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A global marine‐fixed nitrogen isotopic budget: Implications for Holocene nitrogen cycling
Abstract
A nitrogen stable isotopic model was constructed in order to constrain the Holocene marine‐fixed nitrogen budget. The primary sources and sinks considered were riverine and atmospheric sources, nitrogen fixation, sedimentary and water column denitrification, and sediment burial. The source budget was found to be insensitive to changes in nitrogen fixation rates, and thus could not be used to constrain this term. However, the isotopic value of fixed nitrogen losses was very sensitive to the amount of sedimentary denitrification. If the isotopic value of marine‐fixed nitrogen has not changed during the Holocene, as supported by sedimentary records, then in order to balance the isotopic value of sinks and sources, approximately 280 Tg N yr −1 of sedimentary denitrification is required. If such a high rate of denitrification has been sustained throughout the Holocene, it implies that present‐day estimates of marine nitrogen fixation are grossly underestimated. It also implies that the marine nitrogen budget has a residence time of less than 2000 years.
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Cites
Atmospheric nitrogen is a reliable standard for natural 15N abundance measurements
Mariotti, A. (1983) · Nature · doi:10.1038/303685a0 · Cited by 908
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
The δ18O of dissolved O2 in seawater: A unique tracer of circulation and respiration in the deep sea
Bender, M. L. (1990) · Journal of Geophysical Research: Oceans · doi:10.1029/jc095ic12p22243 · Cited by 121
Cited by
Nitrogen cycles: Past, present, and future
Galloway, J. N., Dentener, F. J., Capone, D. G., Boyer, E. W., Howarth, R. W., Seitzinger, S. P., Asner, G. P., Cleveland, C. C., Green, P. A., Holland, E. A., et al. (2004) · Biogeochemistry · doi:10.1007/s10533-004-0370-0 · Cited by 5,315
Mesoscale Iron Enrichment Experiments 1993-2005: Synthesis and Future Directions
Boyd, P. W., Jickells, T., Law, C. S., Blain, S., Boyle, E. A., Buesseler, K. O., Coale, K. H., Cullen, J. J., de Baar, H. J. W., Follows, M., et al. (2007) · Science · doi:10.1126/science.1131669 · Cited by 1,542
METHODS FOR MEASURING DENITRIFICATION: DIVERSE APPROACHES TO A DIFFICULT PROBLEM
Groffman, P. M., Altabet, M. A., Böhlke, J. K., Butterbach-Bahl, K., David, M. B., Firestone, M. K., Giblin, A. E., Kana, T. M., Nielsen, L. P., & Voytek, M. A. (2006) · Ecological Applications · doi:10.1890/1051-0761(2006)016[2091:mfmdda]2.0.co;2 · Cited by 936
Microbial Nitrogen Cycling Processes in Oxygen Minimum Zones
Lam, P., & Kuypers, M. M. M. (2011) · Annual Review of Marine Science · doi:10.1146/annurev-marine-120709-142814 · Cited by 664
A review of nitrogen isotopic alteration in marine sediments
Robinson, R. S., Kienast, M., Luiza Albuquerque, A., Altabet, M., Contreras, S., De Pol Holz, R., Dubois, N., Francois, R., Galbraith, E., Hsu, T., et al. (2012) · Paleoceanography · doi:10.1029/2012pa002321 · Cited by 370
Metadata
- Authors
- Brandes, J. A., & Devol, A. H.
- Venue
- Global Biogeochemical Cycles
- Publisher
- American Geophysical Union (AGU)
- Published
- 2002-12
- Volume
- 16
- Issue
- 4
- ISSN
- 0886-6236 (ISSN-L)
- 1944-9224
- OpenAlex
- W1903622358
- Cited by
- 508
- References
- 3
- FWCI
- 8.31
- Type
- journal article
- Language
- en
- Open access
- closed
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
