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Biogeosciences An interactive open-access journal of the European Geosciences Union
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BG | Volume 15, issue 9
Biogeosciences, 15, 2619–2628, 2018
https://doi.org/10.5194/bg-15-2619-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Interactions between planktonic organisms and biogeochemical...

Biogeosciences, 15, 2619–2628, 2018
https://doi.org/10.5194/bg-15-2619-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 May 2018

Research article | 04 May 2018

Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets

Angela N. Knapp et al.

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Short summary
The spatial distribution of biological N2 fixation fluxes to the ocean remains poorly constrained. Here we use nitrogen isotope budgets to identify significant N2 fixation inputs to the western tropical South Pacific (WTSP), where N2 fixation supports > 50 % of export production at stations proximal to iron sources. The significant N2 fixation inputs in the WTSP may offset nitrogen loss in the oxygen-deficient zones of the eastern tropical South Pacific.
The spatial distribution of biological N2 fixation fluxes to the ocean remains poorly...
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