Causes of ozone layer depletion and its effects on human. The ozone saga is an inspiring goodnews story thats. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. If ozone depletion at high altitudes is occurring the issue would be serious. The feature of very low ozone concentrations over a very welldefined region. Ozone layer depletion cause, effects, and solutions. Sometimes this means creating an image that looks much like an aerial photo of the. 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. A large area of the ozone layer over antarctica that annually becomes depleted of ozone by the action of chlorofluorocarbons and other pollutants. The third body m absorbs the excess energy liberated by the above reaction and there by stabilise the o 3 ozone molecule.
Ozone absorbs a band of ultraviolet radiation called uvb. The subtropical ground ozone concentration in northern hemisphere is twice the corresponding region in southern hemisphere 5. Following is the list of some of the main ozone depleting substances and the sources from where they are released. Standard global warming theory predicts that the stratosphere will cool. The evaporation of surface water through the stomata of leaves increases, which results in the decreased moisture content of the soil. Ozone layer depletion essay sample new york essays. The so 2f 2 global background mixing ratio increased during recent decades and had reached about 1. Industries that manufacture things like insulating foams, solvents, soaps. The regulations include reporting and recordkeeping requirements for producers, importers, and exporters of class i and class ii ods. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone. The ozone layer helps to protect life from harmful ultraviolet radiation. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. 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. The ozone layer protects humans, animals, and plants from harmful ultraviolet rays.
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. Depletion of ozone definition of depletion of ozone by. It can be found in small concentrations in the troposphere where it is considered a pollutant. How severe is the depletion of the antarctic ozone layer. Ozone o3 is present in 1 ppm in the upper stratosphere, and it absorbs virtually all of the uv radiation from the sun. 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. Ozone in the stratospherea layer of the atmosphere between 15 and 50 kilometers 10 and 31. Ground ozone concentration is lower in polar and equatorial regions. The ozonedepletion theory of global warming provides, for the first time, a clear, straightforward explanation for observations not easily explained by. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9.
Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a result of increasing pollution. Epa has issued a series of regulations to phase out the production and import of class i and class ii ozonedepleting substances ods. Information and translations of ozone depletion in the most comprehensive dictionary definitions resource on the web. One chlorine can destroy 100,000 molecules of ozone. Natural cycle of ozone depletion in the stratosphere. The ozone layer protects us from excessive levels of harmful ultraviolet uv radiation. 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. Two decades ago stratospheric ozone depletion was mainly the interest of atmospheric scientists. Today, it is a worldwide concern that has been addressed by several international organizations. Ozone layer depletion is the thinning of the ozone layer present in the atmosphere. It covers the entire planet and protects life on earth by absorbing harmful ultravioletb uvb radiation from the sun. Location of stratosphere thermosphere exosphere troposphere mesosphere stratosphere 10 km 40 km 50 km 300 km 400 km. 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. Ozone depletion also explains much of the observed reduction in stratospheric and upper tropospheric temperatures.
Protecting the ozone layer department of the environment. For examples, lensman999 unknown stresses that the ozone depletion will lead an increase in the percentage of skin cancer and cataracts. Ozone depletion describes two distinct but related phenomena observed since the late 1970s. What is the procedure of ozone depletion layer answers. Experts blame ozonelayer depletion on manmade chemicals containing chlorine and bromine that are emitted from a. Ozonedepleting substances ods recordkeeping and reporting. It protects us from harmful uv rays that can have serious effects on animals, biodiversity and peoples health, including skin cancer and eye cataract.
One chlorine atom can break apart more than 100,000 ozone molecules. The thinning is most pronounced in the polar regions, especially over antarctica. Ozone is highly corrosive and toxic and is used as a disinfectant. 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 free download as powerpoint presentation. What is ozone depletion and what are steps to control it. Therefore, these factors bring a lot of problem on our daily life. Chlorine atoms react with ozone, starting a chemical cycle that destroys the good ozone in that area. Ozone depletion facts and information national geographic. 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. Ozone depletion is caused by natural or man made methods. Ozone is formed by photochemical reaction, followed by three body reaction.
Understanding that global warming is caused by ozone depletion, not greenhouse gases, has major implications for investments in energy. Ozone is ozone is a form of oxygen with 3 oxygen atoms o3. The detailed mechanism by which the polar ozone holes form. Revision of definition of applicable requirement for title v operating. Money and time are being spent on ozone repair, but the problem still exists. Ozone is a colourless gas which is a form of oxygen. A class of widely used chemical coolants known as hydrofluorocarbons hfc contributes to ozone depletion by a small but measurable amount, countering a. Presentation on ozone depletion linkedin slideshare. The term ozone depletion can refer to a number of distinct, but related phenomena. Common coolants contribute to ozone depletion nasa. Thus, ozone layer depletion has become a major concern among the environmentalists.
Pdf causes of ozone layer depletion and its effects on. A global thinning of the ozone layer results as ozonerich air from the remaining ozone layer flows into the ozonepoor. Its consequences, the causal debate, and international cooperation number 6 february 8, 1988 since the announcement of a thinning of the ozone layer over the antarctic by uk scientists in 1985, world attention has been focusing on the causes of this phenomenon. That is why reactionary groups have so quickly and strongly demanded legal changes in a handful of countries. Ozone depletion over india with so much worry about the rapid ozone depletion taking place in various parts of the earth, indian scientists are closely monitoring the ozone layer over india for possible depletion trends. Essay ozone depletion is a serious problem presently facing the world. Pdf on jan 1, 2001, md safiuddin and others published global ozone. It is formed by the reaction of various air pollutants in the presence of sunlight. The ozone layer is a region of the stratosphere containing ozone, or o3 gas. Our powerpoint presentation about ozone depletion, its effects and its causes.
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. Project report on ozone depletion environmental pollution. Ozone depletion simple english wikipedia, the free encyclopedia. Ozone depletion definition of ozone depletion by medical. Handbook for the montreal protocol on substances that deplete. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules. There are important effects of changes in the intensity of solar uv radiation resulting from stratospheric ozone depletion, particularly uvb. The process continues and the result is the reduction or depletion of ozone in the stratosphere. My teaching and textbook1 have always covered many physicsrelated social issues, including stratospheric ozone depletion and global warming. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. 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.
Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. Ozone definition and meaning collins english dictionary. Depletion begins when cfcs get into the stratosphere. Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer.
The chlorofluorocarbon and the halons are potent ozone depletors. 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. A global thinning of the ozone layer results as ozone rich air from the remaining ozone layer flows into the ozone poor. Progress report 2003 united nations environment programme, environmental e. List of books and articles about ozone layer online. Ozone depletion synonyms, ozone depletion pronunciation, ozone depletion translation, english dictionary definition of ozone depletion.
Ozone depletion is allowing the uv radiation to earth surface. The proteins cells in plants undergo harmful mutations, all due to ultraviolet radiations. Ozone depletion definition of ozone depletion by the free. Epa ttn naaqs ozone implementation technical resources. 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.
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. Ozone depletion, gradual thinning of earths ozone layer caused by the. Ultraviolet radiation from the sun breaks up these cfcs. The science of ozone depletion ozone depletion is the result of a complex set of circumstances and chemistry. Ozone depletion ozone layer depletion, is simply the wearing out reduction of the amount of ozone in the stratosphere. If our ozone the vitality of our very existences is not protected then we are ultimately doomed. There, it will absorb almost all ultraviolet light which is harmful to many organisms. The latter phenomenon is referred to as the ozone hole. Researchers indicate that many of the effects of ozone depletion on human health tend to apply for animals, too.
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