Spatial coupling of nitrogen inputs and losses in the ocean

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Author(s) Deutsch, Curtis, Sarmiento, Jorge L., Sigman, Daniel M., Gruber, Nicolas, Dunne, John P.
Publication Type Journal Items, Publication Status: Published
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Title Spatial coupling of nitrogen inputs and losses in the ocean
Author(s) Deutsch, Curtis
Sarmiento, Jorge L.
Sigman, Daniel M.
Gruber, Nicolas
Dunne, John P.
Journal or Series Title Nature
Volume Number 445
Issue Number 7124
Start Page 163
End Page 167
ISSN 0028-0836
1476-4687
Publisher Nature Publ. Group
Publication Place London
Publication Date 2007-00-00
Abstract Nitrogen fixation is crucial for maintaining biological productivity in the oceans, because it replaces the biologically available nitrogen that is lost through denitrification. But, owing to its temporal and spatial variability, the global distribution of marine nitrogen fixation is difficult to determine from direct shipboard measurements. This uncertainty limits our understanding of the factors that influence nitrogen fixation, which may include iron, nitrogen-to-phosphorus ratios, and physical conditions such as temperature. Here we determine nitrogen fixation rates in the world's oceans through their impact on nitrate and phosphate concentrations in surface waters, using an ocean circulation model. Our results indicate that nitrogen fixation rates are highest in the Pacific Ocean, where water column denitrification rates are high but the rate of atmospheric iron deposition is low. We conclude that oceanic nitrogen fixation is closely tied to the generation of nitrogen-deficient waters in denitrification zones, supporting the view that nitrogen fixation stabilizes the oceanic inventory of fixed nitrogen over time.
DOI 10.1038/nature05392
Additional Notes Received 7 August 2006, accepted 7 November 2006
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
03267
Organisational Unit(s)
NEBIS System Number 000984850
Source Database ID PP-38765
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@article{Dtsch2007,
  author = "Deutsch, Curtis and Sarmiento, Jorge L. and Sigman, Daniel M. and Gruber, Nicolas and Dunne, John P.",
  title = "{S}patial coupling of nitrogen inputs and losses in the ocean",
  journal = "Nature",
  year = 2007,
  volume = "445",
  number = "7124",
  pages = "163--167",
}


E-Citations record created: Thu, 01 Apr 2010, 21:24:34 CET