Coupling of oceanic carbon and nitrogen facilitates spatially resolved quantitative reconstruction of nitrate inventories

Glock, Nicolaas, Erdem, Zeynep, Wallmann, Klaus, Somes, Christopher J., Liebetrau, Volker, Schönfeld, Joachim, Gorb, Stanislav and Eisenhauer, Anton (2018) Coupling of oceanic carbon and nitrogen facilitates spatially resolved quantitative reconstruction of nitrate inventories Nature Communications, 9 (Article number 1217). DOI 10.1038/s41467-018-03647-5.

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Abstract

Anthropogenic impacts are perturbing the global nitrogen cycle via warming effects and pollutant sources such as chemical fertilizers and burning of fossil fuels. Understanding controls on past nitrogen inventories might improve predictions for future global biogeochemical cycling. Here we show the quantitative reconstruction of deglacial bottom water nitrate concentrations from intermediate depths of the Peruvian upwelling region, using foraminiferal pore density. Deglacial nitrate concentrations correlate strongly with downcore δ13C, consistent with modern water column observations in the intermediate Pacific, facilitating the use of δ13C records as a paleo-nitrate-proxy at intermediate depths and suggesting that the carbon and nitrogen cycles were closely coupled throughout the last deglaciation in the Peruvian upwelling region. Combining the pore density and intermediate Pacific δ13C records shows an elevated nitrate inventory of >10% during the Last Glacial Maximum relative to the Holocene, consistent with a δ13C-based and δ15N-based 3D ocean biogeochemical model and previous box modeling studies.

Document Type: Article
Additional Information: The model code and output for the 3D Biogeochemical modeling on deglacial δ13CDIC-[NO3−] coupling are available on the GEOMAR Thredds Server (https://thredds.geomar.de).
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Kiel University
Refereed: Yes
DOI etc.: 10.1038/s41467-018-03647-5
ISSN: 2041-1723
Projects: SFB754, PalMod
Expeditions/Models:
Date Deposited: 26 Mar 2018 12:28
Last Modified: 26 Mar 2018 12:30
URI: http://eprints.uni-kiel.de/id/eprint/42406

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