What is the composition of the ozone layer? What is the role of the ozone layer?

What does the ozone layer do?

The atmospheric ozone layer has three main functions:Protection, heating, greenhouse gases.

1. Protective

The ozone layer can absorb ultraviolet rays below the wavelength of sunlight, mainly part of UV-B (wavelength 290 300nm) and all UV-C (wavelength < 290nm), protecting humans, animals and plants on the earth from short-wave ultraviolet rays.

Only UVA and a small amount of UV-B can radiate to the ground, and UVA is much less harmful to biological cells than UVB. Therefore, the ozone layer is like a protective umbrella to protect the survival and reproduction of life on the earth.

2. Heating effect

Ozone absorbs ultraviolet rays from sunlight and converts them into heat energy to heat the atmosphere, and as a result of this effect, the atmospheric temperature structure has a peak at an altitude of about 50 km, and there is a warming layer 15 50 km above the Earth. It is because of the presence of ozone that the stratosphere exists. Planets other than Earth do not have ozone and oxygen, so there is no stratosphere.

The temperature structure of the atmosphere has an important influence on the circulation of the atmosphere, and the cause of this phenomenon is also due to the high distribution of ozone.

3. The role of greenhouse gases

The role of ozone is also very important in the upper troposphere and at the bottom of the stratosphere, at very low temperatures. If ozone decreases at this height, there will be a drive to lower the surface air temperature. Therefore, the high distribution and variation of ozone is extremely important.

<> ozone layer has three main functions:

1. ProtectiveThe ozone layer absorbs ultraviolet rays in sunlight with wavelengths below nanometers, protecting humans, animals and plants on Earth from short-wave ultraviolet light.

2. Heating effectOzone absorbs ultraviolet rays from sunlight and converts them into heat energy to heat the atmosphere.

3. The role of greenhouse gases. In the upper troposphere and at the bottom of the stratosphere, if ozone is reduced at this height, there is a dynamic that causes surface air temperatures to drop. Therefore, the high distribution and variation of ozone is extremely important.

Introduction to the ozone layer

The ozone layer is the stratosphere of the atmosphere at which ozone concentrations are high. The largest concentrations are located at altitudes of 20-25 km. If the ozone of the ozone layer is calibrated to the standard, its thickness is only about 3 mm on average.

Ozone levels vary with latitude, season, and weather, among other things.

The ozone in the ozone layer is mainly produced by ultraviolet light. There are two types of ultraviolet rays in the sun's rays, long-wave and short-wave, and when the oxygen molecules in the atmosphere (containing 21%) are exposed to short-wave ultraviolet light, the oxygen molecules break down into an atomic state. Oxygen atoms are extremely unstable and easily react with other substances.

Nearly 1% of the sun's ultraviolet rays reach the ground. In particular, forests, mountains, and coastal areas with low air pollution have a lot of ultraviolet rays, and ozone is abundant.