Quantifying the impact of anthropogenic nitrogen deposition on oceanic nitrous oxide

Details Quantifying the impact of anthropogenic nitrogen deposition on oceanic nitrous oxide Quantifying the impact of anthropogenic nitrogen deposition on oceanic nitrous oxide

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3907605s&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 7, CiteID L07605

Physics

Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Global Change: Impacts Of Global Change (1225, 4321), Global Change: Oceans (1616, 3305, 4215, 4513), Oceanography: General: Numerical Modeling (0545, 0560, 1952)

Scientific paper

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 pre-industrial 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%).

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