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The eastern tropical Pacific as a source of 15N‐enriched nitrate in seawater off southern California
Open accessAbstract
Dissolved nitrate in the subsurface water (200–650 m) off southern California is unusually high in δ1 5N compared with waters from the same depth in the central and western Pacific, which have δ15N values similar to the deep oceans. More than 150 seawater samples from the sea off southern California and the North Atlantic were analyzed for the δ15N of nitrate. The mean δ15 N (± 1 SD) of deep waters (>1,500 m) is 5.7±0.7‰. The mean δ15 N in the 15 N‐anomaly zone off southern California is 9.0±0.7‰. Maxima of δ15 N were found to coincide with salinity maxima, which occurred in the same isopycnal levels as the 15 N‐enriched denitrifying zone in the eastern tropical North Pacific (ETNP). Using the correlation between δ15 N and salinity, we can show the southern California waters to be of mixed origin with the denitrifying water from the ETNP as one end member. Our observations support the notion that the oxygen‐deficient waters in the eastern tropical Pacific are important sources of 15 N‐enriched nitrate.
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Cites
Climatological Atlas of the World Ocean
Levitus, S. (1983) · Eos, Transactions American Geophysical Union · doi:10.1029/eo064i049p00962-02 · Cited by 3,078
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Alexander Bentley, R. (2006) · Journal of Archaeological Method and Theory · doi:10.1007/s10816-006-9009-x · Cited by 1,311
Sedimentary nitrogen isotopic ratio as a recorder for surface ocean nitrate utilization
Altabet, M. A., & Francois, R. (1994) · Global Biogeochemical Cycles · doi:10.1029/93gb03396 · Cited by 792
Codispoti, L. A. (2007) · Biogeosciences · doi:10.5194/bg-4-233-2007 · Cited by 299
Seasonal and depth-related changes in the source of sinking particles in the North Atlantic
Altabet, M. A., Deuser, W. G., Honjo, S., & Stienen, C. (1991) · Nature · doi:10.1038/354136a0 · Cited by 274
Metadata
- Authors
- Liu, K., & Kaplan, I. R.
- Venue
- Limnology and Oceanography
- Publisher
- Wiley
- Published
- 1989-07
- Volume
- 34
- Issue
- 5
- Pages
- 820-830
- ISSN
- 0024-3590 (ISSN-L)
- 1939-5590
- OpenAlex
- W2115859175
- Cited by
- 351
- References
- 1
- FWCI
- 3.42
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Liu, K., & Kaplan, I. R. (1989). The eastern tropical Pacific as a source of 15N‐enriched nitrate in seawater off southern California. Limnology and Oceanography. https://doi.org/10.4319/lo.1989.34.5.0820
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