Answer Posted / rayniela manaloto
in reality, the air is not warmed directly by the sun's
rays, but by infrared, or long-wave radiation from the
earth. The sun's rays strike
the earth, and are absorbed by the earth, which raises the
temperature of the earth. The earth re-radiates the energy
at a wavelength dependent on the temperature of the earth.
The air is able to absorb the earth radiation, and becomes
warmer. At high altitudes, as on mountain tops, strong winds
keep the air mixed, and prevent much rise in temperatures
near the surface of the mountain. Also as you go up the
heating factor, the land becomes progressively lesser.
Vegetation also reduces heat as most of the suns energy is
used to evaporate water.
As you go up in altitude from the surface of the earth, the
air cools at a fixed rate. This is called the "lapse rate,"
and for unsaturated air, that rate is about 5 deg. C. for
each thousand feet of altitude. For saturated air, the rate
is about 3.5 deg.C. for each thousand feet of altitude. Wind
mixes this colder air on mountain tops and hill stations...
But plateaus like ladakh is a different story! :))
| Is This Answer Correct ? | 13 Yes | 10 No |
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