Which atmospheric effect weakens the temperature gradient between tropics and poles?

💡 Explanation

When Hadley cells circulate, warm air rises near the equator and sinks in the subtropics because of density gradients, transferring heat poleward, which diffuses temperature. Therefore, the meridional heat transfer weakens the temperature gradient, rather than wave propagation, current transport or pressure balance which involve different mechanisms.

• Which mechanism causes the formation of terraced alluvial fans in arid environments after prolonged tectonic uplift?
• Which mechanism causes strong regional uplift during flat-slab subduction?
• Which outcome occurs when differential stress exceeds the static friction across a fault plane at depth?
• Which process accelerates coastal erosion when rising sea temperatures thaw coastal permafrost?
• Which outcome arises when tectonic uplift decreases a lake's catchment area and inflow?
• Which outcome occurs when a steep mountain slope underlying a glacial cirque thaws, exceeding its angle of repose?