ABSTRACT. We assessed marine reservoir age R(t) for the costal area of the northwest Pacific using radiocarbon measurements of the annually banded coral core (Porites sp) collected on Ishigaki Island in southern Japan. Reservoir age R(t) during the early 1900s at the Pacific coast of Ishigaki Island ranged between 290 and 455 14 C yr, with a weighted mean of 355 ± 25 14 C yr (n=5, ±1 σ). The regional-specific ∆R, defined as 14 C age difference of regional and world ocean surface layer, was 35 ± 25 14 C yr (n=5, ±1 σ) on average and increased between 1900 and 1950.
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