Depletion of ozone layer ( practice) .pdf
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The ozone layer, located 9 to 18 miles above the Earth's surface, absorbs UV radiation from the sun and protects the planet. It is being depleted as chlorine and bromine atoms from industrial pollutants destroy ozone molecules faster than they can be replenished, with one chlorine atom able to destroy over 100,000 ozone molecules. Depletion of the ozone layer allows more UV radiation to reach the Earth's surface, increasing risks of skin cancer, cataracts, and harm to crops and marine life.
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Ozone Layer.pptx
Ozone (O3) is a molecule made up of three atoms of oxygen (O), and very reactive gas.
Bluish gas that harmful to breathe.
Is mostly found in the stratosphere, where it protects us from the Sun’s harmful ultraviolet (UV) radiation.
Although it represents only a tiny fraction of the atmosphere, ozone is essential for life on Earth.
Ozone in the stratosphere— a layer of the atmosphere between 15 and 50 kilometers (10 and 31 miles) above us—acts as a shield to protect Earth’s surface from the sun’s harmful ultraviolet radiation.
Ozone Layer by Mahesh Joshi
This is my PPT presented during my M.Sc Environmental Science Course at Department of Environmental Science, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, Maharashtra, India.
OZONE LAYER
This document discusses the ozone layer and ozone layer depletion. It begins by explaining that the ozone layer is a region in the stratosphere that absorbs UV radiation from the sun. It was discovered in 1913 by French physicists. The ozone layer is composed of 3 oxygen atoms and absorbs 97-99% of medium-frequency UV light. It is located 15-35 km above the Earth. The document then discusses what causes ozone layer depletion, noting that CFCs released chemicals that react with ozone and break it down. Finally, it outlines the human health and environmental effects of ozone layer depletion, such as increased skin cancer and effects on plant growth.
The ozone hole
The document discusses the ozone layer, including its location in the stratosphere above the Earth's surface, where it protects life from UV radiation. It describes how CFCs were destroying the ozone layer by being carried into the stratosphere where UV radiation breaks them apart and the chlorine atoms then destroy ozone molecules. In response, the international community enacted the Vienna Convention in 1985 and Montreal Protocol in 1987 to ban CFCs and help the ozone layer recover.
Ozone Layer: The Shield in the Sky
Abstract: There are many situations where human activitieshave significant effects on the environment. Ozone layerdamage is one of them. The objective of this paper is to reviewthe origin, causes, mechanisms and bio effects of ozone layerdepletion as well as the protective measures of this vanishing layer. The chlorofluorocarbon and the halons are potent ozone depletors. One of the main reasons for the widespread concernabout depletion of the ozone layer is the anticipated increase inthe amounts of ultraviolet radiation received at the surface ofthe earth and the effect of this on human health and on the environment. The prospects of ozone recovery remain uncertain. In the absence of other changes, stratospheric ozoneabundances should rise in the future as the halogen loading fallsin response to regulation. However, the future behaviour ofozone will also be affected by the changing atmospheric abundances of methane, nitrous oxide, water vapour, sulphateaerosol, and changing climate.
Presentation on ozone depletion
Ozone is a bluish gas composed of three oxygen atoms that exists in two main layers in the atmosphere. The majority of ozone exists in the stratosphere, where it forms the ozone layer that protects life on Earth by absorbing harmful ultraviolet radiation. Ozone depletion occurs when chlorofluorocarbons released by industry break down in the stratosphere, releasing chlorine atoms that destroy ozone molecules. This depletion increases ultraviolet radiation at the surface with negative impacts on human health, agriculture, plants, animals and materials. International agreements like the Montreal Protocol have led countries to ban ozone-depleting substances to prevent further damage to the protective ozone layer.
Ozone layer depletion
This document discusses the ozone layer and ozone depletion. It begins by introducing the student's name and department. It then provides background on the ozone layer, noting that most ozone is found in the stratosphere between 19-30km, forming the ozone layer.
The document discusses the layers of the atmosphere and the roles of the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. It explains that the ozone layer in the stratosphere absorbs harmful UV rays from the sun. The document also covers causes of ozone depletion like CFCs, effects of ozone depletion like skin cancer, and international agreements to regulate ozone-depleting chemicals like the Montreal
Ozone.pptx psg
Ozone is a naturally occurring gas composed of three oxygen atoms that exists in two forms: good ozone in the stratosphere protects life from UV rays, while bad ground-level ozone is a air pollutant. The ozone layer is being depleted by CFCs from industry which release chlorine that destroys ozone. This increases harmful UV rays and affects ecosystems, climate, and humans through higher skin cancer risk. Large seasonal ozone depletions over the poles are called ozone holes. The only solution is to eliminate CFCs and other ozone-depleting chemicals by following the Montreal Protocol.
Recommended
Ozone Layer.pptx
Ozone (O3) is a molecule made up of three atoms of oxygen (O), and very reactive gas.
Bluish gas that harmful to breathe.
Is mostly found in the stratosphere, where it protects us from the Sun’s harmful ultraviolet (UV) radiation.
Although it represents only a tiny fraction of the atmosphere, ozone is essential for life on Earth.
Ozone in the stratosphere— a layer of the atmosphere between 15 and 50 kilometers (10 and 31 miles) above us—acts as a shield to protect Earth’s surface from the sun’s harmful ultraviolet radiation.
Ozone Layer by Mahesh Joshi
This is my PPT presented during my M.Sc Environmental Science Course at Department of Environmental Science, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, Maharashtra, India.
OZONE LAYER
This document discusses the ozone layer and ozone layer depletion. It begins by explaining that the ozone layer is a region in the stratosphere that absorbs UV radiation from the sun. It was discovered in 1913 by French physicists. The ozone layer is composed of 3 oxygen atoms and absorbs 97-99% of medium-frequency UV light. It is located 15-35 km above the Earth. The document then discusses what causes ozone layer depletion, noting that CFCs released chemicals that react with ozone and break it down. Finally, it outlines the human health and environmental effects of ozone layer depletion, such as increased skin cancer and effects on plant growth.
The ozone hole
The document discusses the ozone layer, including its location in the stratosphere above the Earth's surface, where it protects life from UV radiation. It describes how CFCs were destroying the ozone layer by being carried into the stratosphere where UV radiation breaks them apart and the chlorine atoms then destroy ozone molecules. In response, the international community enacted the Vienna Convention in 1985 and Montreal Protocol in 1987 to ban CFCs and help the ozone layer recover.
Ozone Layer: The Shield in the Sky
Abstract: There are many situations where human activitieshave significant effects on the environment. Ozone layerdamage is one of them. The objective of this paper is to reviewthe origin, causes, mechanisms and bio effects of ozone layerdepletion as well as the protective measures of this vanishing layer. The chlorofluorocarbon and the halons are potent ozone depletors. One of the main reasons for the widespread concernabout depletion of the ozone layer is the anticipated increase inthe amounts of ultraviolet radiation received at the surface ofthe earth and the effect of this on human health and on the environment. The prospects of ozone recovery remain uncertain. In the absence of other changes, stratospheric ozoneabundances should rise in the future as the halogen loading fallsin response to regulation. However, the future behaviour ofozone will also be affected by the changing atmospheric abundances of methane, nitrous oxide, water vapour, sulphateaerosol, and changing climate.
Presentation on ozone depletion
Ozone is a bluish gas composed of three oxygen atoms that exists in two main layers in the atmosphere. The majority of ozone exists in the stratosphere, where it forms the ozone layer that protects life on Earth by absorbing harmful ultraviolet radiation. Ozone depletion occurs when chlorofluorocarbons released by industry break down in the stratosphere, releasing chlorine atoms that destroy ozone molecules. This depletion increases ultraviolet radiation at the surface with negative impacts on human health, agriculture, plants, animals and materials. International agreements like the Montreal Protocol have led countries to ban ozone-depleting substances to prevent further damage to the protective ozone layer.
Ozone layer depletion
This document discusses the ozone layer and ozone depletion. It begins by introducing the student's name and department. It then provides background on the ozone layer, noting that most ozone is found in the stratosphere between 19-30km, forming the ozone layer.
The document discusses the layers of the atmosphere and the roles of the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. It explains that the ozone layer in the stratosphere absorbs harmful UV rays from the sun. The document also covers causes of ozone depletion like CFCs, effects of ozone depletion like skin cancer, and international agreements to regulate ozone-depleting chemicals like the Montreal
Ozone.pptx psg
Ozone is a naturally occurring gas composed of three oxygen atoms that exists in two forms: good ozone in the stratosphere protects life from UV rays, while bad ground-level ozone is a air pollutant. The ozone layer is being depleted by CFCs from industry which release chlorine that destroys ozone. This increases harmful UV rays and affects ecosystems, climate, and humans through higher skin cancer risk. Large seasonal ozone depletions over the poles are called ozone holes. The only solution is to eliminate CFCs and other ozone-depleting chemicals by following the Montreal Protocol.
Greenhouse gases and global warming by MUHAMMAD FAHAD ANSARI 12IEEM 14
The document discusses ozone depletion and its causes and health effects. It explains that ozone, comprised of 3 oxygen molecules (O3), is found in the stratosphere and absorbs harmful UV radiation. Pollution containing CFCs and other compounds deplete the ozone layer by releasing chlorine and bromine when broken down by UV light, which then break down over 100,000 ozone molecules. As the ozone layer thins, more UV radiation reaches the Earth's surface, increasing health risks like skin cancer.
bio ozone
The document summarizes information about the ozone layer. It discusses that the ozone layer is located in the lower stratosphere and absorbs 97-99% of the sun's harmful ultraviolet rays. It also describes how ozone is created and maintained through an oxygen cycle but can be depleted by chlorine and bromine compounds from CFCs. The depletion of ozone has consequences like increased skin cancer risk for humans and impacts on agriculture and plankton.
OZONE DEPLETION
The ozone layer is a layer in Earth's atmosphere that contains ozone, which is a molecule made up of three oxygen atoms. It is located in the stratosphere, approximately 15-35km above Earth's surface. The ozone layer absorbs 97-99% of the sun's harmful ultraviolet radiation, protecting life on Earth. Depletion of the ozone layer allows more UV radiation to reach the surface, increasing health and environmental risks. Significant ozone depletion has occurred since the 1970s due to man-made chemicals like CFCs released into the atmosphere. CFCs and other ozone-depleting substances break down in the stratosphere to release chlorine and bromine atoms which destroy ozone molecules
ozone depletion
The ozone layer is a layer in Earth's atmosphere that contains ozone, which is a molecule made up of three oxygen atoms. It is located in the stratosphere, approximately 15-35km above Earth's surface. The ozone layer absorbs 97-99% of the sun's harmful ultraviolet radiation, protecting life on Earth. Depletion of the ozone layer allows more UV radiation to reach the surface, increasing health and environmental risks. Significant ozone layer depletion has occurred since the 1970s due to man-made chemicals like CFCs released into the atmosphere. CFCs and other ozone depleting substances break down in the stratosphere to release chlorine and bromine atoms which destroy ozone molecules
Ozone
Ozone (O3) is a bluish gas composed of three oxygen atoms that forms a protective layer in the stratosphere. It is produced through chemical reactions involving oxygen and ultraviolet radiation from the sun. Nearly 90% of Earth's ozone is found in the ozone layer between 15-30 km above the surface. The ozone layer protects life on Earth by absorbing harmful ultraviolet radiation from the sun. Depletion of the ozone layer is caused primarily by chlorofluorocarbons (CFCs) released into the atmosphere from industry. CFCs rise into the stratosphere where UV light breaks them down, releasing chlorine atoms that catalyze the destruction of ozone molecules. Ozone depletion increases risks
3. Ozonosfer.ppt
The document discusses the ozone layer and the Antarctic ozone hole. It explains that the ozone layer formed over time as oxygen accumulated in the atmosphere from photosynthesis. The ozone layer peaks between 20-30km above Earth's surface and protects life from UV radiation. In the 1980s, scientists discovered an ozone hole forming over Antarctica each spring caused by chlorofluorocarbons reacting with ozone. The Montreal Protocol was enacted to phase out CFC production and allow the ozone layer to recover over the coming decades. However, the ozone hole will persist for some time due to CFCs' long lifetime in the atmosphere.
Ozone depletion
This document summarizes a seminar on ozone depletion presented by Ravi Singh Jadaun on March 23, 2017 at Jiwanji University in Gwalior, India. It defines the ozone layer, discusses its structure and history. It then explains the causes of ozone depletion, both natural and man-made, focusing on ozone depleting substances like CFCs. The effects of depletion on human health, the environment, marine life and animals are outlined. Finally, solutions to reduce depletion like banning pesticides and using public transportation are proposed.
Ozone layer depletion
The document summarizes information about ozone layer depletion. The main causes of ozone layer depletion are chlorofluorocarbons (CFCs) released by products like aerosols and refrigerants, as well as rocket launches. CFCs release chlorine atoms that react with and destroy ozone. Effects of ozone layer depletion include increased skin cancer and eye damage for humans, and problems for plants. Prevention efforts include reducing CFC emissions, saving energy, and increasing awareness. The 2019 ozone hole over Antarctica was the smallest on record due to abnormal weather patterns.
A power point presentation on ozone depletion
The document discusses ozone depletion and the ozone hole over Antarctica. It describes how ozone depletion occurs through a catalytic process caused by chlorine and bromine compounds released by CFCs and other chemicals in the stratosphere. Increased UV radiation due to ozone depletion can cause skin cancer in humans, damage plants and plankton populations, and affect climate patterns globally. The Montreal Protocol banned CFCs and other ozone depleting substances to address the problem.
7.75 - Ozone Depletion
Ozone occurs naturally in both the troposphere and stratosphere. Stratospheric ozone is beneficial as it filters out UV radiation and protects life on Earth. However, certain man-made pollutants called ozone-depleting substances have led to a thinning of the ozone layer, especially over Antarctica where it forms an "ozone hole". This depletion increases UV radiation levels and poses risks to human health, agriculture, and marine life. In response, the 1989 Montreal Protocol was enacted to phase out ozone-depleting substances, though full recovery of the ozone layer is not expected until 2050.
Ozone depletion and imacts
The document discusses ozone depletion and its impacts. It defines the ozone layer and explains its importance in protecting life on Earth from UV radiation. Ozone depletion occurs when chlorofluorocarbons (CFCs) released into the atmosphere break down ozone molecules. This allows more UV radiation to reach the surface, affecting global warming, human health, agriculture, and marine ecosystems. The document traces the history of ozone depletion research and international agreements like the Montreal Protocol to regulate CFC emissions and limit further damage to the ozone layer.
Ozone Layer: Its Depletion and Impacts
The document discusses ozone layer depletion and its impacts. It explains that ozone, a form of oxygen, protects the Earth from UV radiation. However, industrial emissions like chlorofluorocarbons released from refrigerants and aerosols are depleting the ozone layer. This depletion is most severe over the polar regions, where it forms ozone holes. Ozone layer depletion leads to increased UV radiation reaching the Earth's surface, which can harm animal and plant life and increase human health risks like skin cancer. International agreements like the Montreal Protocol have sought to regulate ozone-depleting substances to help protect the ozone layer.
The ozone layer and its depletion
The document summarizes information about the ozone layer and its depletion. It discusses how the ozone layer protects the Earth from ultraviolet radiation from the sun. It then explains how chlorofluorocarbons (CFCs) were depleting the ozone layer when they were released into the atmosphere. CFCs break down ozone molecules in the stratosphere. The document also outlines observations that show the ozone layer depletion peaked around 2010 and is expected to fully recover by 2065 as CFC use has been restricted by the Montreal Protocol.
Ozone layer - Guardian of our planet /importance of it/depletion and recovery...
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere (see details below). ... CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity.
The ozone layer that shields life from cancer-causing solar rays is recovering at a rate of one to three percent per decade, reversing years of dangerous depletion caused by the release of harmful chemicals, a U.N. study said on November 5. “The Antarctic ozone hole is recovering, while continuing to occur every year.
Ozone
The document discusses the ozone layer, its importance in shielding the Earth from UV radiation, and the threats to it. It notes that ozone is found mainly in the stratosphere, where it forms the ozone layer between 6-30 miles above the surface. The ozone layer absorbs most of the sun's UV rays and plays a key role in atmospheric temperature. However, chlorofluorocarbons and other ozone-depleting substances have damaged the ozone layer, leading to the Antarctic ozone hole. This depletion increases UV levels and can harm both human health and the environment. International agreements like the Montreal Protocol have sought to phase out ozone-harming chemicals and find alternatives.
Ozone
The document discusses the ozone layer, its importance in shielding the Earth from UV radiation, and the threats to it. It notes that ozone is found mainly in the stratosphere, where it forms the ozone layer between 6-30 miles above the surface. The ozone layer absorbs most of the sun's UV rays and plays a key role in atmospheric temperature. However, chlorofluorocarbons and other ozone-depleting substances have damaged the ozone layer, leading to the Antarctic ozone hole. This depletion increases UV levels and can harm both human health and the environment. International agreements like the Montreal Protocol have sought to phase out ozone-harming chemicals and find alternatives.
The ozone layer
The document discusses the ozone layer, including what it is, where it is located, and why it is important for life on Earth. It protects the Earth from harmful ultraviolet radiation from the sun. The ozone layer is being affected by human emissions of chlorofluorocarbons (CFCs), which are destroying the ozone. This is leading to thinning of the ozone layer and the formation of an ozone hole over Antarctica. The consequences of ozone depletion include increased skin cancer risks and other health impacts. Humans can help protect themselves from UV radiation by wearing sunscreen, hats, and sunglasses when outside.
From the advantage of COVID-19
Ozone is a gas composed of three oxygen atoms that protects the Earth from harmful ultraviolet rays. It is present in the atmosphere but is unstable. Halogen gases like chlorine and bromine can deplete the ozone layer by breaking down ozone molecules. Human activities that release ozone-depleting substances such as CFCs from industries negatively impact the ozone layer. However, reduced pollution from decreased human activities during the COVID-19 pandemic has led to cleaner air and may positively impact the ozone layer.
Presentation (1)-1.pdf
The document discusses a presentation given on World Ozone Day about the ozone layer. It provides background on the ozone layer, noting that it protects life on Earth by absorbing 97-99% of harmful UV radiation from the sun. It then summarizes the five layers of the atmosphere, with an emphasis on the stratosphere where the ozone layer is located. The document outlines some of the main causes of ozone layer depletion including chlorofluorocarbons and other ozone depleting substances, as well as the harmful effects of depletion on human health, animals, plants, and marine life.
Ozone Day Program at CSMA Hr.Sec.School MM Koviloor
The ozone layer protects life on Earth by absorbing ultraviolet radiation from the Sun. Ozone is produced in the stratosphere when oxygen molecules are broken apart by sunlight and reform as three-molecule ozone. The ozone layer absorbs UV light and prevents it from reaching the surface of the Earth, where it can damage DNA and cause harm. In the 1980s, scientists discovered that chlorofluorocarbons (CFCs) were depleting the ozone layer by breaking ozone molecules apart. The 1987 Montreal Protocol banned CFCs and other ozone-depleting substances, and recent data shows the ozone layer is beginning to recover as a result of this global agreement.
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Greenhouse gases and global warming by MUHAMMAD FAHAD ANSARI 12IEEM 14
The document discusses ozone depletion and its causes and health effects. It explains that ozone, comprised of 3 oxygen molecules (O3), is found in the stratosphere and absorbs harmful UV radiation. Pollution containing CFCs and other compounds deplete the ozone layer by releasing chlorine and bromine when broken down by UV light, which then break down over 100,000 ozone molecules. As the ozone layer thins, more UV radiation reaches the Earth's surface, increasing health risks like skin cancer.
bio ozone
The document summarizes information about the ozone layer. It discusses that the ozone layer is located in the lower stratosphere and absorbs 97-99% of the sun's harmful ultraviolet rays. It also describes how ozone is created and maintained through an oxygen cycle but can be depleted by chlorine and bromine compounds from CFCs. The depletion of ozone has consequences like increased skin cancer risk for humans and impacts on agriculture and plankton.
OZONE DEPLETION
The ozone layer is a layer in Earth's atmosphere that contains ozone, which is a molecule made up of three oxygen atoms. It is located in the stratosphere, approximately 15-35km above Earth's surface. The ozone layer absorbs 97-99% of the sun's harmful ultraviolet radiation, protecting life on Earth. Depletion of the ozone layer allows more UV radiation to reach the surface, increasing health and environmental risks. Significant ozone depletion has occurred since the 1970s due to man-made chemicals like CFCs released into the atmosphere. CFCs and other ozone-depleting substances break down in the stratosphere to release chlorine and bromine atoms which destroy ozone molecules
ozone depletion
The ozone layer is a layer in Earth's atmosphere that contains ozone, which is a molecule made up of three oxygen atoms. It is located in the stratosphere, approximately 15-35km above Earth's surface. The ozone layer absorbs 97-99% of the sun's harmful ultraviolet radiation, protecting life on Earth. Depletion of the ozone layer allows more UV radiation to reach the surface, increasing health and environmental risks. Significant ozone layer depletion has occurred since the 1970s due to man-made chemicals like CFCs released into the atmosphere. CFCs and other ozone depleting substances break down in the stratosphere to release chlorine and bromine atoms which destroy ozone molecules
Ozone
Ozone (O3) is a bluish gas composed of three oxygen atoms that forms a protective layer in the stratosphere. It is produced through chemical reactions involving oxygen and ultraviolet radiation from the sun. Nearly 90% of Earth's ozone is found in the ozone layer between 15-30 km above the surface. The ozone layer protects life on Earth by absorbing harmful ultraviolet radiation from the sun. Depletion of the ozone layer is caused primarily by chlorofluorocarbons (CFCs) released into the atmosphere from industry. CFCs rise into the stratosphere where UV light breaks them down, releasing chlorine atoms that catalyze the destruction of ozone molecules. Ozone depletion increases risks
3. Ozonosfer.ppt
The document discusses the ozone layer and the Antarctic ozone hole. It explains that the ozone layer formed over time as oxygen accumulated in the atmosphere from photosynthesis. The ozone layer peaks between 20-30km above Earth's surface and protects life from UV radiation. In the 1980s, scientists discovered an ozone hole forming over Antarctica each spring caused by chlorofluorocarbons reacting with ozone. The Montreal Protocol was enacted to phase out CFC production and allow the ozone layer to recover over the coming decades. However, the ozone hole will persist for some time due to CFCs' long lifetime in the atmosphere.
Ozone depletion
This document summarizes a seminar on ozone depletion presented by Ravi Singh Jadaun on March 23, 2017 at Jiwanji University in Gwalior, India. It defines the ozone layer, discusses its structure and history. It then explains the causes of ozone depletion, both natural and man-made, focusing on ozone depleting substances like CFCs. The effects of depletion on human health, the environment, marine life and animals are outlined. Finally, solutions to reduce depletion like banning pesticides and using public transportation are proposed.
Ozone layer depletion
The document summarizes information about ozone layer depletion. The main causes of ozone layer depletion are chlorofluorocarbons (CFCs) released by products like aerosols and refrigerants, as well as rocket launches. CFCs release chlorine atoms that react with and destroy ozone. Effects of ozone layer depletion include increased skin cancer and eye damage for humans, and problems for plants. Prevention efforts include reducing CFC emissions, saving energy, and increasing awareness. The 2019 ozone hole over Antarctica was the smallest on record due to abnormal weather patterns.
A power point presentation on ozone depletion
The document discusses ozone depletion and the ozone hole over Antarctica. It describes how ozone depletion occurs through a catalytic process caused by chlorine and bromine compounds released by CFCs and other chemicals in the stratosphere. Increased UV radiation due to ozone depletion can cause skin cancer in humans, damage plants and plankton populations, and affect climate patterns globally. The Montreal Protocol banned CFCs and other ozone depleting substances to address the problem.
7.75 - Ozone Depletion
Ozone occurs naturally in both the troposphere and stratosphere. Stratospheric ozone is beneficial as it filters out UV radiation and protects life on Earth. However, certain man-made pollutants called ozone-depleting substances have led to a thinning of the ozone layer, especially over Antarctica where it forms an "ozone hole". This depletion increases UV radiation levels and poses risks to human health, agriculture, and marine life. In response, the 1989 Montreal Protocol was enacted to phase out ozone-depleting substances, though full recovery of the ozone layer is not expected until 2050.
Ozone depletion and imacts
The document discusses ozone depletion and its impacts. It defines the ozone layer and explains its importance in protecting life on Earth from UV radiation. Ozone depletion occurs when chlorofluorocarbons (CFCs) released into the atmosphere break down ozone molecules. This allows more UV radiation to reach the surface, affecting global warming, human health, agriculture, and marine ecosystems. The document traces the history of ozone depletion research and international agreements like the Montreal Protocol to regulate CFC emissions and limit further damage to the ozone layer.
Ozone Layer: Its Depletion and Impacts
The document discusses ozone layer depletion and its impacts. It explains that ozone, a form of oxygen, protects the Earth from UV radiation. However, industrial emissions like chlorofluorocarbons released from refrigerants and aerosols are depleting the ozone layer. This depletion is most severe over the polar regions, where it forms ozone holes. Ozone layer depletion leads to increased UV radiation reaching the Earth's surface, which can harm animal and plant life and increase human health risks like skin cancer. International agreements like the Montreal Protocol have sought to regulate ozone-depleting substances to help protect the ozone layer.
The ozone layer and its depletion
The document summarizes information about the ozone layer and its depletion. It discusses how the ozone layer protects the Earth from ultraviolet radiation from the sun. It then explains how chlorofluorocarbons (CFCs) were depleting the ozone layer when they were released into the atmosphere. CFCs break down ozone molecules in the stratosphere. The document also outlines observations that show the ozone layer depletion peaked around 2010 and is expected to fully recover by 2065 as CFC use has been restricted by the Montreal Protocol.
Ozone layer - Guardian of our planet /importance of it/depletion and recovery...
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere (see details below). ... CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity.
The ozone layer that shields life from cancer-causing solar rays is recovering at a rate of one to three percent per decade, reversing years of dangerous depletion caused by the release of harmful chemicals, a U.N. study said on November 5. “The Antarctic ozone hole is recovering, while continuing to occur every year.
Ozone
The document discusses the ozone layer, its importance in shielding the Earth from UV radiation, and the threats to it. It notes that ozone is found mainly in the stratosphere, where it forms the ozone layer between 6-30 miles above the surface. The ozone layer absorbs most of the sun's UV rays and plays a key role in atmospheric temperature. However, chlorofluorocarbons and other ozone-depleting substances have damaged the ozone layer, leading to the Antarctic ozone hole. This depletion increases UV levels and can harm both human health and the environment. International agreements like the Montreal Protocol have sought to phase out ozone-harming chemicals and find alternatives.
Ozone
The document discusses the ozone layer, its importance in shielding the Earth from UV radiation, and the threats to it. It notes that ozone is found mainly in the stratosphere, where it forms the ozone layer between 6-30 miles above the surface. The ozone layer absorbs most of the sun's UV rays and plays a key role in atmospheric temperature. However, chlorofluorocarbons and other ozone-depleting substances have damaged the ozone layer, leading to the Antarctic ozone hole. This depletion increases UV levels and can harm both human health and the environment. International agreements like the Montreal Protocol have sought to phase out ozone-harming chemicals and find alternatives.
The ozone layer
The document discusses the ozone layer, including what it is, where it is located, and why it is important for life on Earth. It protects the Earth from harmful ultraviolet radiation from the sun. The ozone layer is being affected by human emissions of chlorofluorocarbons (CFCs), which are destroying the ozone. This is leading to thinning of the ozone layer and the formation of an ozone hole over Antarctica. The consequences of ozone depletion include increased skin cancer risks and other health impacts. Humans can help protect themselves from UV radiation by wearing sunscreen, hats, and sunglasses when outside.
From the advantage of COVID-19
Ozone is a gas composed of three oxygen atoms that protects the Earth from harmful ultraviolet rays. It is present in the atmosphere but is unstable. Halogen gases like chlorine and bromine can deplete the ozone layer by breaking down ozone molecules. Human activities that release ozone-depleting substances such as CFCs from industries negatively impact the ozone layer. However, reduced pollution from decreased human activities during the COVID-19 pandemic has led to cleaner air and may positively impact the ozone layer.
Presentation (1)-1.pdf
The document discusses a presentation given on World Ozone Day about the ozone layer. It provides background on the ozone layer, noting that it protects life on Earth by absorbing 97-99% of harmful UV radiation from the sun. It then summarizes the five layers of the atmosphere, with an emphasis on the stratosphere where the ozone layer is located. The document outlines some of the main causes of ozone layer depletion including chlorofluorocarbons and other ozone depleting substances, as well as the harmful effects of depletion on human health, animals, plants, and marine life.
Ozone Day Program at CSMA Hr.Sec.School MM Koviloor
The ozone layer protects life on Earth by absorbing ultraviolet radiation from the Sun. Ozone is produced in the stratosphere when oxygen molecules are broken apart by sunlight and reform as three-molecule ozone. The ozone layer absorbs UV light and prevents it from reaching the surface of the Earth, where it can damage DNA and cause harm. In the 1980s, scientists discovered that chlorofluorocarbons (CFCs) were depleting the ozone layer by breaking ozone molecules apart. The 1987 Montreal Protocol banned CFCs and other ozone-depleting substances, and recent data shows the ozone layer is beginning to recover as a result of this global agreement.
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- 1. 'Depletion of ozone layer' In this presentation we shall talk about the ozone layer and its depletion .
- 2. What is the ozone layer ? The Earth's atmosphere is composed of several layers. Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth's surface The ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet's surface. Most importantly, it absorbs the portion of UV light called UVB, UVB has been linked to many harmful effects including skin cancers, cataracts, and harm to some crops and marine life.
- 3. Why is it depleting ? When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere. Ozone can be destroyed more quickly than it is naturally created.