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Title: Revisiting the distribution of oceanic N-2 fixation and estimating diazotrophic contribution to marine production
Authors: Tang, Weiyi
Wang, Seaver
Fonseca-Batista, Debany
Dehairs, Frank
Gifford, Scott
Gonzalez, Aridane G. 
Gallinari, Morgane
Planquette, Helene
Sarthou, Geraldine
Cassar, Nicolas
UNESCO Clasification: 251002 Oceanografía química
Keywords: Atlantic Time-Series
Carbon-Cycle, et al
Issue Date: 2019
Journal: Nature Communications 
Abstract: 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 cyanobacterial diazotrophs. N-2 fixation is best correlated to phosphorus availability and chlorophylla 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.
ISSN: 2041-1723
DOI: 10.1038/s41467-019-08640-0
Source: Nature Communications [ISSN 2041-1723], v. 10 (831)
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