wunder beta🏜️ Why do deserts get cold at night
Trace how dry air, clear skies, low moisture, infrared radiation, surface materials, wind, and dawn create deserts' dramatic temperature swings.
What you’ll learn
- The desert's big temperature swingExplain why dry desert surfaces can heat and cool quickly.Desert temperature ranges come from rapid surface energy changes, low moisture, clear skies, and the way the ground cools nearby air.
- From sunset to sunriseTrace the nighttime cooling cycle and identify why its strength varies by place and weather.Radiational cooling builds after sunset, often peaks near dawn, and reverses when sunlight returns; wind, terrain, clouds, and elevation modify it.
Questions this course answers
Why can a desert surface cool quickly after sunset?
Clear skies and dry air let the surface lose heat by terrestrial radiation with less atmospheric return.
What is a radiational inversion?
The ground cools first, then chills the air beside it, so temperature can increase with height.
Why do clouds often make a night warmer than a clear night?
Clouds absorb and re-emit infrared radiation, returning some energy downward and slowing cooling.
When does the lowest temperature often occur?
Nighttime losses can continue until the rising Sun begins to reverse the surface energy budget.
Which condition usually strengthens desert nighttime cooling?
Those conditions reduce atmospheric insulation and let a cold surface layer develop.
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