Figure 1: Calculation of the MHF from radiative balance values in the ERBE dataset  (left) and HadGEM1 (right). (a) and (b) show the annual average radiative balance. (c) and (d) multiply (a) and (b) by the area in each latitude band. (e) and (f) sum these values from S to N to give the MHF. Dotted lines in (e) and (f) show the result from N to S. (a), (c), and (e) are copied from Figures 2(a), 2(b), and 2(c) of Wunsch 2005 .