Data/hora: 07/06/2024 04:59:17

Provedor de dados: | 5
País: | France
Título: | Revisiting the distribution of oceanic N-2 fixation and estimating diazotrophic contribution to marine production
Autores: | Tang, Weiyi; Wang, Seaver; Fonseca-batista, Debany; Dehairs, Frank; Gifford, Scott; Gonzalez, Aridane G.; Gallinari, Morgane; Planquette, Helene; Sarthou, Geraldine; Cassar, Nicolas.
Data: | 2019-02
Ano: | 2019
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.
Tipo: | Text
Idioma: | Inglês

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/

Editor: | Nature Publishing Group
Formato: | application/pdf
Fonte: | Nature Communications (2041-1723) (Nature Publishing Group), 2019-02 , Vol. 10 , N. 831 , P. 10p.

Fonte:

info:eu-repo/semantics/openAccess

restricted use