Carbon 13 measurements on dissolved inorganic carbon at the North Pacific (1969) Geosecs station

Samples from 22 depths at the Geosecs station were measured for carbon 13 independently at Scripps Institution of Oceanography (SIO) and Woods Hole Institution of Oceanography (WHIO). The mean deviation between the two sets of data is −0.02‰ and the absolute deviation is 0.06‰. These differences are within the intralaboratory precision. A diffusion-advection model is used to estimate that the CO2 flux is derived about 70±7% from the dissolution of carbonate. The deep water shows a decrease in δ13C of 0.5‰ and an increase in ΣCO2 of 3% relative to a South Pacific profile.