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# 42 why does temperature decrease with height in the

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42. Why does temperature decrease with height in the Troposphere? a. It is heated from the ground up. Even though the sun's energy comes down from the sky, it is mostly absorbed by the ground (50 % reaches the ground, 30% reflected by clouds, 20% absorbed by atmosphere) b. The ground is constantly releasing this energy, as heat in infrared light, so the troposphere is actually heated from the ground up, causing it to be warmer near the surface and cooler higher up. c. The surface is warmed by the sun and then this energy is distributed upwards into the troposphere through a mixing of the air. Since the earth's surface is the primary heat source, temperatures will be warmest at the surface and decrease away from the surface. 43. List three properties of the troposphere. a. Temperatures decrease with altitude i. Except when there is a temperature inversion (warmer as you go up) near the surface

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ii. The temperature at which the atmosphere cools as you ascend from the surface into the troposphere iii. Environmental lapse rate 6.5 deg C/km b. Thinnest of all 4 layers i. But contains most of the particles or mass – 75% ii. Because density is greater at the surface c. Depth can vary greatly from 3.6 miles (poles) to 11 miles (equator) above the Earth’s surface i. Depth varies with latitude and season 1. Summer it is higher 2. Higher at the equator in all seasons ii. Depth varies due to rising convective currents at the equator d. 44. What property of the Earth’s surface is responsible for the Planetary Boundary Layer? Describe the behavior of the wind in the PBL.
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