Figure 12. Alkalinity versus total CO2, model versus data. [ENP 6 (46 deg.N, 150 deg.W; closed diamonds); ENP 4 (50 deg.N, 150 deg.W; open diamonds); ENP 2 (54 deg.N, 151 deg.W; closed triangles); GEOSECS station 217 (46 deg.N, 177 deg.W; closed circles); GEOSECS 218 (51 deg.N, 177 deg.W; open circles). ENP data from Cline, et al. (1985). Values at a density of 26.8 (200 meters depth at Papa) plot in the upper right; values at the sea surface are in the lower left. Light solid lines are contours of pCO2 calculated for one atmosphere pressure and 8 deg.C. The comparison assures us that the processes that control the carbon cycle in the upper ocean are represented in the model.