Y. Kumamoto et al., Distribution of radiocarbon in the western North Pacific: Preliminary results from MR97-02 cruise in 1997, NUCL INST B, 172, 2000, pp. 495-500
In the transition area between the subarctic and subtropical regions in the
western North Pacific, vertical distributions of radiocarbon at seven stat
ions were clarified by AMS radiocarbon measurement in 1997. The radiocarbon
in intermediate water at those stations indicate (1) direct ventilation of
upper intermediate water above 26.6 sigma (theta) surface and (2) no tempo
ral increment of radiocarbon in the transition area during the last two dec
ades. These results positively suggest that the North Pacific intermediate
water is formed in the transition area in the western North Pacific. (C) 20
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