Which mechanism causes the latitudinal extent of Hadley cells to expand poleward during summer months?

💡 Explanation

When land-sea temperature contrast increases during summer, the land heats up faster, intensifies the thermal gradient, steepening pressure gradients, and strengthening atmospheric circulation, thus causing Hadley cells to expand. Therefore increased temp contrast causes expansion, rather than polar heating, Coriolis force reduction, or ozone depletion that have different latitudinal atmospheric effects.

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