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