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Measurements of tritium, helium‐3, together with salinity, yield 11 years as Arctic Basin residence time of the halocline waters in the Arctic outflow in the Fram Strait. Radiocarbon and tritium data on the deeper waters point at some penetration of surface waters down to 1500 m during the last 20 years. Even at 2500 m, the 14C activity is within 1% (80 years) of modern pre‐bomb values.
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Östlund et al. (1982) studied this question.
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