Figure 2. Warm and cold season latitudinal SST gradients for the North Atlantic Ocean. A.) Estimates of modern SST based upon MAT analyses of four core-tops are plotted as points with error bars of 1 standard deviation (s.d.). B.) Estimated Pliocene (2.795 Ma) SST gradients are based upon MAT analyses of four DSDP/ODP Sites in the North Atlantic (see text). Error bars are 1 s.d.