Without atmospheric circulation, how would the temperature at low latitudes compare to high latitudes?

Without atmospheric circulation, how would the temperature at low latitudes compare to high latitudes?

• A. Lower latitudes hotter; higher latitudes colder
• B. Lower latitudes colder; higher latitudes hotter
• C. Uniform temperatures worldwide
• D. Lower latitudes hotter; higher latitudes warmer

Answer: (A)

When heat distribution relies only on local solar input and radiative cooling, the amount of energy received by the surface varies strongly with latitude. The equator gets sunlight more directly and for more of the year, so it absorbs more energy per unit area and warms up more. The poles receive sunlight at a very slanted angle and for shorter effective daylight, so they absorb far less energy and lose heat efficiently, leading to colder conditions. Without atmospheric circulation to transport heat poleward, there’s no mechanism to even out these differences, so low latitudes would be hotter and high latitudes colder.

When heat distribution relies only on local solar input and radiative cooling, the amount of energy received by the surface varies strongly with latitude. The equator gets sunlight more directly and for more of the year, so it absorbs more energy per unit area and warms up more. The poles receive sunlight at a very slanted angle and for shorter effective daylight, so they absorb far less energy and lose heat efficiently, leading to colder conditions. Without atmospheric circulation to transport heat poleward, there’s no mechanism to even out these differences, so low latitudes would be hotter and high latitudes colder.