Articles | Volume 16, issue 13
https://doi.org/10.5194/bg-16-2617-2019
https://doi.org/10.5194/bg-16-2617-2019
Research article
 | 
05 Jul 2019
Research article |  | 05 Jul 2019

Global trends in marine nitrate N isotopes from observations and a neural network-based climatology

Patrick A. Rafter, Aaron Bagnell, Dario Marconi, and Timothy DeVries

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Cited articles

Altabet, M. A.: Constraints on oceanic N balance/imbalance from sedimentary 15N records, Biogeosciences, 4, 75–86, https://doi.org/10.5194/bg-4-75-2007, 2007. 
Altabet, M. A. and Francois, R.: Sedimentary nitrogen isotopic ratio as a recorder for surface ocean nitrate utilization, Global Biogeochem. Cy., 8, 103–116, 1994a. 
Altabet, M. A. and Francois, R.: The use of nitrogen isotopic ratio for reconstruction of past changes in surface ocean nutrient utilization, in Carbon Cycling in the Glacial Ocean: Constraints on the Ocean's Role in Global Change, Vol. 117, 281–306, Springer-Verlag Berlin Heidelberg, 1994b. 
Altabet, M. A. and Francois, R.: Nitrogen isotope biogeochemistry of the antarctic polar frontal zone at 170 W, Deep-Sea Res. Pt. II, 48, 4247–4273, 2001. 
Altabet, M. A., Murray, D. W., and Prell, W. L.: Climatically linked oscillations in Arabian Sea denitrification over the past 1 m.y.: Implications for the marine N cycle, Paleoceanography, 14, 732–743, 1999. 
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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.
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