Ozone layer is a thin, fragileshield that contains relatively highconcentrations of ozone. Ozone layer depletion, its causes and its effects ozone. Experts blame ozonelayer depletion on manmade chem. While several substances were addressed, chcs and hcfcs were the main ones that the international. The depletion region is also called as depletion zone, depletion layer, space charge region, or space charge layer.
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. Jan 20, 2010 the montreal protocol is an international agreement to address the causes of ozone depletion. All books are in clear copy here, and all files are secure so dont worry about it. Students explore the causes and effects of the earths ozone holes through. Ozone depletion free download as powerpoint presentation. The chlorofluorocarbon and the halons are potent ozone. Mar 21, 2020 ozone depletion, gradual thinning of earths 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 depletion, greenhouse gases, and climate change the. In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an electric field. Polar stratospheric clouds and ozone depletion pdf. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride, and methyl chloroform. A lot of supermarkets and health stores sell cleaning products that are toxic free and made out of natural ingredients.
Another most feared aspect of pollution is depletion of ozone layer of the stratosphere. The average depletion exceeds the natural variability of the ozone layer. Thousands of new, highquality pictures added every day. Within the stratosphere, the ozone layer is the portion that contains the highest. Global ozone research and monitoring project wmo library. 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. Causes of ozone layer depletion and its effects on human.
This is apparently found in the lowest region of the stratosphere. Ozone layer is a deep layer in earths atmosphere that contains ozone which is a naturally occurring, highly reactive molecule that contains three oxygen atoms. However, the fact that there also exists another layer strong enough to stop the former one is comforting. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. Control of ozone layer depleting substances proclamation no. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. Presentations ppt, key, pdf logging in or signing up. Normal ozone ozone layer depletion and its effects. It protects us from harmful uv rays that can have serious effects on animals, biodiversity and peoples health, including skin cancer and eye cataract. Ppt ozone layer depletion powerpoint presentation free. The concentration of ozone in the atmosphere depends on a dynamic balance between how fast it is created and how fast it is destroyed. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed.
Ozone layer depletion ozone layer depletion is the gradual thinning of the earths ozone layer in the upper atmosphere caused due tho release of chemical compounds containing gaseous bromine or chlorine from industries or other human activities. Avoid using pesticides and prevent ozone depletion. This content is exclusively provided by fao faolex ecolex controlled substances are listed in the annexes to the protocol. Let us have a detailed look at the various causes and effects of ozone layer depletion. There, sunlight could free the chlorine or bromine atoms to form chlorine monoxide or other chemicals, which would deplete upperatmospheric ozone. Policy responses to ozone depletion mario molina and sherwood rowland showed in 1974 that cfc gases destroy ozone coordinating committee on ozone layer ccol established by unep in the 1970s vienna convention for the protection of the ozone layer held in 1985 montreal protocol to ban substances that deplete the ozone layer held in 1987. The montreal protocol on substances that deplete the ozone layer was adopted in 1987 to protect global. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated. Ozone layer protection european commission european union.
At present, the global rocket launches do not contribute hugely to ozone layer depletion. This ozone layer sustains life on the earth by absorbing a great deal of uv ultra violet light radiating out of sun. Find ozone depletion stock images in hd and millions of other royaltyfree stock photos, illustrations and vectors in the shutterstock collection. Unlike oxygen o2, ozone has a strong scent and is blue in color. When this breakdown of the ozone layer occurs, the earth stands more vulnerable as it.
Read online causes of ozone layer depletion and its effects on human. List of books and articles about ozone layer online. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. It shields the entire earth frommuch of the harmful uv radiationthat comes from the sun 3. This site is like a library, you could find million book here by using search box in the header. Effects and measures to protect ozone layer depletion. Ozone depletion consists of two related events observed since the late 1970s.
Ozone depletion facts and information national geographic. The ozone layer has been depleted gradually since 1980 and now is about an average of 4% lower over the globe. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause. Our powerpoint presentation about ozone depletion, its effects and its causes. The ozone layer lies approximately 1540 kilometers 1025 miles above the earths surface, in the stratosphere. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. Ozone depletion also explains much of the observed reduction in stratospheric and upper tropospheric temperatures. Ppt ozone layer depletion authorstream presentation. Environmental protection agency epa is proud to have been part of a. Addressing ozone layer depletion ozone layer protection.
But many researchers do not agree with these predictions,14 and express their. Nov 30, 2015 ozone layer depletion what is ozone layer. Thinning of the stratospheric ozone layer has been caused largely by longlived chlorine and bromine. The ozone layer helps to protect life from harmful ultraviolet radiation. 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. Ozone depletion and climate change environment canada. How large is the depletion of the global ozone layer. Pdf causes of ozone layer depletion and its effects on. Undps work on ozone layer protection and programme impact.
Why the hole in the atmospheric ozone layer above us. A free powerpoint ppt presentation displayed as a flash slide show on id. 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. It contains some videos and gif at thte end from an external source. Ozone layer depletion penn state college of earth and. The world meteorological or ganization wmo, 1995 predicted that the depletion of the ozone layer peaked around 1998 and the layer would slowly recover by 2045 12. Nearly 500 organizations, teams, and individuals from 40 countries have received stratospheric ozone protection awards for their exceptional leadership, personal dedication, and technical achievements. Technology transfer and capacity building to accelerate. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. Ozone is harmful at ground level but high up the atmosphere ozone layer plays a vital role in the protection of all living beings. Ozone can be destroyed by a number of free radical catalysts. Depletion of this layer by ozone depleting substances ods will lead to higher uvb levels, which in turn will cause increased skin cancers and cataracts and potential damage to some marine organisms, plants, and plastics.
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. Additional copies may be obtained, free of charge, from. The sun propagates ultraviolet radiations which as an adverse effect on living beings. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. The ozone layer is mainly found in the lower portion of the stratosphere. At the end of 20, 258 projects have been committed for an. Prevention of ozone layer depletion is one of the most essential things to attend to at this point of time and prevention of ozone depletion is also something that will. Ozone layer depletion, its causes and its effects free download as powerpoint presentation. Download a pdf of ozone depletion, greenhouse gases, and climate change by the national research council for free. The new halonfree systems have been used successfully in iraq. The montreal protocol is an international agreement to address the causes of ozone depletion. Project report on ozone depletion environmental pollution. 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. This study was conducted at university of gujrat during 20142015 as a term paper for master of philosophy.
It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Experts blame ozonelayer depletion on manmade chem icals containing chlorine and bromine that are emitted from a number of products. The depletion region acts like a wall between ptype and ntype semiconductor and prevents further flow of free electrons and holes. It is very essential as it prevents nearly 99% o f the uv. Ozone layer depletion cause, effects, and solutions biology. The depletion of the ozone layer has thus resulted in the birth of a fear in everybodys minds. Ozone layer depletion is the thinning of ozone layer that protects the earth from the harmful uv radiations.
The ozone loss is very small near the equator and increases with latitude toward the poles. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. Affordable and search from millions of royalty free images, photos and vectors. To the point where a seasonal hole in the ozone layer began to appear above the antarctic.
The ozone layer is a belt of the naturallyoccuring gas ozone that sits. The thinning is most pronounced in the polar regions, especially over antarctica. Ozone depletion ozone depletion chlorofluorocarbon. Ozone layer depletion daily current affair article for upsc, ias. We will also need to limit the use of products that have a large amount of chemical composition.
Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. Timeline of stratospheric ozone depletion and observations. Protecting the ozone layer and reducing global warming undp. 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. The main reasons of this depletion are the release of organohalogen compounds like chlorofluorocarbons and bromofluorocarbons. The main causes responsible for the depletion of the ozone layer are listed below. This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. Ozone layer depletion cause, effects, and solutions. Twenty questions and answers about the ozone layer. Find ozone depletion stock images in hd and millions of other royalty free stock photos, illustrations and vectors in the shutterstock collection.
660 928 879 1264 674 193 1135 685 1008 771 457 642 50 1552 114 1188 275 911 649 278 1439 515 1197 1065 898 206 1112 42 27 1160 1522 1398 1256 836 835 1103 154 1601 1032 752 1161 827 250 302 1392 1256 1431