Ar-39 ages on ocean water samples are consistently younger than C-14 ages. The difference is the result of diffusive mixing in the sea which has a greater impact on ages based on short-lived than those based on long-lived radiotracers. It is clear that a more dense survey of Ar-39 with higher accuracy measurements would prove of great value in constraining ocean general circulation models. (C) 2000 Elsevier Science B.V. All rights reserved.
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