Global warming is caused by ozone depletion, not greenhouse gases. Ozone is formed by photochemical reaction, followed by three body reaction. Cfcs get banned in 1974 scientists sherry rowland and mario molina discovered the link between the depletion of the ozone layer and cfcs. Ozone science crossword puzzle ozone layer protection us epa. Due to depletion of ozone uv rays are penetrating in troposphere and leading. Timeline of stratospheric ozone depletion and observations. The ozone depletion phenomenon the ozone depletion. Ozone in the stratospherea layer of the atmosphere between 15 and 50 kilometers 10 and 31. The thinning or reduction of ozone depletion is most prominent in the polar regions, especially over antarctica. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. The ozone hole and global warming union of concerned. How does ozone depletion affect uv levels and life on earth.
The third body m absorbs the excess energy liberated by the above reaction and there by stabilise the o 3 ozone molecule. Ozone holes are first discovered in antarctica in 1970. The natural distribution of ozone around the earth is. Oct 18, 2018 ozone depletion ozone depletion information from the united states environmental protection agency. Money and time are being spent on ozone repair, but the problem still exists. Electromagnetic energy coming from the sun is absorbed by the earth, which. Ozone layer depletion causes, effects and solutions 7. Test your knowledge of ozone layer science and ozone depletion in this crossword puzzle. Pdf plancks law, developed empirically to describe observed thermal radiation, shows that thermal energy in radiation and therefore in matter. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. As a result of its chemical composition, ozone is regarded as a special type of oxygen as it contains three oxygen molecules o3 as opposed to the usual two oxygen molecules o2.
Increased depletion has recently started occurring over the arctic as well. Unfortunately, cfcs can eventually find their way into the earths atmosphere and the ozone layer. Dear students, the team of jagran josh is presenting you a set of 10 questions based on ozone layer depletion. This is apparently found in the lowest region of the stratosphere. Ozone absorbs a band of ultraviolet radiation called uvb. Ozone is a gas made up of molecules that are formed by three oxygen atoms. Predictions of significant increases in the incidence of skin cancer resulting from continued use of cfcs spurred international action.
The ehso web site provides the latest information, explanations, resources and links free about ozone depletion and many more environmental topics that affect the health of you and your family. 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. Our team made these questions on a particular topic. The depletion of the ozone describes two closely related but distinct phenomena which have been repeatedly observed since the latter 1970s. Ozone depletion consists of two related events observed since the late 1970s. In 1978, the use of cfc propellants in spray cans was banned in the u. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth.
Ozone layer is also naturally broken down but there is a balance between its formation and natu. The antarctic hole now measures about 9 million square miles, nearly the. Learn what cfcs are, how they have contributed to the ozone hole, and how the 1989 montreal. Ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. 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. Humans have introduced gases and chemicals into the atmosphere that have rapidly depleted the ozone layer in the last century. Thus, ozone layer depletion has become a major concern among the environmentalists. Symptoms of ozone exposure when people breathe ozone air pollution, the lining of their lungs can become irritated and inflamed. In the 1980s, scientists found evidence that the ozone layer was being depleted. 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. Ozone depletion occurs when the natural balance between the production and destruction of ozone in the stratosphere is tipped in favour of destruction. The process begins with the emission, at earths surface, of source gases containing the halogens chlorine and bromine see q7. Pdf causes of ozone layer depletion and its effects on. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth.
This depletion makes humans more vulnerable to the uvb rays which are known to cause skin cancer as well as other genetic deformities. Ozone is a form of naturally occurring gas and 90% of our planets ozone is in the stratosphere. The thinning is most pronounced in the polar regions, especially over antarctica. 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. Humans research confirms that high levels of uv rays cause nonmelanoma skin cancer. The ozone layer is mainly found in the lower portion of the stratosphere. There had been a lot of research on this topic over these years to find out all the possible causes that lead to this problem and the effects of ozone depletion. Depletion of the ozone layer results in increased uv radiation reaching the earths. The main causes responsible for the depletion of the ozone layer are listed below. This is the cause for the nearly 80% of the ozone depletion. The sun renews the ozone and natural chemicals in our atmosphere destroy it.
Causes, effects and solutions of ozone layer depletion. Presentation on ozone depletion linkedin slideshare. Almost always the ozone has only been correlated with the hole in the ozone layer and the damages it has caused to the environment. A close look at the evolution at the life on earth reveals that initially the. Once they get there they destroy ozone molecules and cause the ozone layer to become depleted or thinner. The richness of the ozone layer that makes the hole so significant and the science behind the hole is far less popular. B dobson and other scientists in measuring concentrations of chloride and ozone in the atmosphere g. Like an infection that grows more and more virulent, the continentsize hole in earths ozone layer keeps getting bigger and bigger each year since the late 1970s, much of the protective layer of stratospheric ozone above antarctica has disappeared during september, creating what is popularly known as the ozone hole. Safeguarding earths protective ozone layer became a.
However, a number of manmade chemicals that contain fluorine, bromine and chlorine groups, called ozone depleting. The stratosphere is home to the ozone layer that protects life on earth from intense ultraviolet radiation. The troposphere is the layer where most weather activity. In 1987, 56 countries agreed under what became known as the montreal protocol to cut cfc production. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. There are also springtime polar tropospheric ozone depletion.
It sets binding obligations for countries to phase out production of all the major ozone depleting substances. Feb 12, 2018 far above earths surface, the ozone layer helps to protect life from harmful ultraviolet radiation. Ozone depletion atmospheric ozone layer depletion is a serious problem currently facing the world. Ozone depletion potential an overview sciencedirect topics. 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. Ozone, o 3, triatomic allotrope of oxygen a form of oxygen in which the molecule contains three atoms instead of two as in the common form that accounts for the distinctive odour of the air after a thunderstorm or around electrical equipment. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a result of increasing pollution. The ozone layer depletion is a major concern and is associated with a number of factors. The main effect of ozone depletion is an increase in uvb rays reaching the earths surface. Microscopic animals harmed by excess ultraviolet uv 6. The latter phenomenon is referred to as the ozone hole. Few years ago ozone holes are also discovered in arctic region.
Pdf on jan 1, 2001, md safiuddin published global ozone depletion. Ozone depletion, gradual thinning of earths ozone layer caused by the release of chemical compounds containing gaseous chlorine or bromine from industry. Stratospheric ozone depletion, ultraviolet radiation and. Ozone depletion began increasing in the early 1970s caused by increasing. The site contains sections on ozone science, the regulatory approach to protecting the ozone layer, and educational information on sun safety. One atom of this can destroy over 100,000 ozone molecules. Ozone science crossword puzzle ozone layer protection.
Destruction of the upper atmospheric layer of ozone gas, caused by substances formed from breakdown of ozone depleting substances. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. It became evident that a stronger world wide response was needed. 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 concept of ozone depletion potential odp is widely used wuebbles et al. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. This typically results from higher uv levels reaching us on earth. The ozone layer forms a most important part of the earths stratosphere as it can absorb most of the uv radiation and prevent it from reaching the surface of the earth. Mar 28, 2020 ozone depletion biology projects, biology science fair project ideas, biology topics for cbse school,icse biology experiments for kids and also for middle school, elementary school for class 5th grade,6th,7th,8th,9th 10th,11th, 12th grade and high school, msc and college students. Chlorofluorocarbons or the cfc are the main cause of ozone layer depletion. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation.
Ozone is formed when the sunlight hits oxygen molecules o 2 and breaks them up into individual atoms. Ozone layer depletion cause, effects, and solutions. Ozone depletion biology science fair project ideas. Generally, we find thinning or depletion of the ozone layer to the extent of ozone hole creation over the southern pole i. Case study depletion of ozone in the atmosphere the work of g. Ozone depletion is primarily caused by human activities. Project report on ozone depletion environmental pollution. Publications about the ozone depletion theory of global warming. 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. Scientific assessment of ozone depletion montreal protocol. Causes of ozone layer depletion and its effects on human. The whole world is vulnerable to its after effects. From the 1970s the depletion of the ozone layer started to capture the attention of the scientists, environmentalists, and the world community at large. 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 there is widespread scientific interest in better regulation of climate change, ozone depletion and air pollution, as.
Ozone depletion facts and information national geographic. The increase in the levels of uv rays lead to high rate of skin cancer and eye related problems. Pdf there are many situations where human activities have significant effects on the environment. Oct 27, 2017 the effects of ozone depletion on plants and animals massive amounts of uvb radiation that penetrate our atmosphere do not only affect humans, but also animals and plants. Causes of ozone depletion our environment cbse grade. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. Data shows that stratospheric concentrations of ozone. Solomon and albritton, 1992 as a measure of the effectiveness of a given compound in removing ozone, relative to a standard compound, which is taken to be cfc11. These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. May 19, 2020 ozone depletion is largely a result of manmade substances.
Since 2000 rate of ozone depletion is increasing 0. The chlorofluorocarbon and the halons are potent ozone depletors. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. In this entry we present the data on ozone layer depletion, signs of recovery, emissions of ozonedepleting substances, international agreement and. Les diablerets, switzerland by jeanpierre pommereau, june 2010. In the 1980s, the antarctic ozone hole appeared and an international science assessment more strongly linked the release of cfcs and ozone depletion. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. The halogen source gases, often referred to as ozonedepleting substances odss, include manufactured chemi. The ozone layer protects humans, animals, and plants from harmful ultraviolet rays. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. Ozone depletion definition ozone depletion is the term commonly used to describe the thinning of the ozone layer in the stratosphere. The odour of ozone around electrical machines was reported as early as 1785. Polar stratospheric clouds and ozone depletion pdf. Update on ozonedepleting substances odss and other gases of.
Lets have a look at some of the solutions to ozone layer depletion. Ozone air pollution and health studies have indicated that exposure to groundlevel ozone air pollution, even at very low levels, can cause a number of respiratory health effects particularly over time. In fact whole world is vulnerable to its after affects. Within the stratosphere, the ozone layer is the portion that contains the highest proportion 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. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epaapproved alternatives to ozone depleting substances, and sun safety. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. The depletion of ozone layer has trickle down effects in the form of global warming, which in turn leads to melting of polar ice, which will lead to rising sea levels and climatic changes around the world. Ozone layer depletion is not something that affects any specific country or region.
Additionally, it plays a major role in malignant melanoma development. Depletion to ozone layer depletion does not affect a region or a country. 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. Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. The ozone layer absorbs much of the incoming solar ultraviolet radiation uvr and thus offers substan tial protection from this radiation to all organisms living at. Ozone depletion describes two distinct but related phenomena observed since the late 1970s. This allotropic form of oxygen is formed by passing dry oxygen through a salient electric current.
By doing so a part of the oxygen molecules undergo dissociation and then atomic oxygen gets associated with the oxygen molecule to give 5%10% of the allotropic form of oxygen. The ozone layer is a deep blanket in the stratosphere made up of comparatively high concentration of the ozone. Ozone depletion, gradual thinning of earths ozone layer caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. What are the causes and effects of ozone depletion.
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