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Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin

Sherwood, Owen A. and Davin, Samuel H. and Lehmann, Nadine and Buchwald, Carolyn and Edinger, Evan N. and Lehmann, Moritz F. and Kienast, Markus. (2021) Stable isotope ratios in seawater nitrate reflect the influence of Pacific water along the northwest Atlantic margin. Biogeosciences, 18 (15). pp. 4491-4510.

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Official URL: https://edoc.unibas.ch/86536/

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Abstract

The flow of Pacific water to the North Atlantic exerts a globally significant control on nutrient balances between the two ocean basins and strongly influences biological productivity in the northwest Atlantic. Nutrient ratios of nitrate (NO3-) versus phosphate (PO34-) have previously been used to complement salinity characteristics in tracing the distribution of Pacific water in the North Atlantic. We expand on this premise and demonstrate that the fraction of Pacific water as determined by NO3-:PO34- ratios can be quantitatively predicted from the isotopic composition of subeuphotic nitrate in the northwest Atlantic. Our linear model thus provides a critically important framework for interpreting delta N-15 signatures incorporated into both modern marine biomass and organic material in historical and paleoceanographic archives along the northwest Atlantic margin.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Geochemie Stoffkreisläufe (Lehmann)
UniBasel Contributors:Lehmann, Moritz F
Item Type:Article, refereed
Article Subtype:Research Article
ISSN:1726-4170
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:03 Feb 2022 10:51
Deposited On:03 Feb 2022 10:51

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