Marine N fixation supports a significant portion of oceanic primary production by making N 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 fixation remain elusive largely due to sparse observations. Here we present unprecedented high-resolution underway N fixation estimates across over 6000 kilometers of the western North Atlantic. Unexpectedly, we find increasing N fixation rates from the oligotrophic Sargasso Sea to North America coastal waters, driven primarily by cyanobacterial diazotrophs. N fixation is best correlated to phosphorus availability and chlorophyll-a concentration. Globally, intense N fixation activity in the coastal oceans is validated by a meta-analysis of published observations and we estimate the annual coastal N fixation flux to be 16.7 Tg N. This study broadens the biogeography of N 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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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6381160 | PMC |
| http://dx.doi.org/10.1038/s41467-019-08640-0 | DOI Listing |
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