Why the hole in the atmospheric ozone layer above us. The ozone layer and its depletion linkedin slideshare. The thinning of the ozone layer has increased the risk that australians already face from overexposure to uv radiation from an outdoor lifestyle. The accumulation in the earths atmosphere of these gases is mainly the result of the gargantuan consumption of the developed countries, particularly the united states. A free powerpoint ppt presentation displayed as a flash slide show on id. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. As worldwide controls reduce the release of cfcs and other ozoneeating substances, nature will repair the ozone layer. Causes of ozone layer depletion and its effects on human. Stratospheric ozone is the ozone that is formed in the atmosphere with the rays from the sun as source of energy. Ozone layer depletion cause, effects, and solutions.
Declines since 1996 in total column and stratospheric abundances of inorganic chlorine compounds are reasonably consistent with the observed trends in longlived source gases over this period. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. Indias integrated approach to protect the ozone layer. 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. The ozone depletion phenomenon the ozone depletion. Like an infection that grows more and more virulent, the continentsize hole in earths ozone layer keeps ge. The wri report is entirely designed to blame developing countries for sharing the responsibility for global warming. Inexpensive light extremely stable, inert traditional refrigerants ammonia, sulfur dioxide, methyl chloride highly volatile caustic and toxic remove heat through vaporization of liquefied gas only adequate as refrigerants expensive heavy transport, storage. Ozone absorbs a band of ultraviolet radiation called uvb. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Ozone layer research and technical resources us epa. B dobson and other scientists in measuring concentrations of chloride and ozone in the atmosphere g.
The so 2f 2 global background mixing ratio increased during recent decades and had reached about 1. List of books and articles about ozone layer online. The state of scientific understanding regarding the ozonedepletion issue has advanced in recent years as a result of the concerted efforts of hundreds of scientists worldwide. Jun 19, 2017 the best sleeping position for back pain, neck pain, and sciatica tips from a physical therapist duration. Ppt ozone layer depletion powerpoint presentation free to. Science of ozone layer depletion 12th th march, 2007 jaipur cfc, halon, ctc, methyl chloroform, methyl bromide and hcfc. Award of certificates to refrigeration and airconditioning technicians.
Prevent global warming ministry of economy, trade and industry. Progress report 2003 united nations environment programme, environmental e. Ozone layer depletion is the thinning of ozone layer that protects the earth from the harmful uv radiations. The layer shields the entire earthfrom much of the harmful ultravioletradiation that comes from the sun. If you continue browsing the site, you agree to the use of cookies on this website. Vivert1448 priyanka n jeevan 1446 1453 rekha 1445 shabnam 1447. Ozone center organized open lecture devoted to world ozone day. 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. It is present in traces less than 1 ppm in the atmosphere. Ozone depletion also explains much of the observed reduction in stratospheric and upper tropospheric temperatures. The concept of ozone depletion potential odp is widely used wuebbles et al. There is a corresponding hole over the arctic that similarly appears in the spring, although in some years warmer winters there do not result in a major depletion of the ozone layer. 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. When there was no ozone layer, life could only exist in the sea protect the ozone layer.
Solstice foam blowing agents unido russia september 2015. Access information on research and technical resources related to ozone layer science. Following is the list of some of the main ozone depleting substances and the sources from where they are released. 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 fact sheet series is aimed at students involved in key stage 4 of the national. When there was no ozone layer, life could only exist in. When we speak of ozone depletion and ozone holes it means that the ozone up in the stratosphere produced by the sun in some way has disappeared. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. Designation of amount of such depletion as an ozone hole is made when the detected amount of depletion exceeds fifty percent.
Pdf causes of ozone layer depletion and its effects on. Multiyear data base of 4d ozone fields, consistent with the available satellite observations, consistent with the dynamical state of the atmosphere science questions. Protocol, ozone depletion and it health and environmental effects, of the work accomplished by eritrea on the implementation of the montreal protocol and future plans. Ozone depletion has largely been controlled through operative pediatric urology pdf the montreal. The ozone layer is found in the upper stratosphere and its primary function is to filter ultraviolet shortwave radiation that. Odp is a relative value of the ozone destructive potential of a chemical substance by unit weight emitted into atmosphere, with the unit weight of cfc11 as 1. Protecting the ozone layer department of the environment. The natural distribution of ozone around the earth is. Within the stratosphere, the ozone layer is the portion that contains the highest. 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. 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. The fact is that ozone is also used for disinfection of air, water and for a lot of other industrial processes such as bleaching of paper pulp. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc.
At the end of 20, 258 projects have been committed for an. Ozone is a very reactive molecule that has a very strong oxidizing ability. From protecting the ozone layer to preventing global warming. The chlorofluorocarbon and the halons are potent ozone depletors. Presentation on ozone depletion slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Measured column abundances of hydrogen fluoride increased during 20052008 at a smaller rate than in earlier years. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is tipped in favour of destruction.
The subtropical ground ozone concentration in northern hemisphere is twice the corresponding region in southern hemisphere 5. Ozone depletion potential an overview sciencedirect topics. The ozone layer prevents most ultraviolet uv and other highenergy radiation from penetrating to the earths surface. Dong wang, seth olsen, and donald wuebbles department of atmospheric sciences university of illinois, urbana, il 2. Project ozone layer depletion pdf the stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. Hole in the ozonewas created by chemicals layer has been caused bylike cfc.
Its consequences, the causal debate, and international cooperation number 6 february 8, 1988 since the announcement of a thinning of the ozone layer over the antarctic by uk scientists in 1985, world attention has been focusing on the causes of this phenomenon. The biggest cause for this is the use of substances like freon. Location of stratosphere thermosphere exosphere troposphere mesosphere stratosphere 10 km 40 km 50 km 300 km 400 km. Report on activities devoted to the international day of. This year 16 september 2015 was celebrated nationally for the 11th time. 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. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in. Henk eskes, royal netherlands meteorological institute. Jan 30, 2012 the ozone layerthe ozone layer is a deep layer in thestratosphere, encircling the earth,that has large amounts of ozone in it. The latter phenomenon is referred to as the ozone hole.
As a result, there has been a general thinning of the ozone layer over most of the globe, including between five to nine per cent depletion over australia since the 1960s. The concern is because of the fact that the ozone layer plays a protective role, screening the earth from harmful ultraviolet radiations. Pdf there are many situations where human activities have significant effects on the environment. Since india already receives high doses of ultraviolet uvb radiation, and is at the threshold go to speak, effects of ozone layer depletion.
They gave information on the montreal protocol, kigali amendment, impact of ods and phasing out, depletion of the ozone layer, ozone holes, and dangerous effect of the uv radiation and results of ods phasing out. By year 2065 stratospheric ozone should return to the amount present in 1980. Title vi for stratospheric ozone protection, signed into law. The state of scientific understanding regarding the ozone depletion issue has advanced in recent years as a result of the concerted efforts of hundreds of scientists worldwide. Cfcs and other substances are decomposed by the influence of strong ultraviolet light from the sun. Case study depletion of ozone in the atmosphere the work of g. Pilasing these cllemicais out is imperative not only to preserve the ozone layer, but to stabilize tile earth s. The role of ozone depletion in australias changing climate three speakers prominent in the field of ozone and climate science will be speaking on the relationship between ozone depletion and climate change. Ozone depletion describes two distinct but related phenomena observed since the late 1970s. A global thinning of the ozone layer results as ozone rich air from the remaining ozone layer flows into the ozone poor areas.
Ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. Presentation on ozone depletion linkedin slideshare. This idea connects two issues global warming and depletion of ozone in the upper atmosphere inappropriately, which diverts attention from the main cause of global warming. For nearly a billion years, ozonemolecules in the atmosphere haveprotected life on earth from theeffects of. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection.
Ecmwf seminar, september 2003 ozone assimilation in numerical weather prediction. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. Near the ground, ozone forming as a result of chemical reactions involving traffic pollution and sunlight may cause a number of respiratory problems, particularly for young children. It is found largely in the stratosphere that extends from about 6 km at the poles and 17 km at the equator to about 50 km above the earths surface. No impact on ozone layer depletion and is commonly referred to as zero, reference. Indias integrated approach to protect the ozone layer introduction one of the most important environmental concerns the world faces today is of depletion of the ozone layer in the stratosphere. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. On 15th of september 2017, seminar under the motto caring for all life under the sun devoted to the international day of the ozone layer protection were held at bishkek mountain multidisciplinary college. To celebrate this day, nou of kyrgyz republic organized activities such as open lectures, environmental action and seminars in bishkek, osh and karakol cities. Unlike oxygen o2, ozone has a strong scent and is blue in color.
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 and climate change, or ozone hole and global warming in. This page provides links to research efforts led by organizations such as the national oceanic and atmospheric administration, the united nations environment program, an. Nearly 500 organizations, teams, and individuals from 40 countries have received stratospheric ozone protection awards for their exceptional leadership, personal dedication, and technical achievements. Henk eskes, ecmwf seminar, september 2003 ozone assimilation in numerical weather prediction benefits for atmospheric chemistry science community. Another misconception is that ozone layer depletion causes global warming by letting in extra solar radiation. 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. R e p o r t on celebration of the international ozone day 2017 bishkek 2017. Scientists predict that ozone depletion should peak around year 2010. The ozone layer protects us from excessive levels of harmful ultraviolet uv radiation. Cfcs nonflammable nontoxic trap heat good insulators.
Eritrea has been commemorating the ozone layer 16, september 2015 for the preservation of the ozone layer ever since it became party to both the vienna convention and the montreal protocol in 2005. 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. Misconceptions about the ozone layer depletion common mistake factglobal warming is caused the ozone layer protects theby the ozone hole which earth from the suns harmful uv rays. Analyses of tcfps potential impact on atmospheric ozone.
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