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