Generally, we find thinning or depletion of the ozone layer to the extent of ozone hole creation over the southern pole i. The treaty is structured around several groups of halogenated hydrocarbonsthat deplete stratospheric. A protective ozone layer swedish environmental protection. Protection of the ozone layer climate action european commission.
In this brainpop movie, tim explains everything you need to know about ozone, a rare but important gas you hear about all the time. The ozone molecule is unstable and also there is a continuous cycle that goes on leading to the formation of the ozone layer. Raising awareness is the key to ensuring that industry and the public play an active role in meeting the challenges posed by ozone depletion. Ozone layer prevents ultraviolet rays from reaching the earth.
The montreal protocol on substances that deplete the ozone layer 1 preamble the parties to this protocol, being parties to the vienna convention for the protection of the ozone layer, mindful of their obligation under that convention to take appropriate measures to protect human health and the environment against. Progress report 2003 united nations environment programme, environmental e. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. The severe depletion of the ozone layer in any particular area is called ozone hole. M ea suring five steps for raising awareness on ozone depletion. Efforts to protect the ozone layer now involve many different nations and industries. The thinning or reduction of ozone depletion is most prominent in the polar regions, especially over antarctica. The ozone layer resides in the stratospheric layer of the earths atmosphere. Ground ozone concentration is lower in polar and equatorial regions. The world health organization was established in 1948 as a. In lower atmosphere, atmospheric oxygen get dissociated and subsequently combines with. The ozone layer is mainly found in the lower portion of the stratosphere.
The ozone layer is majorly present in the two layers of the atmosphere. In the ozone depletion case, we managed to work with decision makers effectively so that an international agreement called the montreal protocol was achieved that essentially solved the ozone depletion problem. 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. Ozone layer depletion cause, effects, and solutions. The level from which it extends outward varies with latitude. It is a colourless gas that has a very strong smell. Ozone layer depletion causes increased uv radiation levels at. Effects of ozone depletion for humans and the environment. Youll learn what could happen without ozone, and what the governments have done to stop ozone depletion. Ozone gas is perceptibly blue in colour and has a characteristic pungent smell.
Case study on ozone layer ozone depletion chlorofluorocarbon. The subtropical ground ozone concentration in northern hemisphere is twice the corresponding region in southern hemisphere 5. One of whos constitutional functions is to provide objective and reliable information and advice in the field of human health, a responsibility that it fulfils in part through its publications. In determining that the depletion of the ozone layer is bad for the humans, plants, and animals. It is also one of the prime reasons which are leading to global warming. The effects of ozone depletion and volcanic aerosols on climate.
The ozone layer was discovered in 19 by the french physicists. One example of ozone depletion is the annual ozone hole over antarctica that has occurred during the antarctic spring since the early 1980s. Hence, cfcs are transporting agents that are responsible for damaging the ozone layer. Frequently asked questions about the ozone layer ozone. The concentration of ozone in the ozone layer is very less but it is very important for human life on earth. As a result the total amount of ozone remains constant. Case study on ozone layer free download as powerpoint presentation. Depletion to ozone layer depletion does not affect a region or a country. Lets have a look at some of the solutions to ozone layer depletion. The increase in the levels of uv rays lead to high rate of skin cancer and eye related problems.
Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. Ozone layer depletion causes increased uv radiation levels at the earths surface. 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. European environment agency for the status of the currently ongoing ozone hole, you can visit the copernicus web site. Find answers to frequently asked questions about the ozone layer, ozone depletion, and the effects of ozone depletion on health and the environment. The richness of the ozone layer that makes the hole so significant and the science behind the hole is far less popular. Ozone depletion, ozone hole, ultraviolet radiation. In the upper atmosphere, atmospheric gases absorbs the suns radiation, get ionized, and release molecules. First, it describes the threats posed to the ozone layer by the use of ozone depleting substances and analyzes the. Reasons for ozone layer depletion are pollution, burning plastics, waste fumes from factory. Assessment and certificate this course provides an overview of the international legal framework in the fight against ozone depletion. The gefs goal in the ozone layer depletion focal area is to protect human health and the environment by assisting countries to phase out consumption and production and prevent releases of ozone depleting substances according to their commitments to montreal protocol. Since the early 1970s, researchers across the globe have been working to understand the ozone layer, the causes of its depletion, and the effects of ozone layer depletion on humans and the. 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.
Ozone o3 is a stratospheric layer that plays important role in providing support to humans for their survival. 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. Causes of ozone layer depletion and its effects on human. The overall objective of the project is to contribute towards the reduction of direct and indirect releases or emissions of ozone depleting substances hcfcs and greenhouse gases hcfcs and hfcs both through promotion of zero ozone depletion potential odp and low global warming potential gwp alternatives as well as promotion of best practices and better engineered and energy. The antarctic ozone hole, as it came to be known, made depletion of. It is an essential factor for many global, biological and environmental phenomena. The montreal protocol on substances that deplete the ozone layer a protocol to the vienna convention for the protection of the ozone layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances believed to be responsible for ozone depletion. It protects us from harmful uv radiations emitted from. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth.
In our present study, we shall discuss how ozone layer depletion is affecting human health and we shall also discuss some recommendations to minimize ozone depletion and its adverse effects on human health. It protects us from harmful uv rays that can have serious effects on animals, biodiversity and peoples health, including skin cancer and eye cataract. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. Ozone layer depletion article about ozone layer depletion. Gef focal area strategy for ozone layer depletion 1.
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. Ozone layer depletion causes increased uv radiation levels at the earths surface, which is damaging to human health. Ozone layer depletion daily current affair article for upsc. Tthe ozone hole and global he ozone hole and global wwarming 2arming 2 the ozone hole and global warming. Ozone layer depletion daily current affair article for upsc, ias, civil services and state pcs examinations. The modern engineer always keeps longterm sustainability in mind as a design objective. The identification of environmental aspects is an important step towards recognizing their impacts on our planet. Update on ozonedepleting substances odss and other gases of. The oxygen we breathe is made up of 2 oxygen atoms o2, but ozone is made of 3 oxygen atoms o3. The thinning is most pronounced in the polar regions, especially over antarctica. The first report of depletion in o 3 layer came out in the 1980s by an atmospheric scientist in antarctica.
The layer of ozone gas is what which protects us from the harmful ultraviolet radiations of the sun. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. The scientific confirmation of the depletion of the ozone layer prompted the international community to establish a mechanism for. The main culprits seem to be a class of chemical compounds called chlorofluorocarbons, or cfcs. Ozone layer depletion cause, effects, and solutions biology. Climate change and ozone depletion are two global issues that are different but have many connections. Dec 09, 2019 the ozone layer of the atmosphere protects life on earth by filtering out some of the harmful ultraviolet uv radiation from the sun.
Disaster and the environment 1st edition department of. Twenty questions and answers about the ozone layer. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Ozone layer depletion is one of the most serious problems faced by our planet earth.
Pdf causes of ozone layer depletion and its effects on. Geography learning objectives framingham state university. Ozone depletion and climate change environment canada. Project report on ozone depletion environmental pollution.
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. Now i am going to tell you what are the adverse effects caused by the depletion of the ozone layer ozone which accounts for only 3 parts in ten millions of earths atmosphere, plays several crucial roles in the radiation balance of the planet. The natural distribution of ozone around the earth is. Ozone layer lesson plans and lesson ideas brainpop educators.
M ea suring five steps for raising awareness on ozone. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. The montreal protocol on substances that deplete the ozone layer a. This proves helpful in setting and formulating objectives, targets, and other programs that may be directed towards solving environmental problems.
The earth is protected from excessive ultraviolet rays. Ozone layer depletion is the thinning of the ozone layer present in the atmosphere. Ozone layer is also naturally broken down but there is a balance between its formation and natural depletion. The layers which occupy the lower part of the atmosphere removes the unwanted pollutants from the earths surface. This is not really a hole through the ozone layer, but rather a large area of the stratosphere with extremely low amounts of ozone. Students will understand the purposes of and be familiar with the major environmental agencies, laws, and. Experts blame ozonelayer depletion on manmade chem. This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. Causes, effects and solutions of ozone layer depletion.
The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. Ozone depletion consists of two related events observed since the late 1970s. Schonbein in the year 1840 confirmed its existence and jacqueslouis soret rooted the chemical formula of ozone as o3 and proved that ozone is an allotropic form of oxygen. A brief summary of what the ozone is and how its being depleted. Students will be able to differentiate between o2 oxygen and 03 ozone. Ozone layer is an international treaty designed to protect the ozone layerby phasing out the production of numerous substances that are responsible forozone depletion. It was agreed on 16 september 1987, and entered into force on 1 january 1989. Timeline of stratospheric ozone depletion and observations. In humans, it increases the risk of conditions such as skin cancer, suppression of the immune system and eye cataracts. Changes in co 2, n 2 o, and ch 4 will have an increasing influence on the ozone layer as odss decline. Whats ozone is made of, and why is the ozone layer so important. The montreal protocol on substances that deplete the ozone.
Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. The chlorofluorocarbon and the halons are potent ozone. When the ozone layer is depleted either by humanmanufactured cfcs b or by chlorine and bromine emitted by volcanic eruptions c, more ultravioletb sunlight than normal reaches the ocean, warming earth. The ozone layer the buildup of oxygen in the atmosphere led to the natural formation of the ozone layer. By the end of this case study, you should know what the montreal protocol is, be able to explain the causes of ozone depletion, and be able to identify several possible reasons why ozone can be destroyed. Ozone present in the stratosphere forms a protective layer and known as ozone layer, ozonosphere or ozone umbrella its concentration in atmosphere is about 10 ppm.
Draft gef focal area strategy for ozone layer depletion. There are many situations where human activities have. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a result of increasing pollution. Ozone is a colourless gas which is found in the stratosphere of our upper atmosphere. Unless individuals in these groups are aware that the ozone layer is in jeopardy, and of the potential consequences of this, they will not be concerned about it. The only practical approach to stopping the destruction of the ozone layer is to reduce the amount of humancreated pollutants that contribute to its depletion. This has been the most inspiring scientific and didactic resource for the development of the ozonaction education pack that stands for a complementary tool aimed at highlighting the link between ozone layer depletion and increased levels of uv radiation. The production of old cfc refrigerants, such as r12, has now been banned due to its effect on the ozone layer. In 1985, the scientists published an article in nature announcing that stratospheric ozone over antarctica was reduced 40% in september, the end of the austral winter.
Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Legislation on ozone depletion and global warming has forced the refrigeration industry to develop equipment to use alternative and new refrigerants. Faced with the strong possibility that odssgases containing halogens such as cfcscould cause serious ozone depletion, policy makers from around the. Scribd is the worlds largest social reading and publishing site. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders. Students will be able to describe where in the atmosphere the ozone layer is located.
If the ozone layer gets depleted the this safe covering will vanish thus causing damage to life on earth. Instruct the pairs to create educational posters about the depletion of the ozone layer using what theyve learned in. In fact whole world is vulnerable to its after affects. The scientific confirmation of the depletion of the ozone layer prompted the international community to establish a mechanism for cooperation to take action. Ozone layer is very important and compulsory layer in the atmosphere. The ozone layer is a layer 10 meters above earths surface. The montreal protocol on substances that deplete the ozone layer a protocol to the vienna convention for the protection of the ozone layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. Objectives worksheet information answers crosscurricular activities page 79. Ozone layer depletion causes, effects and solutions 7. As controlled ozone depleting substances decline, the evolution of the ozone layer in the second half of the 21st century will largely depend on the atmospheric. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. The overall objective of the project is to contribute towards the reduction of direct and indirect releases or emissions of ozone depleting substances hcfcs and greenhouse gases hcfcs and hfcs both through promotion of zero ozone depletion potential odp and low global warming potential gwp alternatives as well as promotion of best practices and better. Introductory course to the international legal framework. Concentrations of ozonedepleting substances are expected to decline over the coming century, bringing a gradual recovery of the ozone layer.
767 306 1451 691 1587 1593 1024 10 1288 357 125 654 908 1378 610 674 1215 869 997 1403 62 684 423 415 536 1167 1135 32 805 529 1347 798