Why is the height of tropopause over the Equator more than over the poles?
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Troposphere is the lowest portion of Earth’s atmosphere and contains approximately 80% of the atmosphere’s mass and 99% of its water vapour and aerosols. The average depth of the troposphere is approximately 17 km in the middle latitudes. The characteristic features of the Troposphere are its great density. In addition to nitrogen and oxygen, carbon dioxide, and water vapour (nearly all of the water vapour contained in the atmosphere is concentrated in the troposphere) and of numerous particles of various origin.
Answer:
Temperature doesn't depends upon the surface temperature (of the Earth)
It depends upon the height from the surface of the earth.
Since troposphere at poles is at height ranging 6-8km above the earth surface and at equator the height being 16-18 km.
The rate of fall of temperature (assuming NLR =6.4'/km )
Therefore the temperature above equator will be much much lower