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- W2529713763 abstract "In oxic environments, nitrogen (N) is frequently a limiting nutrient for primary production and hence a controllingelement in marine ecosystems. The fixed form of N, i.e. bioavailable N for primary production, is primarily inthe oxidized form of nitrate (NO3-). However, in the sub-oxic environments of oxygen minimum zones (OMZs),N-species are biochemically converted to biogenic N2 gas which is then released, or lost, to the atmosphere.N-cycling under sub-oxic conditions thus diminishes the oceanic pool of bioavailable N. It has been suggestedthat although OMZs constitute only about 1% of global ocean volume, they account for about 20-40% of globaloceanic N loss. However, to date these estimates are subject to largely uncertainties.Here, we quantify the rate of N-cycling and the associated N-loss by evaluating all terms of a benthic-pelagicnutrient transport budget at the continental margin off Peru using observations from an extensive measurementprogram conducted along the continental slope and shelf region at 12°S. The data set was collected during australsummer in 2013 and consists of nutrient, microstructure and CTD/O 2profiles as well as shipboard velocity datafrom two research cruises, a glider swarm experiment and current time series from a moored array. To constrainthe benthic contribution to the nutrient budget, benthic nutrient fluxes were measured in benthic chambers usingBiogeochemical Observatory (BIGO) landers.Detailed budget determinations were performed on the upper continental slope and shelf break as well as atthe shelf. Both regions were anoxic but different with regard to nutrient distribution as well as benthic nutrientrelease rates. Three major conclusions can be inferred from the study: (1) Unexpectedly, the results showed thatdiapycnal nutrient fluxes, driven by turbulent mixing caused by the breaking of non-linear internal waves, wasone to two orders of magnitude larger than advective and lateral-diffusive fluxes. (2) The relative contributionof benthic nutrient fluxes to nutrient cycling was between 30% and 50%. (3) Nitrogen conversion rates on theshelf (50m-100m water depth) were an order of magnitude larger that at the continental slope (200m-300mwater depth). The strong differences in the magnitude of the nutrient cycling rates most likely originate from thepresence of sulfidic bottom waters that were observed on the shelf" @default.
- W2529713763 created "2016-10-14" @default.
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- W2529713763 date "2015-04-01" @default.
- W2529713763 modified "2023-09-24" @default.
- W2529713763 title "A nitrogen budget for the continental margin of the Peruvian oxygen minimum zone" @default.
- W2529713763 hasPublicationYear "2015" @default.
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