Quantifying the impact of anthropogenic nitrogen deposition on oceanic nitrous oxide

Suntharalingam, Parvadha, Buitenhuis, Erik, Le Quere, Corinne, Dentener, Frank, Nevison, Cynthia, Butler, James H., Bange, Hermann W. and Forster, Grant (2012) Quantifying the impact of anthropogenic nitrogen deposition on oceanic nitrous oxide Geophysical Research Letters, 39 . L07605. DOI 10.1029/2011GL050778.

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Abstract

Anthropogenically induced increases in nitrogen deposition to the ocean can stimulate marine productivity and oceanic emission of nitrous oxide. We present the first global ocean model assessment of the impact on marine N2O of increases in nitrogen deposition from the preindustrial era to the present. We find significant regional increases in marine N2O production downwind of continental outflow, in coastal and inland seas (15–30%),and nitrogen limited regions of the North Atlantic and North Pacific (5–20%). The largest changes occur in the northern Indian Ocean (up to 50%) resulting from a combination of high deposition fluxes and enhanced N2O production pathways in local hypoxic zones. Oceanic regions relatively unaffected by anthropogenic nitrogen deposition indicate much smaller changes (<2%). The estimated change in oceanic N2O source on a global scale is modest (0.08–0.34 Tg N yr-1, ~3–4% of the total ocean source), and consistent with the estimated impact on global export production (~4%).

Document Type: Article
Keywords: Marine chemistry; Biogeochemistry; nitrous oxide, nitrogen deposition, anthropogenic deposition, ocean biogeochemical model
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
DOI etc.: 10.1029/2011GL050778
ISSN: 0094-8276
Related URLs:
Projects: MEMENTO
Date Deposited: 26 Apr 2012 09:04
Last Modified: 20 Jun 2017 07:23
URI: http://eprints.uni-kiel.de/id/eprint/14258

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