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• W2160146780 abstract "Sediment records of the stable isotopic composition of N (δ15N) show light δ15N values at several sites in the proto-North Atlantic during Oceanic Anoxic Event 2 (OAE 2) at the Cenomanian-Turonian transition (∼94 Ma). The low δ15N during the event is generally attributed to an increase in N2 fixation and incomplete uptake of for phytoplankton growth. A compilation of all reliable data for the proto-North Atlantic during OAE 2 demonstrates that the most pronounced negative shift in δ15N from pre-OAE 2 to OAE 2 occurs in the open ocean but with δ15N never lower than −3‰. Using a box model of N cycling for the proto-North Atlantic during OAE 2, we show that N2 fixation is a major contributor to the δ15N signal, especially in the open ocean. Incomplete uptake of for phytoplankton growth is important in regions dominated by downwelling, with lateral transport of acting as a major source. In the southern proto-North Atlantic, where bottom waters were euxinic, the light δ15N signature is largely explained by upwelling of . Our study provides an overview of regional differences in δ15N in the proto-North Atlantic and highlights the role of lateral exchange of water and nutrients, in addition to local biogeochemical processes, in determining δ15N values of OAE 2 sediments." @default.
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• W2160146780 date "2015-07-01" @default.
• W2160146780 modified "2023-09-27" @default.
• W2160146780 title "The nitrogen isotope composition of sediments from the proto-North Atlantic during Oceanic Anoxic Event 2" @default.
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• W2160146780 doi "https://doi.org/10.1002/2014pa002744" @default.
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