Articles | Volume 19, issue 14
Biogeosciences, 19, 3425–3444, 2022
https://doi.org/10.5194/bg-19-3425-2022
Biogeosciences, 19, 3425–3444, 2022
https://doi.org/10.5194/bg-19-3425-2022
Research article
20 Jul 2022
Research article | 20 Jul 2022

Controls on nitrite oxidation in the upper Southern Ocean: insights from winter kinetics experiments in the Indian sector

Mhlangabezi Mdutyana et al.

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Cited articles

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Baer, S. E., Connelly, T. L., Sipler, R. E., Yager, P. L., and Bronk, D. A.: Effect of temperature on rates of ammonium uptake and nitrification in the western coastal Arctic during winter, spring, and summer, Global Biogeochem. Cy., 28, 1455–1466, https://doi.org/10.1111/1462-2920.13280, 2014. 
Bayer, B., Saito, M. A., McIlvin, M. R., Lücker, S., Moran, D. M., Lankiewicz, T. S., Dupont, C. L., and Santoro, A. E.: Metabolic versatility of the nitrite-oxidizing bacterium Nitrospira marina and its proteomic response to oxygen-limited conditions, ISME J., 15, 1025–1039, https://doi.org/10.1038/s41396-020-00828-3, 2021. 
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Short summary
Nitrite-oxidizing bacteria in the winter Southern Ocean show a high affinity for nitrite but require a minimum (i.e., "threshold") concentration before they increase their rates of nitrite oxidation significantly. The classic Michaelis–Menten model thus cannot be used to derive the kinetic parameters, so a modified equation was employed that also yields the threshold nitrite concentration. Dissolved iron availability may play an important role in limiting nitrite oxidation.
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