Articles | Volume 19, issue 14
https://doi.org/10.5194/bg-19-3425-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-19-3425-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
20 Jul 2022
Research article |
| 20 Jul 2022
| 20 Jul 2022
Controls on nitrite oxidation in the upper Southern Ocean: insights from winter kinetics experiments in the Indian sector
Mhlangabezi Mdutyana
CORRESPONDING AUTHOR
Department of Oceanography, University of Cape Town, Rondebosch, South Africa
Southern Ocean Carbon and Climate Observatory (SOCCO), CSIR, Rosebank, South Africa
Tanya Marshall
Department of Oceanography, University of Cape Town, Rondebosch, South Africa
Department of Geosciences, Princeton University, Princeton, New
Jersey, USA
Department of Ecology and Evolutionary Biology, Yale University, New
Haven, Connecticut, USA
Jessica M. Burger
Department of Oceanography, University of Cape Town, Rondebosch, South Africa
Sandy J. Thomalla
Southern Ocean Carbon and Climate Observatory (SOCCO), CSIR, Rosebank, South Africa
Bess B. Ward
Department of Geosciences, Princeton University, Princeton, New
Jersey, USA
Sarah E. Fawcett
Department of Oceanography, University of Cape Town, Rondebosch, South Africa
Marine and Antarctic Research centre for Innovation and Sustainability (MARIS), University of Cape Town, Rondebosch, Cape Town, South Africa
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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.
Nitrite-oxidizing bacteria in the winter Southern Ocean show a high affinity for nitrite but...
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