Hadley cell
The Hadley circulation exhibits seasonal variation. During the solstitial seasons (DJF and JJA), the upward branch of the Hadley cell occurs not directly over the equator but rather in the summer hemisphere. In the annual mean, the upward branch is slightly offset into the northern hemisphere, making way for a stronger Hadley cell in the southern hemisphere. This evidences a small net energy transport from the northern to the southern hemisphere.