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.
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.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Jul 2019
Research article |
| 12 Jul 2019
| 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
CORRESPONDING AUTHOR
Institute for Geology, Universität Hamburg, Hamburg, 20146,
Germany
Niko Lahajnar
Institute for Geology, Universität Hamburg, Hamburg, 20146,
Germany
Birgit Gaye
Institute for Geology, Universität Hamburg, Hamburg, 20146,
Germany
Tim Rixen
Institute for Geology, Universität Hamburg, Hamburg, 20146,
Germany
Leibniz Centre for Tropical Marine Research, Bremen, 28359, Germany
Kirstin Dähnke
Helmholtz-Zentrum Geesthacht (HZG), Institute for Coastal Research,
Geesthacht, 21502, Germany
Markus Ankele
Helmholtz-Zentrum Geesthacht (HZG), Institute for Coastal Research,
Geesthacht, 21502, Germany
Ulrich Schwarz-Schampera
Federal Institute for Geosciences and Natural Resources (BGR),
Hannover, 30655, Germany
Kay-Christian Emeis
Institute for Geology, Universität Hamburg, Hamburg, 20146,
Germany
Helmholtz-Zentrum Geesthacht (HZG), Institute for Coastal Research,
Geesthacht, 21502, Germany
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Cited
29 citations as recorded by crossref.
- Source apportionment of nitrate in the Pearl River Estuary using δ15N and δ18O values and isotope mixing model R. Long et al. 10.1016/j.marpolbul.2023.114962
- Measurements and analysis of nitrogen and phosphorus in oceans: Practice, frontiers, and insights H. Siriwardana et al. 10.1016/j.heliyon.2024.e28182
- Effects of photosymbiosis and related processes on planktic foraminifera-bound nitrogen isotopes in South Atlantic sediments A. Auderset et al. 10.5194/bg-22-1887-2025
- Updated temperature correction for computing seawater nitrate with in situ ultraviolet spectrophotometer and submersible ultraviolet nitrate analyzer nitrate sensors J. Plant et al. 10.1002/lom3.10566
- Natural groundwater nutrient fluxes exceed anthropogenic inputs in an ecologically impacted estuary: lessons learned from Mobile Bay, Alabama D. Montiel et al. 10.1007/s10533-019-00587-0
- Oxygen and Nutrient Trapping in the Southern Benguela Upwelling System T. Rixen et al. 10.3389/fmars.2021.730591
- Nitrogen isotopic analysis of nitrate in aquatic environment using cadmium–hydroxylamine hydrochloride reduction J. Jin et al. 10.1002/rcm.8804
- Reactive Nitrogen Cycling in the Atmosphere and Ocean K. Altieri et al. 10.1146/annurev-earth-083120-052147
- The potential contribution of microbial communities to carbon fixation and nitrogen cycle in the Eastern Indian Ocean C. Ding & J. Sun 10.1016/j.marenvres.2025.107056
- Geomorphology and oceanography of central-eastern Indian Ocean seamounts T. O'Hara 10.1016/j.dsr2.2024.105415
- Development of standards for assessing water quality in marine coastal waters of Bahrain S. Painting et al. 10.1016/j.marpolbul.2023.115560
- Marine Water Quality at Diego Garcia: A Preliminary Study of Pollution Levels in Coastal and Lagoon Waters S. Painting et al. 10.3389/fmars.2021.671319
- Variable ventilation ages in the equatorial Indian Ocean thermocline during the LGM J. Raddatz et al. 10.1038/s41598-023-38388-z
- Sediment trap-derived particulate matter fluxes in the oligotrophic subtropical gyre of the South Indian Ocean N. Harms et al. 10.1016/j.dsr2.2020.104924
- Characterizing the stable oxygen isotopic composition of the southeast Indian Ocean R. Glaubke et al. 10.1016/j.marchem.2024.104397
- What can we learn from amino acids about oceanic organic matter cycling and degradation? B. Gaye et al. 10.5194/bg-19-807-2022
- High genomic connectivity within Anatoma at hydrothermal vents along the Central and Southeast Indian Ridge K. Kniesz et al. 10.1038/s41598-025-85507-z
- Diazotrophy in the Indian Ocean: Current understanding and future perspectives S. Chowdhury et al. 10.1002/lol2.10343
- Seasonal enhancement of phytoplankton biomass in the southern tropical Indian Ocean: Significance of meteorological and oceanography parameters C. Karnan & S. Gautham 10.1016/j.oceano.2023.10.003
- Oxygen isotope composition of seawater and salinity in the western Indian Ocean: Implications for water mass mixing Y. Kim et al. 10.1016/j.marchem.2021.104035
- Distribution and biogeochemical perspectives of nutrients in the Eastern Equatorial Indian Ocean M. Paul et al. 10.1016/j.oceano.2024.02.005
- Dissolved selenium in the Northeastern Indian Ocean J. Zhang et al. 10.1016/j.dsr.2025.104459
- Megafauna of the German exploration licence area for seafloor massive sulphides along the Central and South East Indian Ridge (Indian Ocean) K. Gerdes et al. 10.3897/BDJ.9.e69955
- Recent changes in the upper oceanic water masses over the Indian Ocean using Argo data A. Shee et al. 10.1038/s41598-023-47658-9
- A 70 kyr Record of Monsoon-induced Marine Productivity Changes, Terrigenous Flux and Weathering Variations in the Southern Bay of Bengal B. Banerjee et al. 10.17491/jgsi/2024/172982
- Spatial Distribution of Nutrient in The Waters of Haruku Strait, Central Maluku Regency, Maluku Province S. Tubalawony et al. 10.30736/grouper.v15i1.225
- The Agulhas Current Transports Signals of Local and Remote Indian Ocean Nitrogen Cycling T. Marshall et al. 10.1029/2022JC019413
- Dissolved organic carbon contribution to oxygen respiration in the central Red Sea M. Calleja et al. 10.1038/s41598-019-40753-w
- Instabilities Across the Agulhas Current Enhance Upward Nitrate Supply in the Southwest Subtropical Indian Ocean T. Marshall et al. 10.1029/2023AV000973
26 citations as recorded by crossref.
- Source apportionment of nitrate in the Pearl River Estuary using δ15N and δ18O values and isotope mixing model R. Long et al. 10.1016/j.marpolbul.2023.114962
- Measurements and analysis of nitrogen and phosphorus in oceans: Practice, frontiers, and insights H. Siriwardana et al. 10.1016/j.heliyon.2024.e28182
- Effects of photosymbiosis and related processes on planktic foraminifera-bound nitrogen isotopes in South Atlantic sediments A. Auderset et al. 10.5194/bg-22-1887-2025
- Updated temperature correction for computing seawater nitrate with in situ ultraviolet spectrophotometer and submersible ultraviolet nitrate analyzer nitrate sensors J. Plant et al. 10.1002/lom3.10566
- Natural groundwater nutrient fluxes exceed anthropogenic inputs in an ecologically impacted estuary: lessons learned from Mobile Bay, Alabama D. Montiel et al. 10.1007/s10533-019-00587-0
- Oxygen and Nutrient Trapping in the Southern Benguela Upwelling System T. Rixen et al. 10.3389/fmars.2021.730591
- Nitrogen isotopic analysis of nitrate in aquatic environment using cadmium–hydroxylamine hydrochloride reduction J. Jin et al. 10.1002/rcm.8804
- Reactive Nitrogen Cycling in the Atmosphere and Ocean K. Altieri et al. 10.1146/annurev-earth-083120-052147
- The potential contribution of microbial communities to carbon fixation and nitrogen cycle in the Eastern Indian Ocean C. Ding & J. Sun 10.1016/j.marenvres.2025.107056
- Geomorphology and oceanography of central-eastern Indian Ocean seamounts T. O'Hara 10.1016/j.dsr2.2024.105415
- Development of standards for assessing water quality in marine coastal waters of Bahrain S. Painting et al. 10.1016/j.marpolbul.2023.115560
- Marine Water Quality at Diego Garcia: A Preliminary Study of Pollution Levels in Coastal and Lagoon Waters S. Painting et al. 10.3389/fmars.2021.671319
- Variable ventilation ages in the equatorial Indian Ocean thermocline during the LGM J. Raddatz et al. 10.1038/s41598-023-38388-z
- Sediment trap-derived particulate matter fluxes in the oligotrophic subtropical gyre of the South Indian Ocean N. Harms et al. 10.1016/j.dsr2.2020.104924
- Characterizing the stable oxygen isotopic composition of the southeast Indian Ocean R. Glaubke et al. 10.1016/j.marchem.2024.104397
- What can we learn from amino acids about oceanic organic matter cycling and degradation? B. Gaye et al. 10.5194/bg-19-807-2022
- High genomic connectivity within Anatoma at hydrothermal vents along the Central and Southeast Indian Ridge K. Kniesz et al. 10.1038/s41598-025-85507-z
- Diazotrophy in the Indian Ocean: Current understanding and future perspectives S. Chowdhury et al. 10.1002/lol2.10343
- Seasonal enhancement of phytoplankton biomass in the southern tropical Indian Ocean: Significance of meteorological and oceanography parameters C. Karnan & S. Gautham 10.1016/j.oceano.2023.10.003
- Oxygen isotope composition of seawater and salinity in the western Indian Ocean: Implications for water mass mixing Y. Kim et al. 10.1016/j.marchem.2021.104035
- Distribution and biogeochemical perspectives of nutrients in the Eastern Equatorial Indian Ocean M. Paul et al. 10.1016/j.oceano.2024.02.005
- Dissolved selenium in the Northeastern Indian Ocean J. Zhang et al. 10.1016/j.dsr.2025.104459
- Megafauna of the German exploration licence area for seafloor massive sulphides along the Central and South East Indian Ridge (Indian Ocean) K. Gerdes et al. 10.3897/BDJ.9.e69955
- Recent changes in the upper oceanic water masses over the Indian Ocean using Argo data A. Shee et al. 10.1038/s41598-023-47658-9
- A 70 kyr Record of Monsoon-induced Marine Productivity Changes, Terrigenous Flux and Weathering Variations in the Southern Bay of Bengal B. Banerjee et al. 10.17491/jgsi/2024/172982
- Spatial Distribution of Nutrient in The Waters of Haruku Strait, Central Maluku Regency, Maluku Province S. Tubalawony et al. 10.30736/grouper.v15i1.225
3 citations as recorded by crossref.
- The Agulhas Current Transports Signals of Local and Remote Indian Ocean Nitrogen Cycling T. Marshall et al. 10.1029/2022JC019413
- Dissolved organic carbon contribution to oxygen respiration in the central Red Sea M. Calleja et al. 10.1038/s41598-019-40753-w
- Instabilities Across the Agulhas Current Enhance Upward Nitrate Supply in the Southwest Subtropical Indian Ocean T. Marshall et al. 10.1029/2023AV000973
Latest update: 17 May 2025
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.
The Indian Ocean subtropical gyre is a large oligotrophic area that is likely to adjust to...
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