Mar 21, 2020 ozone depletion, gradual thinning of earths ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. The ozone layer is a layer of ozone high up in the earths atmosphere stratosphere, between approximately 10 kilometres and 50 kilometres above earths surface. Questions and answers about the environmental effects of the ozone layer depletion and climate change. The latter phenomenon is referred to as the ozone hole. List of books and articles about ozone layer online. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction.
Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Ozone in the upper atmosphere absorbs uv radiations of short wavelength and release atomic oxygen. Scientists said the finding of the chemicals circulating in the atmosphere showed ozone depletion is. The thinning is most pronounced in the polar regions, especially over antarctica. It makes a layer in the atmosphere which acts as a cover to the earth against ultraviolet radiation of the sun. Let us see some of the important causes and effects of ozone layer depletion. Evidence of ozone depletion in the stratosphere began to appear in the 1980s. It protects our planet from the destructive effect of ultraviolet radiation. Pdf ozone o 3 is a stratospheric layer that plays important role in providing support. Apr 3, 2014 this pin was discovered by sandra gonzalez. The ozonedepleting effect of refrigerants is important, because the ozone layer filters out ultraviolet uv radiation, which might otherwise reach the surface of the earth. Human activities and ozone layer free download as powerpoint presentation.
Ozone layer research and technical resources us epa. All the questions on this quiz are based on information that can be found at earth science. Ozone depletion is allowing the uv radiation to earth surface. Jun 27, 2017 the ozone layer is the part of the earths atmosphere which contains relatively high concentrations of ozone o3. Pinatubo in 1991 which have occurred since we started monitoring ozone with satellites in the late 1970s, could have also contributed to the. Ozone in the ozone layer is formed by the action of solar ultraviolet light on oxygen. In a small population based study in the north of finland, working outdoors was. The present document contains key summaries from the scientific assessment of ozone depletion. The ozone layer prevents most ultraviolet uv and other highenergy radiation from penetrating to the earths surface but does. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. Ozone layer depletion causes increased uv radiation levels at the earths surface, which is damaging to human health. Another potential reason might be that rising emissions of short lived chemicals are reaching the lower stratosphere and destroying ozone. The upper layer of the atmosphere surrounded by ozone 15 to 30 kms is known as ozonosphere. Ozone layer depletion and its effects 1575 words 7 pages.
Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. We provide reading comprehension exercises with answers. The thinning or reduction of ozone depletion is most prominent in the polar regions, especially over antarctica. The natural distribution of ozone around the earth is. Ozone depletion essay example ozone layer is a thin layer that is located within the stratosphere and contains high concentration of ozone. Both are essential for life but air also protects all of us and it is therefore understandable that the response to the depletion of the ozone layer became international. Like sunscreen for our planet, the ozone layer absorbs most of the harmful radiation and protects us. The emission of ozonedepleting gases impacted the earths ozone layer a layer that. The montreal protocol on substances that deplete the ozone layer committed signatories to phasing out halogenated compounds that damage ozone including cfcs, hydrochlorofluorocarbons and brominecontaining hydrocarbons in order to bring down atmospheric levels of chlorine and bromine and mitigate further ozone depletion. Finally, the short term or intraday consistency is also studied to identify. Stratospheric ozone depletion, ultraviolet radiation and health. This article was published in 1996 and has not been updated.
Timeline of stratospheric ozone depletion and observations. Ozone depletion and climate change environment canada. Ozone depletion ozone depletion ozone layer recovery. Frederick, in encyclopedia of atmospheric sciences second edition, 2015. Ozone depletion consists of two related events observed since the late 1970s.
Over the last few years, the layer had been deteriorated tremendously. But many researchers do not agree with these predictions,14 and express their. Scientific assessment of ozone depletion montreal protocol. Approximately 90 percent of the atmospheres ozone occurs from 1018 km 611 miles to. Nations have been working to reduce ozone depleting chemicals since the 1980s, but recent studies show that there is still work. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. The ozone layer that protects people from the suns ultraviolet radiation is not recovering over most highly populated regions, scientists warned on tuesday. The ozone layer resides in the stratospheric layer of the earths atmosphere. Causes of ozone layer depletion and its effects on human. 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. Ozone layer is recovering in rare good news for the planet the ozone layer above antarctica has recovered so much that it is proving to be a strong fighter against climate change in. 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. The chlorofluorocarbon and the halons are potent ozone depletors.
Human activities that can damage or affect the ozone. The ozone layer or ozone shield is a region of earths stratosphere that absorbs most of the suns ultraviolet radiation. The ultraviolet uv rays emitted from sun are captured by ozone and thereby provide a stable ontological structure in the biosphere. However, this ozone layer is destroyed by cfc gases, which are used in aerosol cans, refrigerators, air conditioners, industrial solvents, etc.
This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. Chapte r ozone depletion potentials, global warming. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a result of increasing pollution. There are two more important hazards which are posing challenges to future existence of our civilization are green house effect and ozone depletion. Chlorofluorocarbon cfc banks from uses such as air conditioners or foams can be emitted after global production stops.
Depletion of this layer by ozone depleting substances ods will lead to higher uvb levels, which in turn will cause increased skin cancers and cataracts and potential damage to some marine organisms, plants, and plastics. Ozone depletion, gradual thinning of earths ozone layer caused by the release of chemical compounds. Download a pdf of ozone depletion, greenhouse gases, and climate change by the national research council for free. This passage is all about the ozone layer and the ozone layer restricts. Low temperatures, increase in the level of chlorine and bromine gases in the upper stratosphere are some of the reasons that leads to ozone layer depletion. Ozone depletion describes the observed loss of ozone in the stratosphere over the past 50 years. This layer envelops the earths atmosphere and helps protect life on earth. Access information on research and technical resources related to ozone layer science. According to scientists of aryabhatta observational science research institute, due to excess cold in winter, the hole of ozone layer has increased. It is an essential factor for many global, biological and environmental phenomena. Gwps including indirect effects of ozone depletion have been estimated fo r a variety of halocarbons cfcs, halons, hcfcs, etc. Ozone layer research and technical resources ozone layer. Questions and answers about the environmental effects of the ozone layer depletion and.
The depletion of the ozone layer 1593 words 7 pages. Protecting the ozone layer and reducing global warming undp. Concerns over depletion of the ozone layer arose in the 1970s, when scientists realized that chemicals released by various anthropogenic activities could lead to a slow decline in ozone amounts in the stratosphere. The lower stratospheres ozone continues to decrease, despite the worlds success in phasing out ozonedepleting chemicals. Ozone layer depletion fueled by falling temperature in the stratosphere can be termed as yet another hazardous effect of global warming on the earth.
Scientists determined in the 1970s that it is caused by ozone depleting substances odss, particularly by the use of chlorofluorocarbons cfcs. Learn what cfcs are, how they have contributed to the ozone hole, and how the 1989 montreal. Ozone layer depletion daily current affair article for upsc, ias, civil services and state pcs examinations context. Ozone holes are popular names for areas of damage to the ozone layer. Unfortunately, cfcs can eventually find their way into the earths atmosphere and the ozone layer. Ozone layer is a protective stratospheric layer, also known as ozone umbrella. Ozone layer depletion cause, effects, and solutions. Apr 20, 2018 earths ozone layer shields us from harmful ultraviolet radiation. Once they get there they destroy ozone molecules and cause the ozone layer to become depleted or thinner. The recognition of the dangers presented by chlorine and bromine to the ozone layer spawned an international effort to restrict the production and the use of cfcs and other halocarbons. Ozone layer depletion ozone layer depletion is the gradual thinning of the earths ozone layer in the upper atmosphere caused due tho release of chemical compounds containing gaseous bromine or chlorine from industries or other human activities.
For webquest or practice, print a copy of this quiz at the earth science. Ensuring that no new chemicals or technologies emerge that could pose new threats to the ozone layer e. Ozone o3 is a stratospheric layer that plays important role in providing support to humans for their survival. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. Ian grimmond ozone layer depletion when you walk outside, there is a pale blue molecule up in the stratosphere that is protecting you every second of every day of your life, this molecule is called ozone. The severe depletion of the ozone layer in any particular area is called ozone hole. Feb 12, 2018 far above earths surface, the ozone layer helps to protect life from harmful ultraviolet radiation.
Approximately 90 percent of the atmospheres ozone occurs from 1018 km 611 miles to about 50 km about 30 miles above earths surface. The 1987 montreal protocol on substances that deplete the ozone layer began the phaseout of cfcs in 1993 and sought to achieve a 50 percent reduction in. Rivm report 481505011 technical report on stratospheric ozone. The net gwps of halocarbons depend strongly upon the effectiveness of each compound for ozone destruction. The full assessment report will be part of the information upon which the parties to the united nations montreal protocol will base their future decisions regarding protection of the stratospheric ozone layer. Let us have a detailed look at the various causes and effects of ozone layer depletion. It contains high concentration of ozone o 3 in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.
Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. The ozone layer helps to protect life from harmful ultraviolet radiation. This is an open access article distributed under the creative commons attribution license. Questions and answers about the environmental effects of. 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. Evidence of illegal emissions of ozonedepleting chemicals. Depletion of ozone layer is also causing the problem of food shortage to humans.
It encompasses both a steady thinning of the ozone layer at midlatitudes and its catastrophic. Ozone layer is recovering in rare good news for the planet. The exact amount of ozone varies, depending on the seasons and the location. Reading skills get sharpened by unseen passage reading comprehension test. In the section above we provide data on global emissions of ozonedepleting substances. A layer of ozone in the lower stratosphere protects all life on earth from harmful ultraviolet uv radiation. Ozone layer depletion daily current affair article for. Cfcs get banned in 1974 scientists sherry rowland and mario molina discovered the link between the depletion of the ozone layer and cfcs. In this paper we will attempt to examine the relationship between global warming and ozone layer depletion, subsequently try to. Uv radiations are disturbing developmental and physiological processes which is decreasing the productivity of crops. In the 1970s, people all over the world started realizing that the ozone layer was getting thinner and that this was a bad thing.
Ozone layer depletion causes, effects and solutions 7. It acts as a protective shield for the man, animals and. Ozone concentration differs by about 10 ppm in stratosphere compared to 0. Various anthropogenic activities such as emissions of cfcs, hcfcs. This is a phenomenon characterized by warming of the earths atmosphere resulting from absorption of infrared radiation from atmospheric constituents. This layer absorbs between 93 and 99 per cent of the ultraviolet radiation from the sun. Ozone layer simple english wikipedia, the free encyclopedia. Dec 16, 20 ozone depletion is a chemical thinning of the ozone layer in the stratosphere or upper atmosphere. Project report on ozone depletion environmental pollution. Ozone layer damage is more like a really thin patch than a hole. International journal of environmental science and development, vol.
The main things that lead to destruction of the ozone gas in the ozone layer. It is postulated that the combined effect of aircraft halogen nitrate fertilizers and effluent would considerable depletion of the ozone layer and could result in an increase in ultraviolet radiation reaching the. Specifically, article 6 of the montreal protocol on substances that deplete the ozone layer states. Ozone depletion facts and information national geographic. This radiation could have seriously damaging effects on germinating crops and on the photoplankton of the oceans. By the usual definition, stratospheric ozone depletion is not an integral part of the. This page provides links to research efforts led by organizations such as the national oceanic and atmospheric administration, the united nations environment program, an. This natural mechanism however do not really upset the equilibrium of ozone, because atmospheric oxygen absorbs uv radiation of wavelength of shorter than 240nm and photodissociates into two. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. In the section above we provide data on global emissions of ozone depleting substances. The layers which occupy the lower part of the atmosphere removes the unwanted pollutants from the earths surface.
Ozone depletion and climate change, or ozone hole and global warming in more popular terms, are environmental challenges whose connections have been explored and which have been compared and contrasted, for example in terms of global regulation, in various studies and books. Short term losses of ozone can be much greater than the long term average. Ozone layer, region of the upper atmosphere, between roughly 15 and 35 km 9 and 22 miles above earths surface, containing relatively high concentrations of ozone molecules. Pdf causes of ozone layer depletion and its effects on. Relatively high means a few parts per million much higher than the.
Each of these atoms would be able to destroy many ozone molecules in catalytically driven cycles, thus posing a threat to the ozone layer 3, which protects life. Pdf depletion of the ozone layer and its consequences. Finally, the short term or intraday consistency is also studied to identify the effect of. Changes in atmospheric ozone amounts and ultraviolet radiation. Ozone layer depletion is the thinning of ozone layer that protects the earth from the harmful uv radiations.
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