Many well accredited scientific studies have provided ample evidence for what effects are behind the depletion of the ozone. Ozone o3 depletion does not cause global warming, but both of these. The ozone hole and global warming union of concerned scientists. If you have a user account, you will need to reset your password the next time you login. Thinning of the stratospheric ozone layer has been caused largely by longlived chlorine and bromine compounds, such as. Generally, we find thinning or depletion of the ozone layer to the extent of ozone hole creation over the southern pole i. Ozone depletion free download as powerpoint presentation. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Introduction the ozone layer is a layer in earths atmosphere which.
The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. There are many situations where human activities have. The depletion of ozone in the stratosphere by the number of gaseous pollutants like nitric oxide no, nitrous oxide n 2 o, chlorine cl, chlorofluorocarbons cfcs etc. What are the principal steps in stratospheric ozone depletion caused by human activities. It is found that the ozone layer gets affected by some natural causes that are sunspots and stratospheric winds. Photochemical processes are the principal causes of ozone depletion in the stratosphere. However, various factors have led to the depletion and damage of this protective layer.
The problems and causes associated with ozone depletion arise from human activities. Title vi for stratospheric ozone protection, signed into law. Jan 07, 2016 ozone hole ozone depletion at south pole polar vortex and ozone depletion are two distinct but related phenomena. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Found in industrial solvents, drycleaning agents and hospital sterilants. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. Learn more about the process, causes, and effects of ozone layer depletion. Human activities cause the emission of halogen source gases that contain chlorine and bromine atoms. Causes of ozone layer depletion and its effects on human. However, these cause a very nominal contribution to the ozone layer depletion which is near about 1 to 2 percent and therefore these. The emission of ozone depleting substances has been damaging the ozone layer. Ozone layer is a deep layer in earths atmosphere called stratosphere that contain ozone which is a naturally.
Predominantly, researchers have found that it is the introduction of artificial chemicals created by humans which contain bromine or chlorine. The ozone layer does not form when the temperature of the atmosphere at the location is below 205 f. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Much larger decrease in stratospheric ozone is observed around earths polar regions. Jan 20, 2010 the montreal protocol is an international agreement to address the causes of ozone depletion. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epa. 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. The thinning is most pronounced in the polar regions, especially over antarctica. The proteins cells in plants undergo harmful mutations, all due to ultraviolet radiations. One of the main reasons for the widespread concern about.
The montreal protocol is an international agreement to address the causes of ozone depletion. It contains some videos and gif at thte end from an external source. Ozone layer depletion causes, effects and solutions 7. There are also springtime polar tropospheric ozone depletion. What are the causes and effects of ozone depletion. The absorbed heat causes a temperature inversion between 15 to 50 km.
The ozone layer thus plays an important role by preventing the harmful uv radiations from penetrating into the earths lower atmosphere the troposphere. Ozone depletion consists of two related events observed since the late 1970s. The depletion of the ozone describes two closely related but distinct phenomena which have been repeatedly observed since the latter 1970s. The main cause of ozone depletion and the ozone hole is manufactured chemicals, especially. The chlorofluorocarbon and the halons are potent ozone depletors. The latter phenomenon is referred to as the ozone hole. Nonetheless, since the discovery of ozone depletion, the montreal protocol was established to regulate the manufacture and use of these chemical compounds. Ozone layer depletion is the destruction of ozone gas of upper atmospheric layer stratosphere, caused by substances formed from breakdown of ozonedepleting substances ods. The main ozonedepleting substances ods chlorofluorocarbons cfcs the most widely used ods, accounting for over 80% of total stratospheric ozone depletion. 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. The ozone layer protects humans, animals, and plants from harmful ultraviolet rays. The ozone layer is mainly found in the lower portion of the stratosphere.
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. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. Ozone depletion and climate change environment canada. Pdf causes of ozone layer depletion and its effects on human.
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. In addition, the sources of ozone depleting substances and the mechanism of ozone depletion have been. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. Ozone layer and causes, effects and solutions to ozone depletion. Causes of ozone depletion ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is tipped in favour of destruction.
Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a result of increasing pollution. Pdf causes of ozone layer depletion and its effects on. Ozone o3 is a stratospheric layer that plays important role in providing support to humans for their survival. The severe depletion of the ozone layer in any particular area is called ozone hole.
Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a. Ozone layer and causes, effects and solutions to ozone. Uvc during the antarctic spring causes deleterious effects. Ozone in the stratospherea layer of the atmosphere between 15 and 50. There have been several concerns about ozone depletion. Ozone layer depletion cause, effects, and solutions. Ozone depletion atmospheric ozone layer depletion is a serious problem currently facing the world. By absorbing uv radiation the ozone layer heats up the atmosphere. Sep 20, 2016 ozone depletion ozone layer depletion, is simply the wearing out reduction of the amount of ozone in the stratosphere. The ozone layer helps to protect life from harmful ultraviolet radiation. Ozone depletion is largely a result of manmade substances. It is an essential factor for many global, biological and environmental phenomena. What emissions from human activities lead to ozone depletion. Ozone layer depletion leads to decrease in ozone in the stratosphere and increase in ozone present in the lower atmosphere.
Money and time are being spent on ozone repair, but the problem still exists. Dec 02, 2014 the main ozone depleting substances ods chlorofluorocarbons cfcs the most widely used ods, accounting for over 80% of total stratospheric ozone depletion. 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. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. Following is the list of some of the main ozone depleting substances and the sources from where they are released. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. Ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is tipped in favour of destruction. Causes, effects and solutions of ozone layer depletion.
The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the earths atmosphere. Ozone depletion is allowing the uv radiation to earth surface. 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. Project report on ozone depletion environmental pollution. Ozone layer essay ozone depletion causes and effects. Below is the detailed account of the chemicals responsible for the ozone layer depletion. Ozone in the lower atmosphere contributes to global warming and climate change. 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 is destroyed in photochemical reactions with ozone depleting substances. Chlorofluorocarbons cfcs chlorofluorocarbons cfcs are the primary cause for the ozone layer depletion. What emissions from human activities lead to ozone. Ozone depletion facts and information national geographic. Pdf on jan 1, 2001, md safiuddin and others published global ozone depletion. Ozone layer depletion definition, causes, solutions toppr.
People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the earths surfacewhere it causes health problems, from eye damage to skin cancer. Jul 16, 2008 the term ozone hole refers to the depletion of the protective ozone layer in the upper atmosphere stratosphere over earths polar regions. Ozonedepleting substances are compared in their effectiveness to destroy stratospheric ozone using the ozone depletion potential odp, as listed in table q71 see q18. Sep 30, 2019 the ozone layer has historically protected the earth from the harmful uv rays, although in recent decades this protection has diminished due to stratospheric ozone depletion. Presence of ozone in the lower atmosphere is considered as a pollutant and a greenhouse gas. Natural causes of ozone depletion ozone depletion describes two distinct, but related observations. What is an ozone hole and causes and effects of ozone depletion.
The ozone layer has historically protected the earth from the harmful uv rays, although in recent decades this protection has diminished due to stratospheric ozone depletion. A gas with a larger odp has a greater potential to destroy ozone over its. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in.
The main effect of ozone depletion is an increase in uvb rays reaching the earths surface causes. Ozone depletion causes increases in uv rayss effects on aquatic ecosystems by. Ozone layer depletion causes and effects of ozone layer. It is revealed that introduction of chlorof lourocarbons cfcs in the environment is the most rated cause of said depiction. First if it was cfcs the one location on earth that would have the absolutely lowest l. The ozone layer protects living things from harmful ultraviolet rays from the sun.
Used as coolants in refrigerators, freezers and air conditioners in buildings and cars manufactured before 1995. What is an ozone hole and causes and effects of ozone. Ozone reduction in troposphere drastically changes the weather elements like temperature, wind pattern, precipitation etc. The thinning or reduction of ozone depletion is most prominent in the polar regions, especially over antarctica. Ozone depletion ozone layer depletion, is simply the wearing out reduction of the amount of ozone in the stratosphere. There is a steady decline of about 4% in the total volume of ozone in earths stratosphere. Ozone layer depletion, its causes and its effects scribd. The ozone hole and global warming union of concerned. Presentation on ozone depletion linkedin slideshare. It is region of the atmosphere from 19 to 48 kms above the earth surface. These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. Causes and effects of ozone layer depletion that are.
These gaseous pollutants react with the ozone to produce oxygen by which the net result is the depletion of ozone. As explained above, the overall cause of ozone depletion is the. Ozone hole ozone depletion at south pole polar vortex and ozone depletion are two distinct but related phenomena. Human activities cause ozone depletion and global warming. While several substances were addressed, chcs and hcfcs were the main ones that the international. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. Causes of ozone depletion in the stratosphere studies have argued that the influence of 7,500 tons of chlorine from cfc amounting annually to the stratosphere is minimal compared to 600 million tons of chlorine and fluorine other aggressive gas like salts escaping oceans as aerosols. Causes of ozone layer depletion the main things that lead to destruction of the ozone gas in the ozone layer. The ozone layer is mainly found in the lower portion of the stratosphere, about 20 to 30 km 12 to 19 miles above the earth, though the thickness varies seasonally and geographically. Ozone depletion ozone depletion chlorofluorocarbon.
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