Distribution of total carbonate and related properties in the North Pacific along 30 degrees N

Cross sections of the total carbonate (TC), titration alkalinity (TA), and pH were observed during the WOCE/JGOFS-P2 cruise (30 degrees N, 130 degrees E - 122 degrees W). The increases in TC in the years since 1973 are calcul ated by the comparison of TC data observed during P2 and those observed dur ing the Geochemical Ocean Section Study. At stations east of 170 degrees W, TC has increased proportionally to the atmospheric increase of CO2 in wate r shallower than the sigma(theta) = 26.20 density surface, while at station s west of 180 degrees E TC had increased proportionally to the atmospheric increase only in water shallower than the sigma(theta) =25.40 density surfa ce. Increase in the column inventory of TC is 143+/-32 gC/m(2) on average a nd does not significantly differ with longitude.