Articles | Volume 15, issue 9
https://doi.org/10.5194/bg-15-2619-2018
https://doi.org/10.5194/bg-15-2619-2018
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, Kelly M. McCabe, Olivier Grosso, Nathalie Leblond, Thierry Moutin, and Sophie Bonnet

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Cited articles

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Aminot, A. and Kerouel, R.: Dosage automatique des nutriments dans les eaux marines: méthodes en flux continu, Ifremer, Plouzanne, France, 2007. 
Berman-Frank, I., Cullen, J. T., Shaked, Y., Sherrell, R. M., and Falkowski, P. G.: Iron availability, cellular iron quotas, and nitrogen fixation in Trichodesmium, Limnol. Oceanogr., 46, 1249–1260, 2001. 
Berthelot, H., Benavides, M., Moisander, P. H., Grosso, O., and Bonnet, S.: High nitrogen fixation rates in the particulate and dissolved pools in the Western Tropical Pacific (Solomon and Bismarck Seas), Geophys. Res. Lett., 44, 8414–8423, 2017. 
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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.
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