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. 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. Questions and answers about the environmental effects of the ozone layer depletion and. However, various factors have led to the depletion and damage of this protective layer. Unlike pollution which has several causes, there is one specific chemical compound that is responsible for the breakdown of the ozone layer. The ozone layer typically occurs in the stratosphere and is naturally. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epaapproved alternatives to ozonedepleting substances, and sun safety. The first one has been a slow, but steady ozone depletion of. Ozone layer depletion causes, effects and solutions 7.
The ozone layer depletion is a major concern and is associated with a number of factors. Approximately 90 percent of the atmospheres ozone occurs from 1018 km 611 miles to about 50 km about 30 miles above earths surface. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. Ozone is harmful at ground level but high up the atmosphere ozone layer plays a vital role in the protection of all living beings. It is present in traces less than 1 ppm in the atmosphere. What are the mechanisms of ozone depletion environmental. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. Addressing ozone layer depletion ozone layer protection.
Pdf causes of ozone layer depletion and its effects on. The main causes responsible for the depletion of the ozone layer are listed below. Ozone depletion and climate change environment canada. The cfc emissions are on the top in causing the ozone layer hole approximately up to 80% of the entire ozone depletion. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone layer, of about 4%, per decade. 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. Ozone is a gas that is present in the ozone layer in the stratosphere of the earth. The layer shields the entire earthfrom much of the harmful ultravioletradiation that comes from the sun.
The ozone layer prevents most harmful uv wavelengths of ultraviolet light uv. Ozone depletion is allowing the uv radiation to earth surface. Ozone depletion is the term commonly used to describe the thinning of the ozone layer in the stratosphere. Case study on ozone layer free download as powerpoint presentation. Ozone depletion simple english wikipedia, the free. Causes of ozone depletion there are two different types of ozone depletion, both are very similar. The role of sunlight in ozone depletion is the reason why the antarctic ozone.
The problems and causes associated with ozone depletion arise from human activities. No, ozone depletion itself is not the principal cause of climate change. It causes hole in ozone layer which is called ozone hole. The ozone layer is a belt of the naturallyoccuring gas ozone that sits at an altitude. However, because ozone absorbs solar radiation and is a greenhouse gas, ozone changes and climate change are. All ozone depleting chemicals contain chlorine and bromine 10. Chlorofluorocarbons or the cfc are the main cause of ozone layer depletion. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. Ozone layer depletion cause, effects, and solutions. What is important to keep in mind is the fact that prevention of ozone layer depletion is so very important because it directly affects the well being of the people.
Newly detected ozonedepleting substances in the atmosphere pdf. Ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is disturbed. Environmental effects of ozone depletion montreal protocol. Causes, effects and solutions of ozone layer depletion. The latest ozone layer depletion news is included at the foot of the page. The furthest layer, the mesosphere, is found roughly 50 km to 80 km above sea level.
Project ozone layer depletion pdf the stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. Human health effects include the incidence of skin cancer, cataracts and an impairment of the immune system. The ozone layer was discovered in 19 by the french physicists. Ozone depletion consists of two related events observed since the late 1970s. At the end of 20, 258 projects have been committed for an. Ozone layer protection european commission europa eu. Scribd is the worlds largest social reading and publishing site. The world meteorological or ganization wmo, 1995 predicted that the depletion of the ozone layer peaked around 1998 and the layer would slowly recover by 2045 12. The sun propagates ultraviolet radiations which as an adverse effect on living beings. Thinning of the stratospheric ozone layer has been caused largely by longlived chlorine and bromine compounds, such as. The earths ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30. What effects does the depletion of ozone have on environmental processes and cycles. Life on earth has been protected for thousands of years with a vital layer of poison in the atmosphere.
Dec 7, 2016 the ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from. Protecting the ozone layer department of the environment. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. Dramatically every spring you may have heard this called the ozone hole. 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. What we all need to understand is the idea that we all are going to. Ozone depletion occurs when the natural balance between the production and destruction of ozone in the stratosphere is tipped in favor of destruction. Thus, ozone layer depletion has become a major concern among the environmentalists. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Find out what caused the ozone hole, and how the 1989 montreal. The thinning is most pronounced in the polar regions, especially over antarctica. Ozone and environment ozone o3 a gas composed of three atoms of oxygen bluish gas that is harmful to breathe nearly 90% of the earths ozone is in the stratosphere and is referred to as the ozone layer ozone absorbs a band of ultraviolet radiation called uvb ozonedepleting substances ods. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth.
One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in. Ozone depletion greenhouse gases and climate change. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. The ozone layer is a protective shield that blocks the suns harmful ultraviolet rays. Although natural phenomenon can cause ozone depletion but human activities such as cfcs are now accepted as major cause of depletion 9. But many researchers do not agree with these predictions,14 and express their. This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. Experts blame ozonelayer depletion on manmade chem icals containing. The ozone layer and its depletion linkedin slideshare. International undertakings under the 1987 mon treal protocol promise.
Industries that manufacture things like insulating foams, solvents, soaps, cooling things like air conditioners. Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the earths atmosphere. The ozone layer is a belt of naturally occurring ozone gas that sits 9. B dobson inferred correctly that the cause of the warm stratosphere was heating by the absorption of ultraviolet solar radiation by ozone, and he set out to. Case study depletion of ozone in the atmosphere the work of g. The chlorofluorocarbon and the halons are potent ozone depletors. Students explore the causes and effects of the earths ozone holes through discussion and an. Causes and effects of ozone layer depletion that are painfully. What are the mechanisms of ozone depletion environmental sciences essay. Ozone o3 is a stratospheric layer that plays important role in providing support to humans for their survival. The lack of air movement can result in a temperature inversion which causes a layer of still warm air to cover a layer of cool air, trapping any pollutants below the warm layer near ground level. The natural distribution of ozone around the earth is.
The term ozone depletion can refer to a number of distinct, but related phenomena. Stratospheric ozone depletion, ultraviolet radiation and health. There have been several concerns about ozone depletion. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. Cfcs are one of the major causes of ozone layer depletion. Learn more about the process, causes, and effects of ozone layer depletion. The harmful uv rays can reach the earth surface directly and causes skin cancer, blood cancer etc.
Ozone depletion in the stratosphere and increases in greenhouse gases in the troposphere are both subjects of growing concerneven alarmamong scientists. It can cause rise in temperature of the earth surface consequently leading to global warming. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride, and methyl. Causes of ozone layer depletion the main things that lead to destruction of the ozone gas in the ozone layer. There are natural processes that create and destroy ozone in the stratosphere. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Ozone depletion causes of ozone layer depletion earth. This is the cause for the nearly 80% of the ozone depletion. Although natural phenomena can cause temporary ozone loss, chlorine and bromine released from manmade compounds such as cfcs are now accepted as the main cause of this. There are many situations where human activities have. Causes of ozone layer depletion and its effects on human.
Is depletion of the ozone layer the principal cause of climate change. 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. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. Causes and effects of ozone layer depletion that are. In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an electric field. 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. B dobson and other scientists in measuring concentrations of chloride and ozone in the atmosphere g. It is an essential factor for many global, biological and environmental phenomena. This layer serves as a shield that protects the earth from harmful ultraviolet radiation from the sun. Ozone layer depletion, its causes and its effects scribd. The ozone layer lies approximately 1540 kilometers 1025 miles above the earths surface, in the stratosphere. By knowing the statistics about ozone layer depletion, we can keep working hard at restoring our planet so that it is available for future generations to enjoy. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in the amounts of ultraviolet radiation received at the surface of the earth and the effect of this on human health.
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