| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Revisiting the distribution of oceanic N-2 fixation and estimating diazotrophic contribution to marine production
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| Autores: |
Tang, Weiyi
Wang, Seaver
Fonseca-batista, Debany
Dehairs, Frank
Gifford, Scott
Gonzalez, Aridane G.
Gallinari, Morgane
Planquette, Helene
Sarthou, Geraldine
Cassar, Nicolas
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| Data: |
2019-02
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| Ano: |
2019
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| Resumo: |
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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00484/59564/62548.pdf
https://archimer.ifremer.fr/doc/00484/59564/62549.pdf
https://archimer.ifremer.fr/doc/00484/59564/62550.pdf
https://archimer.ifremer.fr/doc/00484/59564/62551.pdf
https://archimer.ifremer.fr/doc/00484/59564/62552.xlsx
DOI:10.1038/s41467-019-08640-0
https://archimer.ifremer.fr/doc/00484/59564/
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| Editor: |
Nature Publishing Group
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| Formato: |
application/pdf
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| Fonte: |
Nature Communications (2041-1723) (Nature Publishing Group), 2019-02 , Vol. 10 , N. 831 , P. 10p.
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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