thriving diazotrophic communities in coastal waters with potential significance to the global nitrogen and carbon cycles.
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hal-02322624 , version 1 (21-10-2019)

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Weiyi Tang, Seaver Wang, Debany Fonseca-Batista, Frank Dehairs, Scott Gifford, et al.. Revisiting the distribution of oceanic N2 fixation and estimating diazotrophic contribution to marine production. Nature Communications, 2019, 10, pp.831. ⟨10.1038/s41467-019-08640-0⟩. ⟨hal-02322624⟩
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