What is the three-layer structure of the atmosphere?

According to the temperature, density and motion of the atmosphere, the atmosphere is divided into troposphere, stratosphere and upper atmosphere. The density of the atmosphere decreases with the increase of altitude.

1, troposphere

The troposphere is the lowest layer of the atmosphere. Its height varies with latitude and season. As far as latitude is concerned, the average low latitude17 ~18 km; Mean mid-latitude10 ~12km; The high latitude is only 8 ~ 9 kilometers. In terms of seasons, the height of the upper troposphere is higher in summer than in winter.

Main features of troposphere:

① The temperature decreases with the elevation (the average temperature decreases by 0.6℃ with each elevation of 100m).

② The air has a strong convection movement.

③ The weather is complex and changeable (75% of air mass and 90% of water vapor are concentrated in the troposphere, so the water phase changes with strong convection, forming complex weather phenomena such as clouds, rain and snow).

2.stratosphere

55 kilometers from the tropopause.

The main features of the stratosphere:

① Temperature increases with height.

② The air mainly moves horizontally.

③ The stratosphere is sunny and the atmosphere is transparent.

3. Upper atmosphere

Main features: thin air; With the ionosphere, the temperature first drops and then rises with height.