Articles | Volume 16, issue 13
https://doi.org/10.5194/bg-16-2617-2019
© 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-16-2617-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Global trends in marine nitrate N isotopes from observations and a neural network-based climatology
Department of Earth System Science, University of California, Irvine, CA, USA
Aaron Bagnell
Department of Geography, University of California, Santa Barbara, CA, USA
Dario Marconi
Department of Geosciences, Princeton University, Princeton, NJ, USA
Timothy DeVries
Department of Geography, University of California, Santa Barbara, CA, USA
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- Decadal oscillations in the ocean’s largest oxygen-deficient zone N. Duprey et al. https://doi.org/10.1126/science.adk4965
- Nitrogen uptakes dynamics with environmental variables in the southwest Bay of Bengal K. Priyanka et al. https://doi.org/10.1016/j.qsa.2024.100213
- Distribution models of deep-sea elasmobranchs in the Azores, Mid-Atlantic Ridge, to inform spatial planning D. Das et al. https://doi.org/10.1016/j.dsr.2022.103707
- Causes and climatic influence of centennial-scale denitrification variability in the southeastern Arabian Sea since the last glacial period S. Nagoji & M. Tiwari https://doi.org/10.1017/qua.2020.118
- Constraining nitrogen sources to a seagrass-dominated coastal embayment by using an isotope mass balance approach D. Russell et al. https://doi.org/10.1071/MF21320
- Green Sea Turtle Recruitment in the Eastern North Pacific: Patterns Identified Using Geochemical Signatures in Bones C. Turner Tomaszewicz et al. https://doi.org/10.1002/ece3.72482
33 citations as recorded by crossref.
- Exploring the Effects of Residence Time on the Utility of Stable Isotopes and S/C Ratios as Proxies for Ocean Connectivity E. Stüeken et al. https://doi.org/10.1021/acsearthspacechem.3c00018
- Significant Southern Hemisphere contribution to the Indonesian Throughflow over the last 800,000 years M. Kienast et al. https://doi.org/10.1038/s41467-026-71786-1
- The broadsword and the beasts: large nektonic prey are crucial for the swordfish (Xiphias gladius) but diverse micronektonic species dominate its diet in the Indian Ocean E. Romanov et al. https://doi.org/10.1071/MF25129
- Impact of intensifying nitrogen limitation on ocean net primary production is fingerprinted by nitrogen isotopes P. Buchanan et al. https://doi.org/10.1038/s41467-021-26552-w
- Oceanographic and biogeochemical drivers cause divergent trends in the nitrogen isoscape in a changing Arctic Ocean P. Buchanan et al. https://doi.org/10.1007/s13280-021-01635-6
- Trophic ecology of juvenile smooth hammerhead shark Sphyrna zygaena (Carcharhiniformes: Sphyrnidae) in the central Gulf of California, Mexico M. Vázquez-Liñero et al. https://doi.org/10.1007/s10641-024-01665-5
- Modelling global mesozooplankton biomass using machine learning K. Liu et al. https://doi.org/10.1016/j.pocean.2024.103371
- Isotopic Constraints on Nitrate Cycling in the Yellow Sea: Seasonal and Regional Patterns S. Jeong et al. https://doi.org/10.1007/s12601-025-00228-8
- Southern Ocean sourced waters modulate Eastern Equatorial Pacific denitrification during the Mid-Pleistocene transition P. Diz & M. Pérez-Arlucea https://doi.org/10.1016/j.palaeo.2021.110531
- Past trajectory of a Northwest Europe socio-ecosystem at the land-sea interface: Case study of the northern watersheds of the Bay of Brest over the last 150 years C. Valero et al. https://doi.org/10.1016/j.palaeo.2026.113703
- Constraining the Global Ocean Cu Cycle With a Data‐Assimilated Diagnostic Model S. Roshan et al. https://doi.org/10.1029/2020GB006741
- Sources and Cycling of Particulate Organic Matter in Baffin Bay: A Multi-Isotope δ13C, δ15N, and Δ14C Approach A. Fox & B. Walker https://doi.org/10.3389/fmars.2022.846025
- Trophic niche variation across the pan-Arctic coastal continuum N. McTigue et al. https://doi.org/10.1371/journal.pone.0335406
- Barium in seawater: dissolved distribution, relationship to silicon, and barite saturation state determined using machine learning Ö. Mete et al. https://doi.org/10.5194/essd-15-4023-2023
- Data-Driven Modeling of Dissolved Iron in the Global Ocean Y. Huang et al. https://doi.org/10.3389/fmars.2022.837183
- Using geostatistical analysis for simultaneous estimation of isoscapes and ontogenetic shifts in isotope ratios of highly migratory marine fish J. Matsubayashi et al. https://doi.org/10.3389/fmars.2022.1049056
- Global ocean dimethyl sulfide climatology estimated from observations and an artificial neural network W. Wang et al. https://doi.org/10.5194/bg-17-5335-2020
- Mapping the global distribution of lead and its isotopes in seawater with explainable machine learning A. Olivelli et al. https://doi.org/10.5194/essd-17-3679-2025
- Integrating Bayesian methods with neural networks for enhanced climatology models C. Awasthi et al. https://doi.org/10.1088/1402-4896/adf51f
- Modeling the global ocean distribution of dissolved cadmium based on machine learning—SHAP algorithm Z. Jiang et al. https://doi.org/10.1016/j.scitotenv.2024.177951
- Nitrogen cycling during the Mesoproterozoic as informed by the 1400 million year old Xiamaling Formation X. Wang et al. https://doi.org/10.1016/j.earscirev.2023.104499
- Tropical decadal variability in nutrient supply and phytoplankton community in the Central Equatorial Pacific during the late Holocene T. Guilderson et al. https://doi.org/10.1038/s41598-024-54635-3
- Assessment of C, N, and Si Isotopes as Tracers of Past Ocean Nutrient and Carbon Cycling J. Farmer et al. https://doi.org/10.1029/2020GB006775
- Fine‐scale reconstruction of pelagic fish migration by iso‐logging of eye lens J. Matsubayashi et al. https://doi.org/10.1111/2041-210x.70201
- Equatorial Pacific bulk sediment δ15N supports a secular increase in Southern Ocean nitrate utilization after the mid-Pleistocene Transition J. Lambert et al. https://doi.org/10.1016/j.quascirev.2021.107348
- Particulate Organic Matter in the Atacama Trench: Tracing Sources and Possible Transport Mechanisms to the Hadal Seafloor E. Flores et al. https://doi.org/10.1029/2023JG007401
- Trophic sources and pathways of mesozooplankton and fish larvae in the Kuroshio and its neighboring waters based on stable isotope ratios of carbon and nitrogen T. Kobari et al. https://doi.org/10.1016/j.pocean.2022.102952
- Decadal oscillations in the ocean’s largest oxygen-deficient zone N. Duprey et al. https://doi.org/10.1126/science.adk4965
- Nitrogen uptakes dynamics with environmental variables in the southwest Bay of Bengal K. Priyanka et al. https://doi.org/10.1016/j.qsa.2024.100213
- Distribution models of deep-sea elasmobranchs in the Azores, Mid-Atlantic Ridge, to inform spatial planning D. Das et al. https://doi.org/10.1016/j.dsr.2022.103707
- Causes and climatic influence of centennial-scale denitrification variability in the southeastern Arabian Sea since the last glacial period S. Nagoji & M. Tiwari https://doi.org/10.1017/qua.2020.118
- Constraining nitrogen sources to a seagrass-dominated coastal embayment by using an isotope mass balance approach D. Russell et al. https://doi.org/10.1071/MF21320
- Green Sea Turtle Recruitment in the Eastern North Pacific: Patterns Identified Using Geochemical Signatures in Bones C. Turner Tomaszewicz et al. https://doi.org/10.1002/ece3.72482
Saved (final revised paper)
Latest update: 09 Jun 2026
Short summary
The N isotopic composition of nitrate (
nitrate δ15N) is a useful tracer of ocean N cycling and many other ocean processes. Here, we use a global compilation of marine nitrate δ15N as an input, training, and validating dataset for an artificial neural network (a.k.a.,
machine learning) and examine basin-scale trends in marine nitrate δ15N from the surface to the seafloor.
The N isotopic composition of nitrate (
nitrate δ15N) is a useful tracer of ocean N cycling and...
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