Ozone Depletion | Chlorofluorcarbons | CFCs | Stratospheric Ozone
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are. La suppression des CFC contribue donc à réduire en même temps la perte d' ozone (in Argentina), , denied the connection of GW and Ozone depletion. ozone by chlorofluorocarbons. Effects on . atoms, the chlorofluorocarbons will react with the ozone layer. cause-and-effect relationships of UV damage to effects on montre que même une faible augmentation de l'exposition au.
No new CFCs have been produced since in developed nations.
Total usage of CFCs has also fallen dramatically, particularly by aerosols. The only aerosols using CFCs in the developed world are asthma inhalers and these too are being phased out. Aerosol propellants now use only 4. Whilst chlorine is a natural threat to ozone, CFCs which contain chlorine are a man-made problem. Although CFC molecules are several times heavier than air, winds mix the atmosphere to altitudes far above the top of the stratosphere much faster than molecules can settle according to their weight.
CFCs are insoluble in water and relatively unreactive in the lower atmosphere but are quickly mixed and reach the stratosphere regardless of their weight.
How ozone works How ozone is distributed in the atmosphere.How CFC's Deplete the Ozone Layer
NOAA The sun emits electromagnetic radiation at different wavelengths, meaning energy at different intensities. The atmosphere acts like a multi-layer shield that protects Earth from dangerous solar radiation. Ozone is found in two different parts of our atmosphere.
It is found in the lower atmosphere troposphere and has nothing to do with the "ozone hole. The stratospheric ozone layer absorbs ultraviolet UV radiation, preventing dangerous UV rays from hitting Earth's surface and harming living organisms.
Global warming caused by chlorofluorocarbons, not carbon dioxide, new study says
UV rays cannot be seen or felt, but they are very powerful and change the chemical structure of molecules. UV radiation plays a small role in global warming because its quantity is not enough to cause the excess heat trapped in the atmosphere. UV radiation represents a small percentage of the energy from the sun, and is not highly absorbed or scattered in the atmosphere—especially when compared with other wavelengths, like infrared. But, ozone depletion is also concerning because it directly impacts the health of humans, and other living organisms.
Is There a Connection Between the Ozone Hole and Global Warming?
The ozone hole The ozone hole. People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the Earth's surface—where it causes health problems, from eye damage to skin cancer.
Stratospheric ozone is constantly produced by the action of the sun's ultraviolet radiation on oxygen molecules known as photochemical reactions. Although ozone is created primarily at tropical latitudes, large-scale air circulation patterns in the lower stratosphere move ozone toward the poles, where its concentration builds up. In addition to this global motion, strong winter polar vortices are also important to concentrating ozone at the poles. During the continuously dark polar winter, the air inside the polar vortices becomes extremely cold, a necessary condition for polar stratospheric cloud formation.
Is There a Connection Between the Ozone Hole and Global Warming? | Union of Concerned Scientists
Polar stratospheric clouds create the conditions for drastic ozone destruction, providing a surface for chlorine to change into ozone-destroying form.
They generally last until the sun comes up in the spring. CFCs are manufactured under the trade name Freon. The invention of chlorofluorocarbons CFCs in the late s and early s stemmed from the call for safer alternatives to the sulfur dioxide and ammonia refrigerants used at the time, CFCs found wide application after World War II. Chloroflourocarbons were first created in as non-toxic, non-flamable refrigerants, and were first produced commercially in the 's by DuPont.
The first Chlorofluorocarbon was CFC, a single carbon with two chlorines and two Fluorines attached to it. These halogenated hydrocarbons, notably trichlorofluoromethane CFC, or F and dichlorodifluoromethane CFC, or Fhave been used extensively as aerosol-spray propellants, refrigerants, solvents, and foam-blowing agents. They are well-suited for these and other applications because they are nontoxic and nonflammable and can be readily converted from a liquid to a gas and vice versa.
Chlorofluorocarbons or CFCs also known as Freon are non-toxic, non-flammable and non-carcinogenic. They contain fluorine atoms, carbon atoms and chlorine atoms.