Abstract
We measured the quantity of d 13 C in total dissolved inorganic carbon in seawater collected between 488N and 158S along . 1758E in the central North Pacific during the Northwest Pacific Carbon Cycle Study program NOPACCS in 1993 and 1994, focusing on the distribution of d 13 C on isopycnal surfaces of 25.6, 26.0, 26.4, 26.8 and 27.2 s in the main u pycnocline of the North Pacific. The distribution of d 13 C was controlled largely by biological cycling. Using apparent oxygen utilization as a measure of biological effects on d 13 C variation, we calculated preformed values of d 13 C at the time when the water left the surface. The preformed d 13 C showed a trend of increasing southward in the subtropical region on all the surfaces. Variations in preformed d 13 C on the surfaces between 25.6 and 26.4 s in the subtropical region most likely u
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