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Sedimentary nitrogen isotopic ratio as a recorder for surface ocean nitrate utilization

Altabet, Mark A., Francois, Roger·1994·Global Biogeochemical Cycles

DOI 10.1029/93gb03396

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Abstract

In two contrasting regions of the ocean, the equatorial Pacific and the southern ocean, the δ 15 N of core top sediments were strongly related to [NO 3 − ] in surface waters. With distance from the equator in the equatorial Pacific, δ 15 N increased from 7‰ to 16‰ as [NO 3 − ] decreased from 8μM to < 0.1 μM. Going from 60° to 30° S in the SE Indian Ocean, core top δ 15 N increased from 5‰ to 11‰ as surface [NO 3 − ] decreased from 25μM to < 0.1 μM. These results are strong evidence that sedimentary δ 15 N in these regions is recording the increasing isotopic enrichment of near‐surface NO 3 − with its depletion by phytoplankton. In the case of the equatorial Pacific, δ 15 N values for sinking particles collected at 150 m matched well the core top sediment values, demonstrating little diagenetic alteration of the near‐surface generated isotopic signal. These equatorial Pacific data sets have variations with near‐surface [NO 3 − ] consistent with Rayleigh fractionation kinetics for a fractionation factor (ϵ u ) of 2.5‰. This value is substantially lower than previously found for temperate or polar regions, perhaps as a result of differences in phytoplankton species assemblage or growth condition. In the southern ocean south of the polar front, comparison of δ 15 N values for opal‐rich sediments south and sinking particles indicates an apparent +5‰ diagenetic enrichment relative to the surface‐generated signal that requires further investigation. This exception aside, our observations show that the surface‐water relationship of increasing δ 15 N with increasing NO 3 − depletion is generally transmitted to and preserved in the sediments, an important requirement for further development and application of this important paleoceanographic tool.

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Isotopic evidence of dissolved organic nitrogen production and consumption in ocean surface waters
Ryu, Y., Marconi, D., Liang, Z., Knapp, A. N., Fripiat, F., Fawcett, S. E., Rafter, P. A., Oleynik, S., Martínez‐García, A., Haug, G. H., et al. (2026) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2530315123

Authors: Altabet, M. A., & Francois, R.
ORCID: Altabet, Mark A.
Venue: Global Biogeochemical Cycles
Publisher: American Geophysical Union (AGU)
Published: 1994-03
Volume: 8
Issue: 1
Pages: 103-116
ISSN: 0886-6236 (ISSN-L)
1944-9224
DOI: 10.1029/93gb03396
OpenAlex: W2030125283
Cited by: 792
References: 50
Citations by year: 2026: 27 · 2025: 32 · 2024: 35 · 2023: 25 · 2022: 24 · 2021: 30 · 2020: 28 · 2019: 31 · 2018: 39 · 2017: 23 · 2016: 21 · 2015: 30 · 2014: 36 · 2013: 30 · 2012: 24
FWCI: 10.88
Type: journal article
Language: en
Open access: closed
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor, 6779 d)
Locations: Global Biogeochemical Cycles (publishedVersion)
Helmholtz Centre for Ocean Research Kiel (GEOMAR) (acceptedVersion)
Topics: Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Plankton and Biogeochemistry
Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
Keywords: nitrogen isotopes, nitrate utilization, Rayleigh fractionation, phytoplankton nitrogen uptake, diagenesis, sinking particles, equatorial Pacific, Southern Ocean, paleoceanography, nitrogen cycling

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Sedimentary nitrogen isotopic ratio as a recorder for surface ocean nitrate utilization

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