(a) Eddy heat flux
(b) LDR
Figure 5: (a) Difference in the 850 hPa poleward eddy heat flux for December between the MOD and CTL runs (former minus latter). The shading interval is 0.3 K m s−1. (b) As in Figure 5(a) but for the local deepening rate (LDR). Shading interval is 3 hPa/month.