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• W4221010909 abstract "Abstract This study explores for the first time the possibilities that the 233 U/ 236 U atom ratio offers to distinguish waters of Atlantic or Pacific origin in the Arctic Ocean. Atlantic waters entering the Arctic Ocean often carry an isotopic signature dominantly originating from European reprocessing facilities with some smaller contribution from global fallout nuclides, whereas northern Pacific waters are labeled with nuclides released during the atmospheric nuclear testing period only. In the Arctic Ocean, 233 U originates from global fallout while 236 U carries both, a global fallout and a prominent nuclear reprocessing signal. Thus, the 233 U/ 236 U ratio provides a tool to identify water masses with distinct U sources. In this work, 233 U and 236 U were analyzed in samples from the GN01 GEOTRACES expedition to the western Arctic Ocean in 2015. The study of depth profiles and surface seawater samples shows that: (a) Pacific and Atlantic waters show enhanced signals of both radionuclides, which can be unraveled based on their 233 U/ 236 U signature; and (b) Deep and Bottom Waters show extremely low 233 U and 236 U concentrations close to or below analytical detection limits with isotopic ratios distinct from known anthropogenic U sources. The comparably high 233 U/ 236 U ratios are interpreted as a relative increase of naturally occurring 233 U and 236 U and thus for gradually reaching natural 233 U/ 236 U levels in the deep Arctic Ocean. Our results set the basis for future studies using the 233 U/ 236 U ratio to distinguish anthropogenic and pre‐anthropogenic U in the Arctic Ocean and beyond." @default.
• W4221010909 created "2022-04-03" @default.
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• W4221010909 date "2022-03-01" @default.
• W4221010909 modified "2023-10-18" @default.
• W4221010909 title "The Potential of ²³³U/²³⁶U as a Water Mass Tracer in the Arctic Ocean" @default.
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• W4221010909 doi "https://doi.org/10.1029/2021jc017790" @default.
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