How strong is the Harvardton-Bear constraint?

We compare the sensitivity of the partial pressure of CO2 in the warm surfa ce ocean and atmosphere to the influence of the ocean's cold water outcrops in a wide spectrum of models. While in simple box models the cold ocean do minates, in three-dimensional ocean general circulation models, this influe nce is considerably smaller, suggesting that exchange processes between the warm and cold regime in the real ocean are extremely important in determin ing the distribution of chemical properties.