why troposphere is 8 km at poles but 18 km at the equator ??
Answers
The height of tropopause is neither constant in space nor in time. There is a marked seasonal and latitudinal variation in its altitude also. At the Equator, it is usually 16 to 17 km but at the Poles it is about 8 to 9 km.
In the middle and high latitudes, the height of the tropopause varies according to seasons. For example, at 45°N and S lat., the average height of tropopause in January is about 12.5 km while in July it becomes 15 km
This difference in height is because of constant convection taking place at the equator. Convection forces the tropospheric levels to be high as high as 18 kms at the equator and constant sinking of air and subsidence forces it to be only 8 kms. The equatorial region is marked by turbulence and eddies (thus, also known as convective layer) and hence, has an appreciable vertical component of air motion leading to a height of 18 kms.
Answer:
As the temperature decreases with height, so the temperature at the tropopause over the poles will be higher than over the equator because the tropopause is closer to the ground here. This is the opposite situation to the surface temperature......
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