Sedimentary nitrogen isotopic ratio as a recorder for surface ocean nitrate utilization
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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The mantle has δ15N = −5 ± 2‰.
“Sedimentary organics have δ15N = 7 ± 1‰ compared to 0‰ in N2 in modern and ancient air and − 5 ± 2‰ in the mantle (151, 152).”
From The Archean atmosphere (2020) · cites this paper as [152]
Sedimentary organics have δ15N = 7 ± 1‰.
“Sedimentary organics have δ15N = 7 ± 1‰ compared to 0‰ in N2 in modern and ancient air and − 5 ± 2‰ in the mantle (151, 152).”
From The Archean atmosphere (2020) · cites this paper as [152]
N2 in modern and ancient air has δ15N = 0‰.
“Sedimentary organics have δ15N = 7 ± 1‰ compared to 0‰ in N2 in modern and ancient air and − 5 ± 2‰ in the mantle (151, 152).”
From The Archean atmosphere (2020) · cites this paper as [152]
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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
- 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
- Locations
- Global Biogeochemical Cycles (publishedVersion)
- Helmholtz Centre for Ocean Research Kiel (GEOMAR) (acceptedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- 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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