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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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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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