Empirical Earth · The Sky — Sun, Moon & Stars

Cold on Everest, hot in the desert — altitude, not distance

The claim

“If the Sun is millions of miles away, a mountaintop is closer to it than the desert — so why is the peak freezing and the desert scorching?”

What is measured

Mountaintops freeze and deserts bake because the Sun heats the ground and the atmosphere holds the warmth, so temperature tracks air pressure, density and moisture, not distance to the Sun. The thin summit even gets more sunlight than the desert and is still frozen.

What would show this is wrong

showing altitude temperatures track distance to the Sun rather than air pressure and the lapse rate, e.g. a high, thin-aired summit warmer than the lowland beneath it only because it is “closer” to the Sun, with humidity, pressure and ground heating held equal.

Sources

  1. Lapse rate & adiabatic cooling. Air temperature falls ~6.5 °C per km of altitude (dry-adiabatic ~9.8 °C/km): rising air expands into lower pressure and cools by spending its own internal ene link
  2. Why higher elevations are colder. Sunlight passes through the transparent air and warms the surface, which heats the air from below; altitude brings lower pressure, thinner air and adiabatic link
  3. Desert temperature extremes. Dry, cloudless desert air lets sunlight bake the ground with little evaporative (latent-heat) cooling, so lowland deserts exceed 50 °C (Death Valley reached 56.7 link
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