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Cristin-resultat-ID:
2054063
Sist endret:
23. februar 2023, 13:44
NVI-rapporteringsår:
2022
Resultat
Vitenskapelig artikkel
2022
Nitrogen Isotope Evidence for Changing Arctic Ocean Ventilation Regimes During the Cenozoic
Jochen Manfred Knies
Tidsskrift
Tidsskrift
Geophysical Research Letters
ISSN 0094-8276
e-ISSN 1944-8007
NVI-nivå 2
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Om resultatet
Om resultatet
Vitenskapelig artikkel
Publiseringsår: 2022
Publisert online: 2022
Trykket: 2022
Volum: 49
Hefte: 17
Artikkelnummer: e2022GL099
Open Access
Lenker
Lenker
original online (doi)
https://doi.org/10.1029/2022GL099512
Institusjonsarkiv
hdl.handle.net/10037/26926
Importkilder
Importkilder
Scopus-ID: 2-s2.0-85138007062
Beskrivelse
Beskrivelse
Engelsk
Tittel
Nitrogen Isotope Evidence for Changing Arctic Ocean Ventilation Regimes During the Cenozoic
Sammendrag
In this work, I report on the coupling of dinitrogen (N2) fixation and denitrification in oxygen-deficient waters of the Arctic Ocean during the Paleogene. This coupling fertilized marine phytoplankton growth and favored organic carbon burial. Reduced vertical mixing due to salinity stratification in a tectonically closed oceanic basin created conditions favorable for N2-fixation by phytoplankton harboring diazotrophic bacterial symbionts. A positive shift of 5‰ in the δ15N record indicates a change in the main source of biologically available nitrogen due to rapidly changing nutrient availability. I interpret this shift as a switch to Atlantic-sourced nitrate as the main nitrogen source owing to the opening of the Arctic-Atlantic gateway to the northern North Atlantic. While the timing of the opening is still disputed among the available Arctic records, I use evidence from the northern North Atlantic to argue that the Arctic Ocean has been fully ventilated since the early Neogene
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Bidragsytere
Bidragsytere
Jochen Manfred Knies
Forfatter
ved Centre for Arctic Gas Hydrate, Environment and Climate ved UiT Norges arktiske universitet
Forfatter
ved Maringeologi ved Norges geologiske undersøkelse
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Tilknyttede prosjekter
Tilknyttede prosjekter
Centre for Arctic Gas Hydrate, Environment and Climate (CAGE)
Karin Marie Andreassen + 9 deltakere
Centre for Arctic Gas Hydrate, Environment and Climate ved UiT Norges arktiske universitet
1088 resultater
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