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The oceanic fixed nitrogen and nitrous oxide budgets: Moving targets as we enter the anthropocene?
Open accessAbstract
New data force us to raise previous estimates of oceanic denitrification. Our revised estimate of ~ 450 Tg N yr-1 (Tg = 1012 g) produces an oceanic fixed N budget with a large deficit (~ 200 Tg N yr-1) that can be explained only by positing an ocean that has deviated far from a steady-state, the need for a major upwards revision of fixed N inputs, particularly nitrogen fixation, or both. Oceanic denitrification can be significantly altered by small re-distributions of carbon and dissolved oxygen. Since fixed N is a limiting nutrient, uncompensated changes in denitrification affect the ocean´s ability to sequester atmospheric CO2 via the "biological pump". We have also had to modify our concepts of the oceanic N2O regime to take better account of the extremely high N2O saturations that can arise in productive, low oxygen waters. Recent results from the western Indian Shelf during a period when hypoxic, suboxic and anoxic waters were present produced a maximum surface N2O saturation of > 8000%, a likely consequence of "stop and go" denitrification. The sensitivity of N2O production and consumption to small changes in the oceanic dissolved oxygen distribution and to the "spin-up" phase of denitrification suggests that the oceanic source term for N2O could change rapidly.
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Froelich, P. N., Klinkhammer, G. P., Bender, M. L., Luedtke, N. A., Heath, G. R., Cullen, D., Dauphin, P., Hammond, D., Hartman, B., & Maynard, V. (1979) · Geochimica et Cosmochimica Acta · doi:10.1016/0016-7037(79)90095-4 · Cited by 3,368
The Global Carbon Cycle: A Test of Our Knowledge of Earth as a System
Falkowski, P., Scholes, R. J., Boyle, E., Canadell, J., Canfield, D., Elser, J., Gruber, N., Hibbard, K., Högberg, P., Linder, S., et al. (2000) · Science · doi:10.1126/science.290.5490.291 · Cited by 2,177
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A Cryptic Sulfur Cycle in Oxygen-Minimum–Zone Waters off the Chilean Coast
Canfield, D. E., Stewart, F. J., Thamdrup, B., De Brabandere, L., Dalsgaard, T., Delong, E. F., Revsbech, N. P., & Ulloa, O. (2010) · Science · doi:10.1126/science.1196889 · Cited by 624
Metadata
- Authors
- Codispoti, L. A., Brandes, J. A., Christensen, J. P., Devol, A. H., Naqvi, S. W. A., Paerl, H. W., & Yoshinari, T.
- Venue
- Scientia Marina
- Publisher
- Editorial CSIC
- Published
- 2001-12-30
- Volume
- 65
- Issue
- S2
- Pages
- 85-105
- ISSN
- 0214-8358 (ISSN-L)
- 1886-8134
- OpenAlex
- W2122911960
- Cited by
- 806
- References
- 2
- FWCI
- 9.17
- Type
- journal article
- Language
- en
- Open access
- diamond
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- Codispoti, L. A., Brandes, J. A., Christensen, J. P., Devol, A. H., Naqvi, S. W. A., Paerl, H. W., & Yoshinari, T. (2001). The oceanic fixed nitrogen and nitrous oxide budgets: Moving targets as we enter the anthropocene? Scientia Marina. https://doi.org/10.3989/scimar.2001.65s285
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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