 Over the same interval, the power generated by the Hadley regime has risen at an average rate of about 0.54 TW per year; this reflects an increase in energy input to the system consistent with the observed increasing of tropical sea surface temperatures.Overall, the mean meridional circulation cells such as the Hadley circulation are not particularly efficient at reducing the equator-to-pole temperature gradient due to cancellation between transports of different types of energy.In the Hadley cell, both sensible and latent heat are transported equatorward near the surface, while potential energy is transported above in the opposite direction, poleward.