A close look at the evolution at the life on earth reveals that initially the. Evidence of ozone depletion in the stratosphere began to appear in the 1980s. This leads to their breakdown and releasing of free chlorine atoms which reacts with the ozone gas, thus leading to the depletion of the ozone layer. Ozone in the ozone layer is formed by the action of solar ultraviolet light on oxygen. Protecting the ozone layer and reducing global warming undp. Ozone layer depletion cause, effects, and solutions. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone. 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. Ozone depletion and climate change environment canada. 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. The ozone depletion phenomenon the national academies press. Causes of ozone layer depletion and its effects on human. With less ozone in the atmosphere, more ultraviolet radiation strikes earth, causing more skin cancer, eye damage, and possible harm to crops. You can find maps of the ozone layer and compare different regions of the globe for ozone coverage.
Ozone depletion ozone depletion chlorofluorocarbon. If interested, you can purchase this powerpoint from my online store. This quick video discusses the role of the ozone layer and how cfcs can cause ozone depletion. The series is divided into three sections the science of ozone depletion 10, the impacts of ozone depletion 6, and managing ozone depletion 4. Ozone layer depletion ozone layer depletion the effect on the world the effect of ozone layer depletion often seems as if it is a far away problem, given that the actual holes in this protective blanket over the earths atmosphere are concentrated around the poles and far from most human settlements. Our experts wont do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions. Free chlorine atoms and chlorinecontaining gases, such as chlorine monoxide clo, could then break ozone molecules apart by stripping away. The increase of ultraviolet light due to depletion of the ozone layer will not only have. British science teams in antarctica observe 10% decline in o 3 layer us scientists relying on toms total ozone mapping spectrometer measurements from space claim to observe nothing. Compare ozone formation in the free troposphere, in photochemical smog and in 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.
Designation of amount of such depletion as an ozone hole is made when the detected amount of depletion exceeds fifty percent. Ozone can be beneficial or harmful depending on its location in the earths atmosphere. 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 ozone layer helps to protect life from harmful ultraviolet radiation. A seasonal decrease, or hole, in the ozone layer above antarctica, first discovered in 1982 and reported in 1985, was the first confirmation of a thinning of the layer.
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. Pdf causes of ozone layer depletion and its effects on. Ozone is a gas that is present in the ozone layer in the stratosphere of the earth. 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. There, it will absorb almost all ultraviolet light which is harmful to many organisms. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. Jun 19, 2017 the best sleeping position for back pain, neck pain, and sciatica tips from a physical therapist duration. 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 ozone depleting substances ods. Ozone is important because it absorbs specific wavelengths of ultraviolet radiation that are particularly harmful to living organisms. Ppt a seminar on the depletion of the ozone layer, presented by. The ozone layer is important for blocking most of the harmful radiation that comes from the sun.
The thinning is most pronounced in the polar regions, especially over antarctica. 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. Protecting the ozone layer department of the environment. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Ozone depletion simple english wikipedia, the free encyclopedia. This is the cause for the nearly 80% of the ozone depletion. It protects us from harmful uv rays that can have serious effects on animals, biodiversity and peoples health, including skin cancer and eye cataract. Download a pdf of the ozone depletion phenomenon by the national research council for free. Ozone depletion simple english wikipedia, the free. Ozone is a pale blue gaseous form of oxygen, in chemical form it is also known as o3. A number of consequences can result from increased levels of uvultraviolet radiation striking the earth, including. There are also springtime polar tropospheric ozone depletion. The ozone layer prevents most of this harmful radiation from reaching the ground.
Our powerpoint presentation about ozone depletion, its effects and its causes. Ozone layer depletion causes, effects and solutions 7. Ozone layer protection seminars in developing countries. The ozone layer prevents most ultraviolet uv and other highenergy radiation from penetrating to the earths surface but does. Nasa provides daily images, data, and information from satellite instruments that monitor the ozone layer and the ozone hole ozone holea thinning break in the stratospheric ozone layer. If you would like to discuss your ideas or need help troubleshooting, use the ask an expert forum. Ozone o3 is present in 1 ppm in the upper stratosphere, and it absorbs virtually all of the uv radiation from the sun. 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. A seminar on the depletion of the ozone layer, presented by ozoagu peter cj. 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 ozone layer filters out most of the suns harmful uv radiation and is therefore crucial to life on earth. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride, and methyl chloroform. Ozone layer research and technical resources us epa. Ozone is formed by photochemical reaction, followed by three body reaction. Ozone gas is perceptibly blue in colour and has a characteristic pungent smell.
Ozone depletion definition of ozone depletion by the. Following is the list of some of the main ozone depleting substances and the sources from where they are released. National seminar on plant science and human welfare. 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. If the ozone is located in the troposphere which extends from the surface of the earth up to approximately 10 miles it is a harmful pollutant and a major component in. A free powerpoint ppt presentation displayed as a flash slide show on id.
The natural distribution of ozone around the earth is. 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. Project report on ozone depletion environmental pollution. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. Additional copies may be obtained, free of charge, from. It covers the entire planet and protects life on earth by absorbing harmful ultravioletb uvb radiation from the sun. Ozone exists within both the tropospheric and stratospheric zones of the earths atmosphere in the troposphere, ground level ozone is a major air pollutant and primary constituent of photochemical smog in the stratosphere, the ozone layer is an essential protector of life on earth as it absorbs harmful uv radiation before it reaches the earth. Pdf ozone depletiona warning of global warming researchgate. Ozone layer depletion penn state college of earth and. Designation of amount of such depletion as an ozone hole is made when the.
Ozone depletion definition of ozone depletion by the free. Ozone depletion synonyms, ozone depletion pronunciation, ozone depletion translation, english dictionary definition of ozone depletion. It shields the entire earth frommuch of the harmful uv radiationthat comes from the sun 3. Common uses for ods and other halocarbons include propellants, refrigerant gases, sterilants, solvents and fireextinguishing agents. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Presentation on ozone depletion linkedin slideshare. Ozone depletion definition ozone depletion is the term commonly used to describe the thinning of the ozone layer in the stratosphere.
Ozone absorbs a band of ultraviolet radiation called uvb. Together, they describe what ozone, the ozone layer, ozone depletion and the ozone hole are, how ozone depletion occurs, mankinds influence, its impacts, and. Ppt ozone layer depletion powerpoint presentation free. The 2014 wmounep scientific assessment of ozone depletion overview 14 january 2014 i. The best sleeping position for back pain, neck pain, and sciatica tips from a physical therapist duration. List of books and articles about ozone layer online. Is there a difference in ozone coverage between different hemispheres.
Unlike oxygen o2, ozone has a strong scent and is blue in color. The hole in the ozone layer above antarctica has more farreaching consequences than previously assumed. The severe depletion of the antarctic ozone layer known as the ozone hole occurs because of the special meteorological and chemical conditions that exist there when the very low winter temperatures in the antarctic stratosphere cause polar stratospheric clouds pscs to form which are isolated from stratospheric air in the polar vortex. This is apparently found in the lowest region of the stratosphere. Jul 02, 2015 this quick video discusses the role of the ozone layer and how cfcs can cause ozone depletion. Protection of the ozone layer climate action european commission. Ozone depletion facts and information national geographic. The third body m absorbs the excess energy liberated by the above reaction and there by stabilise the o 3 ozone molecule. 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. Stratospheric ozone depletion is a concern because the ozone layer in the stratosphere keeps 9599% of the suns ultraviolet radiation from striking the earth. There, sunlight could free the chlorine or bromine atoms to form chlorine monoxide or other chemicals, which would deplete upperatmospheric ozone. Title vi for stratospheric ozone protection, signed into law. The term ozone depletion can refer to a number of distinct, but related phenomena.
As concern grew over depletion of ozone in the stratosphere scientists examined the. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. Ozone depletion free download as powerpoint presentation. Ozone depletion ozone depletion chlorofluorocarbon free. Experts blame ozonelayer depletion on manmade chemicals containing chlorine and bromine that are emitted from a. It contains some videos and gif at thte end from an external source.
The latter phenomenon is referred to as the ozone hole. The concept of ozone depletion potential odp is widely used wuebbles et al. Ozone depletion is among one of the most significant environmental challenges of the past century and. Why the hole in the atmospheric ozone layer above us. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. Ozone depleting definition of ozone depleting by medical. Let us see a few possible effects of the ozone layer depletion on the earths environment and also on the plants and animals. 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. Ppt ozone layer depletion powerpoint presentation free to. Use the information in the summary tab as a starting place.
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. The ozone layer protects us from excessive levels of harmful ultraviolet uv radiation. Ozone depletion occurs when the natural balance between the production and destruction of ozone in the stratosphere is tipped in favour of destruction. 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. A large area of the ozone layer over antarctica that annually becomes depleted of ozone by the action of chlorofluorocarbons and other pollutants. Ozone depletion potential an overview sciencedirect topics. Ozone layer is a thin, fragileshield that contains relatively highconcentrations of ozone. The left side, compound gauge blue and the right side, highpressure gauge red, are attached to the manifold to measure system pressures.
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