After a decade of relentless enlargement and deepening, it seems that ozone layer depletion might eventually be curbed, and precfc levels of the ozone layer reached by the midtwentyfirst century. The effects of ozone layer depletion are as follows. The causes, mechanism and bio effects of ozone layer depletion on humans were addressed. Health and environmental effects of ozone layer depletion epa. Ppt ozone layer depletion authorstream presentation. Ozone o 3 is a stratospheric layer that plays important role in providing support to humans for their survival. 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. Questions and answers about the effects of the depletion. The main effect of ozone depletion is an increase in uvb rays reaching the earths surface causes. Ozone depletion is allowing the uv radiation to earth surface. The level from which it extends outward varies with latitude. Ozone depletion is primarily caused by human activities.
Ashes can stay in the stratosphere for about two to five years, and within. However, because ozone absorbs solar radiation and is a greenhouse gas, ozone changes and climate change are linked in important ways. Ozone is a gas that is present in the ozone layer in the stratosphere of the earth. That was an alarming situation for environmentalists all over the world because ozone layer depletion is directly proportional to some of the most destructive skin diseases including tumor formation. Man has tried hard to deploy protective measures towards controlling the ozone layer from depletion,but this is so.
Progress report 2003 united nations environment programme, environmental e. These ashes contain high concentration of bromine and chlorine. Do ozone depleting gases and their substitutes have an effect on climate. Ptersa, p o box 915751, faerie glen, 0043, south africa. Frequently asked questions about the ozone layer ozone. Ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is tipped in favour of destruction. Ozone layer depletion, its causes, effects and control. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. The ultraviolet uv rays emitted from sun are captured by ozone and thereby provide a stable ontological structure in the biosphere. Ozone depletion consists of two related events observed since the late 1970s.
In fact stratospheric ozone layer has the ability to filter the uv radiations. Environmental effects of ozone depletion and its interactions with. Ground ozone concentration is lower in polar and equatorial regions. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone layer, of about 4%, per decade. In the upper atmosphere, atmospheric gases absorbs the suns radiation, get ionized, and release molecules. What are the causes and effects of ozone depletion. Project report on ozone depletion environmental pollution. Another most feared aspect of pollution is depletion of ozone layer of the stratosphere. Approximately 90% ozone is present in stratosphere at the height of 10 to 17 kilometer and is called ozone layer while remain ing 10% is present in troposphere 3. Stratospheric ozone depletion leads to an increase in uvb that reach the earths surface, where it can disrupt biological processes and damage a number of materials the fact that uvb can cause biological effects is well demonstrated by the familiar sunburn that follows overexposure to the sun. An ongoing international collaboration the most recent wmounep scientific assessment of ozone depletion. Ozone layer is a thin blanketlike layer that spreads over the atmosphere of the earth.
The ozone layer is a layer of gas consisting of o3 molecules, called ozone it is also known as tri oxygen, that forms when. Environmental effects of ozone depletion ceda document repository. Ozone ozone is a simple molecule of three oxygen atoms and it is present in the two lowest layers of the atmosphere troposphere and stratosphere. It protects us from harmful uv rays that can have serious effects on animals, biodiversity and peoples health, including skin cancer and eye cataract. As the eruption of mount pinatubo proved in 1991, natural eruptions can have a dramatic negative effect on the manmade ozone layer depletion chemicals that are in the atmosphere. Experts blame ozonelayer depletion on manmade chem icals containing. There, it will absorb almost all ultraviolet light which is harmful to many organisms. Ozone layer depletion, its causes and its effects free download as powerpoint presentation. Causes, effects and solutions of ozone layer depletion.
In fact whole world is vulnerable to its after affects. Laboratory and epidemiological studies demonstrate that uvb causes nonmelanoma skin cancer and plays a major role in malignant melanoma development. The maps were produced with data collected by statellite istruments, including the ozone monitoring instrument on the aura satellite. These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. Life is protected from uv rays by stratospheric ozone layer which acts as a shield or sun screen 2. Depletion to ozone layer depletion does not affect a region or a country. Timeline of stratospheric ozone depletion and observations. List of books and articles about ozone layer online. Cfcs nonflammable nontoxic trap heat good insulators. There are many situations where human activities have. The increase in the levels of uv rays lead to high rate of skin cancer and eye related problems. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. When volcanoes erupt, they produce massive clouds of ashes into the troposphere, and then they drift upward into the stratosphere the upper atmosphere layer where ozone gas protects humans from uv radiation. The ozone layer protects the surface of the earth and its phenomena from stray rays from the sun.
Is depletion of the ozone layer the principal cause. Ozone depletion facts and information national geographic. The earths ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30. Ozone is the layer present in stratosphere which protects the life on earth from harmful effects of uv radiations. The environmental effects assessment panel report for 2006. The ozone hole is shown in purple above the antarctic on sept. The ozone layer helps to protect life from harmful ultraviolet radiation. Concentrations of ozonedepleting substances are expected to decline over the coming century, bringing a gradual. In lower atmosphere, atmospheric oxygen get dissociated and subsequently combines with molecular oxygen of the. What is the impact of volcanic ash on the ozone layer.
Causes of ozone layer depletion and its effects on human. The montreal protocol on substances that deplete the ozone layer requires periodic. The latter phenomenon is referred to as the ozone hole. The exposure to these radiations is severely affecting all life forms on earth. The upper layer of the atmosphere surrounded by ozone 15 to 30 kms is known as ozonosphere. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. Ozone layer is also naturally broken down but there is a balance between its formation and natural depletion. The thinning is most pronounced in the polar regions, especially over antarctica. The ozone layer prevents most ultraviolet uv and other highenergy radiation from penetrating to the earths surface but does. Faqs 1 questions and answers about the effects of the depletion of the ozone layer on humans and the environment.
Pdf causes of ozone layer depletion and its effects on. Within the stratosphere, the ozone layer is the portion that contains the highest. The ozone molecule contains three atoms of oxygen and is mainly formed by the action of. Ozone depletion simple english wikipedia, the free. We often think of ozone layer depletion as a modern problem, but it. The ozone layer acts as a natural filter, absorbing most of the suns burning ultraviolet uv rays. Ozone layer depletion increases the amount of uvb that reaches the earths surface. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2.
The ozone layer is not really a layer at all, but has become known as such because most ozone particles are scattered between 19 and 30 kilometers 12 to 30 miles up in the earths atmosphere, in a region called the stratosphere. Ozone layer depletion causes, effects and solutions 7. Human health effects include the incidence of skin cancer, cataracts and an impairment of the immune system. The ozone layer is a belt of the naturallyoccuring gas ozone that sits. 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. The natural distribution of ozone around the earth is. Scribd is the worlds largest social reading and publishing site. The subtropical ground ozone concentration in northern hemisphere is twice the corresponding region in southern hemisphere 5. Ozone o3 is a stratospheric layer that plays important role in providing support to humans for their survival. No, ozone depletion itself is not the principal cause of climate change.
Ozone layer present in the stratosphere protects the earth from harmful ultraviolet rays coming from the sun. The troposphere extends from the surface of the earth upto 12 km and stratosphere extends upto about 50 km from the surface of the. Since the first assessments in 1989, the complexity of the link ages between ozone depletion, uvb radiation and climate. Project ozone layer depletion pdf the stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. The enduring effects of ozone depletion the new york times. Is depletion of the ozone layer the principal cause of climate change. The term ozone depletion can refer to a number of distinct, but related phenomena. Ozone layer depletion was first identified in late 1970s and the scientists claimed that 4% of the total ozone has been destroying per decade. Lee and steven feldstein, professors at penn state, provide evidence that the depletion of the ozone layer, even more than greenhouse gas emissions, is contributing to the observed movement of the southern jet stream toward the pole. Ozone layer depletion, its causes and its effects ozone. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. Case study on ozone layer free download as powerpoint presentation. This ozone layer sustains life on the earth by absorbing a great deal of uv ultra violet light radiating out of sun.
Causes of ozone depletion causes and effects of ozone. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. Effects of ozone layer depletion let us see a few possible effects of the ozone layer depletion on the earths environment and also on the plants and animals. The gradual thinning, reduction, or wearing out of the ozone layer in the stratosphere due to various human activities is called ozone depletion. Find answers to frequently asked questions about the ozone layer, ozone depletion, and the effects of ozone depletion on health and the environment. Pdf there are many situations where human activities have significant effects on the environment. It is an essential factor for many global, biological and environmental phenomena. Effects and measures to protect ozone layer depletion. Protecting the ozone layer department of the environment. The envelope of air or different types of gases surrounding the earth is known as atmosphere. The thickness of the ozone layer is measured in dobson units du. 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.
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. Health and environmental effects of ozone layer depletion. Ozone in the ozone layer is formed by the action of solar ultraviolet light on oxygen. Pdf causes of ozone layer depletion and its effects on human.
It allows only the required doses of the suns solar energy to reach the earths surface. The depletion of ozone layer allows entering of uv rays from sun into the earths atmosphere which is associated with a number of health related and environmental issues. As a result the total amount of ozone remains constant. Ozone layer is a protective stratospheric layer, also known as ozone umbrella. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion.