On Greenhouse Benefits and Ozone Layer Depletion .

The destruction of the ozone layer is linked to the greenhouse effect. Human pollution has caused the notorious greenhouse effect, which has created a huge hole in the ozone layer at the Earth's north and south poles. Harmful ultraviolet radiation pours into the atmosphere from the hole in the ozone layer, while billions of oxygen molecules escape from the hole into space every minute.

There is no direct relationship between ozone depletion and the greenhouse effect, but there is an indirect relationship.

The greenhouse effect is mainly caused by greenhouse gases, such as carbon dioxide and methane.

When they are exposed to the sun, sunlight can penetrate and shine in, and at the same time they also absorb heat. When the sun can't reach it, they release heat and prevent the Earth's heat from escaping into space.

This leads to an increase in the average temperature of the Earth.

The ozone destruction is mainly due to the R12 refrigerant used in the past and now, and the damage is extremely serious, and most of the R22 refrigerants are used in the early stage, and the damage is relatively small (about 10% of the previous one) but it is still very serious overall. At present, only some high-end air conditioners and refrigerators use refrigerants that are non-ozone depleting such as R134.

In fact, the refrigerant R134 is more expensive than the former, and secondly, the requirements for the compressor will be relatively high, and the manufacturer is unwilling to invest, and now there are agreements everywhere in the world, which require that new units should use R134 and other environmentally friendly refrigerants, and many countries also have laws and regulations.

The destruction of ozone leads to an ozone hole at the poles (which is now present and expanding in the South Pole) that causes ultraviolet light to irradiate directly to the Earth, while increasing the intensity of ultraviolet radiation as the average ozone thickness decreases elsewhere.

In the end, ultraviolet radiation will cause the death of most lives, disrupt the cycle of biological chains, and thus destroy the ecology (now more and more people on the earth are suffering from cancer, which is actually caused by excessive ultraviolet radiation).

Ozone depletion is the real cause of the ozone hole, and some substances emitted into the atmosphere by human activities enter the stratosphere and react chemically with the ozone there, which will lead to ozone depletion and reduce ozone concentration.

Anthropogenic ozone-depleting substances are mainly chlorofluoroalkanes (CFXCL4-X, also known as FRon), which are widely used in refrigerator and air conditioning refrigeration, foaming foams, and electronic device cleaning, and bromofluoroalkanes (CFXBR4-X, also known as HALONS) used in special occasions to extinguish fires.

Ozone-depleting substances are very stable in the troposphere of the atmosphere and can stay for a long time, such as CF2C12 in the troposphere for about 120 years. Therefore, such substances can diffuse to various parts of the atmosphere, but when they reach the stratosphere, they will undergo a photochemical reaction under the ultraviolet radiation of the sun, releasing highly active free chlorine atoms or bromine atoms, which participate in a series of chemical reactions that lead to ozone depletion

cfxcl4-x＋hv→•cfxcl3-x＋•cl

cl＋o3→•clo＋o2

clo＋o→o2＋•cl

This reaction cycle is continuous, and each free chlorine or bromine atom can destroy about 100,000 O3 molecules, which is why chlorofluoroalkanes or bromofluoroalkanes destroy the ozone layer.

The mechanism of NO's ozone layer depletion is as follows:

O3 no O2 no2, o no2 o2 no, the total reaction formula is: o o3 2o2

In short, the final production of carbon dioxide is the culprit of the greenhouse effect, so the destruction of the ozone layer and the greenhouse effect are related.