Nutrient distribution and nitrogen and oxygen isotopic composition of nitrate in water masses of the subtropical southern Indian Ocean

Harms, Natalie C.; Lahajnar, Niko; Gaye, Birgit; Rixen, Tim; Dähnke, Kirstin; Ankele, Markus; Schwarz-Schampera, Ulrich; Emeis, Kay-Christian

doi:https://doi.org/10.5194/bg-16-2715-2019

Articles | Volume 16, issue 13

https://doi.org/10.5194/bg-16-2715-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-16-2715-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 13

Research article

|

12 Jul 2019

Research article |

| 12 Jul 2019

Nutrient distribution and nitrogen and oxygen isotopic composition of nitrate in water masses of the subtropical southern Indian Ocean

Natalie C. Harms, Niko Lahajnar, Birgit Gaye, Tim Rixen, Kirstin Dähnke, Markus Ankele, Ulrich Schwarz-Schampera, and Kay-Christian Emeis

Supplement

https://doi.org/10.5194/bg-16-2715-2019-supplement

Data sets

Physical oceanography, nutrients, and nitrogen and oxygen isotopic composition of nitrate measured on water bottle samples during Maria S. Merian cruise MSM59/2 N. Harms, N. Lahajnar, B. Gaye, T. Rixen, K. Dähnke, M. Ankele, U. Schwarz-Schampera, and K.-C. Emeis https://doi.pangaea.de/10.1594/PANGAEA.897503

Physical oceanography, nutrients, and nitrogen and oxygen isotopic composition of nitrate measured on water bottle samples during SONNE cruise SO259 N. Harms, N. Lahajnar, B. Gaye, T. Rixen, K. Dähnke, M. Ankele, U. Schwarz-Schampera, and K.-C. Emeis https://doi.pangaea.de/10.1594/PANGAEA.897504

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Short summary

The Indian Ocean subtropical gyre is a large oligotrophic area that is likely to adjust to continued warming by increasing stratification, reduced nutrient supply and decreasing biological production. In this study, we investigated concentrations of nutrients and stable isotopes of nitrate. We determine the lateral influence of water masses entering the gyre from the northern Indian Ocean and from the Southern Ocean and quantify the input of nitrogen by N₂ fixation into the surface layer.