The model captures the general increase in dissolved carbon and alkalinity with ventilation age, as Tropical Surface Water is subducted into the deep sea as North Atlantic Deep Water, into Antarctic Surface Water and Antarctic Deep Water, to Indian and Pacific Deep Waters. Model resolution is 3.3deg. The rate of organic production at the surface is determined by the rate of supply of phosphate from deep water. The value for n is taken to be 0.7 for the standard case. The pCO2 of the model atmosphere is determined by gas exchange with the sea surface.
Diamonds are summarized data from the Atlantic, plusses are from the Pacific.
Scatter in the data may reflect variability in organic and calcite rain rates. Organic carbon respires with O2 according to a first-order rate constant of 2 . Anoxic diagenesis is neglected.