Ozone depletion definition of ozone depletion by the free. Understanding that global warming is caused by ozone depletion, not greenhouse gases, has major implications for investments in energy. Ozone depletion ozone depletion chlorofluorocarbon free. Ozone is a gas that is present in the ozone layer in the stratosphere of the earth.
Ozone depletion ozone layer depletion, is simply the wearing out reduction of the amount of ozone in the stratosphere. Protecting the ozone layer department of the environment. Ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. The science of ozone depletion ozone depletion is the result of a complex set of circumstances and chemistry. Ozone secretariat the secretariat for the vienna convention for the protection of the ozone layer and for the montreal protocol on substances that deplete the ozone layer united nations environment programme nairobi, kenya ozone. Revision of definition of applicable requirement for title v operating. The ozone layer protects humans, animals, and plants from harmful ultraviolet rays. Ozone depletion definition and meaning collins english. My teaching and textbook1 have always covered many physicsrelated social issues, including stratospheric ozone depletion and global warming. If ozone depletion at high altitudes is occurring the issue would be serious.
The term ozone depletion can refer to a number of distinct, but related phenomena. Ozone depletion, gradual thinning of earth s ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. Epa ttn naaqs ozone implementation technical resources. Ozone layer depletion is the thinning of the ozone layer present in the atmosphere. It is found largely in the stratosphere that extends from about 6 km at the poles and 17 km at the equator to about 50 km above the earths surface.
Thus, ozone layer depletion has become a major concern among the environmentalists. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a result of increasing pollution. Ozone depletion consists of two related events observed since the late 1970s. This page has links to articles that give overviews or broad information, shorter pieces that focus on specific aspects of ozone depletion, international organizations that issue regular updates, and images and animations of ozone. There is a corresponding hole over the arctic that similarly appears in the spring, although in some years warmer winters there do not result in a major depletion of the ozone layer. What is the procedure of ozone depletion layer answers. There are important effects of changes in the intensity of solar uv radiation resulting from stratospheric ozone depletion, particularly uvb.
Ozone depletion facts and information national geographic. Ozone absorbs a band of ultraviolet radiation called uvb. Our powerpoint presentation about ozone depletion, its effects and its causes. Ozone definition and meaning collins english dictionary. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone. Ozone depletion synonyms, ozone depletion pronunciation, ozone depletion translation, english dictionary definition of ozone depletion. Ozone depletion also explains much of the observed reduction in stratospheric and upper tropospheric temperatures. Ozone depletion is allowing the uv radiation to earth surface. Today, it is a worldwide concern that has been addressed by several international organizations. The evaporation of surface water through the stomata of leaves increases, which results in the decreased moisture content of the soil. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. Ozone depletion simple english wikipedia, the free encyclopedia. The ozone layer protects us from excessive levels of harmful ultraviolet uv radiation. A large area of the ozone layer over antarctica that annually becomes depleted of ozone by the action of chlorofluorocarbons and other pollutants.
How severe is the depletion of the antarctic ozone layer. A class of widely used chemical coolants known as hydrofluorocarbons hfc contributes to ozone depletion by a small but measurable amount, countering a. One chlorine atom can break apart more than 100,000 ozone molecules. A class of widely used chemical coolants known as hydrofluorocarbons hfc contributes to ozone depletion by a small but measurable amount, countering a decadesold assumption, according to a new nasa study. Mar 21, 2020 ozone depletion, gradual thinning of earth s ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. Standard global warming theory predicts that the stratosphere will cool.
One chlorine can destroy 100,000 molecules of ozone. It protects us from harmful uv rays that can have serious effects on animals, biodiversity and peoples health, including skin cancer and eye cataract. The chlorofluorocarbon and the halons are potent ozone depletors. Ozone depletion is caused by natural or man made methods. Ozone is formed by photochemical reaction, followed by three body reaction. List of books and articles about ozone layer online. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. It covers the entire planet and protects life on earth by absorbing harmful ultravioletb uvb radiation from the sun. The ozone layer is a region of the stratosphere containing ozone, or o3 gas.
This timeline highlights the average area of the ozone hole between september 7th and october th as observed by nasa spacedbased instruments see colored bars and scale. Ozone depletion, gradual thinning of earths ozone layer caused by the. Causes of ozone layer depletion and its effects on human. The third body m absorbs the excess energy liberated by the above reaction and there by stabilise the o 3 ozone molecule. Response to court decisions on the nox sip call, nox sip call technical amendments, and section 126 rules pdf february 22, 2002, rulemaking on section 126 petitions from new york and connecticut regarding sources in michigan. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. The latter phenomenon is referred to as the ozone hole. The ozone layer helps to protect life from harmful ultraviolet radiation. Ozone, a form of oxygen consisting of three atoms of oxygen instead of two, is considered an air pollutant when found at ground levels and is a major component of smog. Ozone depletion free download as powerpoint presentation. Ozone depletion is the process of destruction of the ozone layer which can cause adverse effects on the living forms by many pollutants releases out from the vehicles, industries etc. Presentation on ozone depletion linkedin slideshare.
Ultraviolet radiation from the sun breaks up these cfcs. The proteins cells in plants undergo harmful mutations, all due to ultraviolet radiations. Location of stratosphere thermosphere exosphere troposphere mesosphere stratosphere 10 km 40 km 50 km 300 km 400 km. The regulations include reporting and recordkeeping requirements for producers, importers, and exporters of class i and class ii ods. The process continues and the result is the reduction or depletion of ozone in the stratosphere. The ozone saga is an inspiring goodnews story thats. It is formed by the reaction of various air pollutants in the presence of sunlight. The ozonedepletion theory of global warming provides, for the first time, a clear, straightforward explanation for observations not easily explained by. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Following is the list of some of the main ozone depleting substances and the sources from where they are released. A global thinning of the ozone layer results as ozone rich air from the remaining ozone layer flows into the ozone poor. There, it will absorb almost all ultraviolet light which is harmful to many organisms.
Depletion of ozone definition of depletion of ozone by. A close look at the evolution at the life on earth reveals that initially the. Pdf causes of ozone layer depletion and its effects on. Researchers indicate that many of the effects of ozone depletion on human health tend to apply for animals, too. Chlorine atoms react with ozone, starting a chemical cycle that destroys the good ozone in that area. The subtropical ground ozone concentration in northern hemisphere is twice the corresponding region in southern hemisphere 5. Ground ozone concentration is lower in polar and equatorial regions. Ozone is highly corrosive and toxic and is used as a disinfectant. It can be found in small concentrations in the troposphere where it is considered a pollutant. Ozone layer depletion essay sample new york essays. What is ozone depletion and what are steps to control it. Common coolants contribute to ozone depletion nasa.
Epa has issued a series of regulations to phase out the production and import of class i and class ii ozonedepleting substances ods. Ozone in the stratospherea layer of the atmosphere between 15 and 50 kilometers 10 and 31. The initial step in the depletion of stratospheric ozone by human activities is the emission of ozonedepleting gases containing chlorine and bromine at earths surface. The feature of very low ozone concentrations over a very welldefined region. Industries that manufacture things like insulating foams, solvents, soaps. That is why reactionary groups have so quickly and strongly demanded legal changes in a handful of countries. Sometimes this means creating an image that looks much like an aerial photo of the.
Depletion begins when cfcs get into the stratosphere. Project report on ozone depletion environmental pollution. Two decades ago stratospheric ozone depletion was mainly the interest of atmospheric scientists. Ozone o3 is present in 1 ppm in the upper stratosphere, and it absorbs virtually all of the uv radiation from the sun. Destruction of the upper atmospheric layer of ozone gas, caused by substances formed from breakdown of ozone depleting substances. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules. Pdf on jan 1, 2001, md safiuddin and others published global ozone. Information and translations of ozone depletion in the most comprehensive dictionary definitions resource on the web. Ozone depletion describes two distinct but related phenomena observed since the late 1970s.
For examples, lensman999 unknown stresses that the ozone depletion will lead an increase in the percentage of skin cancer and cataracts. A global thinning of the ozone layer results as ozonerich air from the remaining ozone layer flows into the ozonepoor. Therefore, these factors bring a lot of problem on our daily life. Natural cycle of ozone depletion in the stratosphere. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. Handbook for the montreal protocol on substances that deplete. Oct 27, 2017 the effects of ozone depletion on plants and animals massive amounts of uvb radiation that penetrate our atmosphere do not only affect humans, but also animals and plants. Experts blame ozonelayer depletion on manmade chemicals containing chlorine and bromine that are emitted from a.
Ozone depletion definition of ozone depletion by medical. Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. Ozonedepleting substances ods recordkeeping and reporting. The so 2f 2 global background mixing ratio increased during recent decades and had reached about 1. Essay ozone depletion is a serious problem presently facing the world. Effects of ozone depletion ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. The detailed mechanism by which the polar ozone holes form.
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