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Recent studies demonstrate that marine N2 fixation can be carried out without light. However, direct measurements of N2 fixation in dark environments are relatively scarce. This study uses a model that represents biogeochemical cycles at a deep-ocean location in the Gulf of Aqaba (Red Sea). Different model versions are used to test assumptions about N2 fixers. Relaxing light limitation for marine N2 fixers improved the similarity between model results and observations of deep nitrate and oxygen.
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BG | Articles | Volume 15, issue 24
Biogeosciences, 15, 7379–7401, 2018
https://doi.org/10.5194/bg-15-7379-2018
Biogeosciences, 15, 7379–7401, 2018
https://doi.org/10.5194/bg-15-7379-2018

Research article 14 Dec 2018

Research article | 14 Dec 2018

Modelling the biogeochemical effects of heterotrophic and autotrophic N2 fixation in the Gulf of Aqaba (Israel), Red Sea

Angela M. Kuhn et al.

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Cited articles

Al-Najjar, T., Badran, M. I., Richter, C., Meyerhoefer, M., and Sommer, U.: Seasonal dynamics of phytoplankton in the Gulf of Aqaba, Red Sea, Hydrobiologia, 579, 69–83, 2007. 
Amon, R. M. W. and Benner, R.: Photochemical and microbial consumption of dissolved organic carbon and dissolved oxygen in the Amazon River system, Geochim. Cosmochim. Ac., 60, 1783–1792, 1996. 
Badran, M. I., Rasheed, M., Manasrah, R., and Al-Najjar, T.: Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea, Oceanologia, 47, 47–60, 2005. 
Benavides, M., Berthelot, H., Duhamel, S., Raimbault, P., and Bonnet, S.: Dissolved organic matter uptake by Trichodesmium in the Southwest Pacific, Sci. Rep., 7, 41315, https://doi.org/10.1038/srep41315, 2017. 
Benavides, M., Bonnet, S., Berman-Frank, I., and Riemann, L.: Deep Into Oceanic N2 Fixation, Front. Mar. Sci., 5, 1–4, https://doi.org/10.3389/fmars.2018.00108, 2018. 
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Short summary
Recent studies demonstrate that marine N2 fixation can be carried out without light. However, direct measurements of N2 fixation in dark environments are relatively scarce. This study uses a model that represents biogeochemical cycles at a deep-ocean location in the Gulf of Aqaba (Red Sea). Different model versions are used to test assumptions about N2 fixers. Relaxing light limitation for marine N2 fixers improved the similarity between model results and observations of deep nitrate and oxygen.
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