Articles | Volume 12, issue 4
Biogeosciences, 12, 1113–1130, 2015
Biogeosciences, 12, 1113–1130, 2015
Research article
24 Feb 2015
Research article | 24 Feb 2015

What prevents nitrogen depletion in the oxygen minimum zone of the eastern tropical South Pacific?

B. Su et al.

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Cited articles

Anderson, L. A. and Sarmiento, J. L.: Redfield ratios of remineralization determined by nutrient data analysis, Global Biogeochem. Cy., 8, 65–80,, 1994.
Bethoux, J. P.: Oxygen consumption, new production, vertical advection and environmental evolution in the Mediterranean Sea, Deep-Sea Res., 36, 769–781,, 1989.
Bianchi, D, Dunne,J. P., Sarmiento, J. L. and Galbraith,E. D.: Data-based estimates of suboxia, denitrification, and N2O production in the ocean and their sensitivities to dissolved O2, Global Biogeochem. Cy., 26,1–13,, 2012.
Breitbarth, E, Oschlies, A. and LaRoche, J.: Physiological constrains on the global distribution of Trichodesmium-effect of temperature on diazotropy, Biogeosciences, 4, 53–61,, 2007.
Bulow, S. E., Rich, J. J., Naik, H. S., Pratihary, A. K., and Ward, B. B.: Denitrification exceeds anammox as a nitrogen loss pathway in the Arabian Sea oxygen minimum zone, Deep-Sea Res. Pt. I, 57, 384–393,, 2010.
Short summary
A box model of the eastern tropical South Pacific oxygen minimum zone suggests that anaerobic water-column remineralization rates have to be slower than aerobic remineralization in order to explain the relatively high values of observed nitrate concentrations. Lateral oxygen supply sufficient to oxidize about one-fifth of the export production is required to prevent an anoxic deep ocean. Under these circumstances, the region can be a net source of fixed nitrogen to the surrounding ocean.
Final-revised paper