Question

What forces the temperature to increase with the altitude in the troposphere?

Answer 1

Above the troposphere, temperature increases reaching freezing range (0°C, 273°K) at 50 km. Then, temperature goes down again and at about 80–90 km is 80°C (190°K). Wikipedia: In the Earth's atmosphere, temperature varies greatly at different heights relative to the Earth's surface.

Why does temperature decrease with increase in altitude? - Quora

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Answer 2

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Above ∼90 km. Strong temperature increase with height (temperature inversion), due to absorption of UV-radiation by O2 and N. Extremely “thin” atmosphere (temperature high, but almost no mass: energy content is low)