Chlorofluorocarbons ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is disturbed. 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. Although natural phenomenon can cause ozone depletion but human activities such as cfcs are now accepted as major cause of depletion 9. Causes, effects and solutions of ozone layer depletion. The main ozonedepleting substances ods chlorofluorocarbons cfcs the most widely used ods, accounting for over 80% of total stratospheric ozone depletion. Ozone layer depletion causes, effects and solutions 7. Humans rely heavily on the absorption of ultraviolet b rays by the ozone layer because uvb radiation causes skin cancer and can lead to genetic damage. This helps you give your presentation on depletion of ozone layer in a conference, a school lecture, a business proposal, in a webinar and business and professional representati. 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.
Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. There, it will absorb almost all ultraviolet light which is harmful to many organisms. The clcatalyzed ozone depletion is dramatically enhanced in the presence of polar stratospheric clouds pscs finally this how polar vortex leads to ozone depletion polar stratospheric clouds convert reservoir compounds into reactive free radicals cl and clo. A single atom of chlorine from a cfc can destroy 100,000 or more molecules of ozone. Front matter causes and effects of stratospheric ozone. These free radicals deplete ozone as shown in the animation below.
The ozone layer thus plays an important role by preventing the harmful uv radiations from penetrating into the earths lower atmosphere the troposphere. Ozone layer depletion essay sample free college essay. There have been several concerns about ozone depletion. This depletion makes humans more vulnerable to the uvb rays which are known to cause skin cancer as well as other genetic deformities. It has been found that this protective ozone layer is getting depleted because of the presence of cfc chlorofluorocarbon compounds. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epa. Ozone layer depletion, its causes and its effects free download as powerpoint presentation. Natural causes of ozone depletion ozone depletion describes two distinct, but related observations. Learn more about the process, causes, and effects of ozone layer depletion. Sep 30, 2019 humans rely heavily on the absorption of ultraviolet b rays by the ozone layer because uvb radiation causes skin cancer and can lead to genetic damage. Ozone depletion free download as powerpoint presentation. The bestknown and most abundant of the ods are the cfcs. Ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is tipped in favour of destruction.
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. Ppt ozone layer depletion powerpoint presentation free. Ozone layer depletion, its causes and its effects scribd. The ozone layer is a belt of the naturallyoccuring gas ozone that sits at an altitude of between 15 and 30 kilometers above the earth. Ozone layer and causes, effects and solutions to ozone depletion. Additional copies may be obtained, free of charge, from. However, various factors have led to the depletion and damage of this protective layer. The production and emission of chlorofluorocarbons cfcs, is the leading cause of ozone layer depletion. Used as coolants in refrigerators, freezers and air conditioners in buildings and cars manufactured before 1995.
This helps you give your presentation on depletion of ozone layer in a conference, a school lecture, a business proposal, in a webinar and business and professional representations. The main causes responsible for the depletion of the ozone layer are listed below. 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 reason is the release of chlorofluorocarbons cfcs and halon gases in the atmosphere formerly found in aerosol spray cans and refrigerants. The ozone layer is mainly found in the lower portion of the stratosphere. Ozone depletion only stops when the chlorine randomly reacts with another molecule to form a longlived, stable substance. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction.
Let us see some of the important causes and effects of ozone layer depletion. This is the cause for the nearly 80% of the ozone depletion. At that point, it is no longer free to react with ozone. Ozone layer depletion is the destruction of ozone gas of upper atmospheric layer stratosphere, caused by substances formed from breakdown of. This bad ozone forms when sunlight initiates chemical reactions in the. When cfc is released into the atmosphere, they mix with atmospheric. Another misconception is that ozone layer depletion causes global warming by letting in extra. The chlorofluorocarbon and the halons are potent ozone depletors. The questions address the nature of atmospheric ozone, the chemicals that cause ozone deple tion, how global and polar ozone depletion occur, the extent of.
The ozone layer does not form when the temperature of the atmosphere at the location is below 205 f. If interested, you can purchase this powerpoint from. Ozone layer and causes, effects and solutions to ozone. However, near the surface where we live and breathe, ozone is a harmful pollutant that causes damage to lung tissue and plants. There are also springtime polar tropospheric ozone depletion. Causes of ozone layer depletion the main things that lead to destruction of the ozone gas in the ozone layer. Depletion of ozone definition of depletion of ozone by.
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. Pdf on jan 1, 2001, md safiuddin and others published global ozone depletion. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. Protection against depletion of stratospheric ozone by chlorofluorocarbons. However, these cause a very nominal contribution to the ozone layer depletion which is near about 1 to 2 percent and therefore these. What is the ozone layer and what causes ozone depletion. Protection against depletion of stratospheric ozone by. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone layer, of about 4%, per decade. The main effect of ozone depletion is an increase in uvb rays reaching the earths surface. Jan 07, 2016 the clcatalyzed ozone depletion is dramatically enhanced in the presence of polar stratospheric clouds pscs finally this how polar vortex leads to ozone depletion polar stratospheric clouds convert reservoir compounds into reactive free radicals cl and clo. The main effect of ozone depletion is an increase in uvb rays reaching the earths surface causes. The latter phenomenon is referred to as the ozone hole.
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. 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 layer protection european commission europa eu. Unlike oxygen o2, ozone has a strong scent and is blue in color.
Jan 20, 2010 the montreal protocol is an international agreement to address the causes of ozone depletion. Chlorine atoms react with ozone, starting a chemical cycle that destroys the good ozone in that area. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. Ozone layer depletion the emission of ods account for roughly 90% of total depletion of ozone layer in stratosphere. First if it was cfcs the one location on earth that would have the absolutely lowest l. Causes of ozone layer depletion and its effects on human. One of the main reasons for the widespread concern about. The term ozone depletion can refer to a number of distinct, but related phenomena. Pdf causes of ozone layer depletion and its effects on.
Sep 20, 2016 the breaking up action releases chlorine atoms. A combination of low temperatures, elevated chlorine, and bromine concentrations in the upper stratosphere are responsible for the destruction of ozone. The emission of ozone depleting substances has been damaging the ozone layer. This proves ozone depletion is a big issue that needs attention. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. Found in industrial solvents, drycleaning agents and hospital sterilants. 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. It is found that the ozone layer gets affected by some natural causes that are sunspots and stratospheric winds.
The montreal protocol is an international agreement to address the causes of ozone depletion. Ozone is unstable and decomposes to molecular oxygen. Ozone depletion consists of two related events observed since the late 1970s. What are the causes and effects of ozone depletion.
Causes and effects of ozone layer depletion that are. Hence, we should be aware and actions must be taken to ensure that ozone layer is not destroyed. Causes and effects of stratospheric ozone reduction. Ozone layer depletion cause, effects, and solutions. A free powerpoint ppt presentation displayed as a flash slide show on id. Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. This study was conducted at university of gujrat during 20142015 as a term paper for master of philosophy. One chlorine atom can break apart more than 100,000 ozone molecules. Scribd is the worlds largest social reading and publishing site. Ozone depletion is largely a result of manmade substances. Secondly, the warming of generation of reactive free radicals as it causes troposphere global warming the effect of catalytic destruction of ozone layer. The latest satellite measurement indicates an ozone loss at the rate of 8% just above the south pole, at the centre of the ozone hole, 5% of the protective gas is depleting each day. 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 refers to a region of earths stratosphere that absorbs most of the suns uv radiation.
One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in. Cfcs account for almost 80% of the total depletion of ozone. Ozone depletion is primarily caused by human activities. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Ozone depletion ozone depletion chlorofluorocarbon. The ozone layer depletion is a major concern and is associated with a number of factors. These gases are carried to the stratosphere layer of atmosphere where. Ozone depletion is allowing the uv radiation to earth surface. Ozone is a gas that is present in the ozone layer in the stratosphere of the earth. What is an ozone hole and causes and effects of ozone. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. A reduced ozone layer causes a number of serious health risks for humans. Pdf causes of ozone layer depletion and its effects on human. Free chlorine atoms then break apart molecules of ozone, creating a hole in the ozone layer.
Thinning of the stratospheric ozone layer has been caused largely by longlived chlorine and bromine. Ozone layer depletion essay sample new york essays. Pdf on jan 1, 2001, md safiuddin and others published global ozone. Pdf this study was conducted at university of gujrat during 20142015 as a term paper for master of philosophy. The thinning is most pronounced in the polar regions, especially over antarctica.
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. This quick video discusses the role of the ozone layer and how cfcs can cause ozone depletion. The human activity is the main cause of the hole in the ozone layer and is produced by some chemical substances. Ozone depletion and climate change environment canada. Chlorofluorocarbons or the cfc are the main cause of ozone layer depletion. Why the hole in the atmospheric ozone layer above us. The ozone layer helps to protect life from harmful ultraviolet radiation. The latest ozone layer depletion news is included at the foot of the page. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. Ppt ozone layer depletion powerpoint presentation free to. The problems and causes associated with ozone depletion arise from human activities. Thus, ozone layer depletion has become a major concern among the environmentalists.
Hii,the ozone in the ozone layer is being broken down by chlorine atoms from chlorofluorocarbon cfc molecules and bromine atoms from halons. Ozone layer depletion definition, causes, solutions toppr. While several substances were addressed, chcs and hcfcs were the main ones that the international. A dynamic equilibrium is maintained between the formation and decomposition of ozone. Powerpoint is the worlds most popular presentation software which can let you create professional depletion of ozone layer powerpoint presentation easily and in no time. Ozone depletion facts and information national geographic. Solution on ozone layer depletion september 16 was voted the world ozone day in the year 1994 by the united nations general assembly. Mar 12, 2019 ozone layer depletion is the destruction of ozone gas of upper atmospheric layer stratosphere, caused by substances formed from breakdown of. These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. 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 ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson.