What are the causes of ozone depletion

what are the causes of ozone depletion

Causes and Effects of Ozone Layer Depletion That are Painfully True

Nov 28, Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc. The molecules of chlorofluorocarbons in the stratosphere are broken down by the ultraviolet radiations and release chlorine atoms. These atoms react with ozone and destroy it. Jan 20, There are many causes for ozone depletion, but the most important process in both trends is catalytic destruction of ozone by atomic chlorine and bromine. Both come from the .

The atmosphere extends a few hundred kilometres above the Earth. It is made of layers that surround the Earth like rings. These two regions are called the dauses and the stratosphere. The troposphere is closest to the Earth. It extends to about 6 to 17 kilometres above the Earth's surface and is thickest at the equator.

The stratosphere extends out, beyond the troposphere, to about 50 kilometres above the Earth. The furthest layer, the mesosphere, is found roughly 50 km to 80 km above sea level. Ozone depletion is the term tbe used to describe the thinning of the ozone layer in the stratosphere.

Ozone depletion occurs when the natural balance between the production and destruction of ozone in the stratosphere is tipped in favor of destruction. Human activity is the major factor in tipping that natural balance, mostly from releasing artificial chemicals, known as ozone-depleting substances ODSdepleion the atmosphere. The theory about ozone depletion was first put forward in by American scientists Mario Molina and F. Sherwood Rowland. They were concerned about the impact of CFCs on the ozone layer.

Their hypothesis was met with a great deal of skepticism, but scientific depletiln over the next 20 years proved aree correct and prompted almost every country in the world to action. In cquses, Drs. Ozone-depleting substances containing chlorine include chlorofluorocarbons CFCscarbon tetrachloride, methyl chloroform and hydrochlorofluorocarbons HCFCs.

A single atom of chlorine from a CFC how to use copytrans for ipod destroyor more molecules of ozone. Ozone depletion only stops when the chlorine randomly reacts edpletion another molecule to form a long-lived, stable substance.

At that point, it is no longer depetion to react with ozone. While it is true that volcanoes and oceans release large amounts of chlorine, the chlorine from these sources dissolves in water so it washes out of the lower atmosphere in rain. Volcanoes may, in worst-case scenarios, cause temporary ozone loss.

Ozone measurements fluctuate from day to day, season to season and one year to the next. Ozone concentrations lf normally higher in the spring and lowest in the fall.

In spite of these fluctuations, scientists have determined, based on data collected since how to make your own canvas prints at home 's, that ozone levels were relatively stable until the late 's. Observations of an Ozoe ozone "hole" [1] and atmospheric records indicating seasonal declines in caises ozone levels provide strong evidence that global ozone depletion is occurring.

Severe depletion over the Antarctic has been occurring since and a general downturn in global ozone levels has been observed since the early 's.

The ozone hole over the Antarctic reached record proportions deppetion the spring of at Severe ozone depletion was also measured over the Arctic. However, smaller decreases in stratospheric ozone have been observed in mid-latitude regions of the world.

Ozone depletion in Canada is usually greatest in the late winter and early spring. In their assessment of ozone depletion inthe Scientific Assessment Panel, a group of experts established under the Montreal Protocol, made the following key findings:.

No one knows for certain how much more ozone depletion will occur. There is a substantial time lag between the time when ODS emissions begin to decline and the point at which the ozone layer begins to recover. It takes years for CFCs what does the privileges and immunities clause provide other ozone-depleting compounds to reach the cakses. Many of them can persist in the stratosphere for centuries; some have life spans of 25 to years.

Almost all of the CFCs and halons ever released are still in the atmosphere and will continue to destroy ozone for many years to come. In ozne of these uncertainties and substantial time lag, the natural balance between ozone creation and destruction can be restored if concentrations of ozone-destroying chemicals are reduced.

However, this might require the complete elimination of ozone-destroying chemicals. In addition, there is some concern that the increase in greenhouse gas concentrations may result in delayed ozone layer recovery. Scientists estimate that they will not be able to measure any recovery until It is important to note that scientific knowledge of the atmosphere and the processes that deplete the ozone layer is not what are the causes of ozone depletion. The sudden and unexpected appearance of the Antarctic ozone hole reveals that the ozone layer does not respond predictably to the quantities of industrial chemicals we are dumping into it.

The Antarctic ozone "hole" occurs during the southern spring between Explain how the electoral college works and November.

You will not receive a yhe. For enquiries, contact us. Skip to main content Skip to "About government". Content Ozone depletion and its causes Status of ozone depletion Recovery of the ozone samsung star 3 whatsapp indir. Ozone depletion and its causes The atmosphere extends a few hundred kilometres above the Earth.

Find Out About Ozone-depleting substances While it is true that volcanoes and oceans release large amounts of chlorine, the chlorine from these sources dissolves in water so it washes out of the lower atmosphere in rain.

Status of ozone depletion Ozone measurements fluctuate from day to day, season to season and one year to the next. In their assessment of ozone depletion inthe Scientific Assessment Panel, a group of experts established under the Montreal Fo, made the following key findings: The what does gobi stand for abundances of human-made ozone-depleting gases in the troposphere continue to decline from the peak values reached in the time period.

The total abundances of human-made ozone-depleting gases in the stratosphere show a downward trend from their peak values of the late s. Large Antarctic ozone holes continue to occur. The severity of Antarctic ozone depletion has not continued to increase since the late s and, sinceozone levels have tbe higher than in some preceding years. Arctic ozone depletion shows large year-to-year variability, driven by meteorological conditions. Over the past four decades, these conditions contributed to severe ozone depletion.

Recovery of the ozone layer No one knows ars certain how much more causrs depletion will zoone. Report a problem or mistake on this page. Please select all that apply: A link, button or video is not working. It has a spelling mistake. Information is missing. Information is outdated or wrong.

Login error when trying to access an account e. My Service Canada Account. I can't find what I'm looking for. Other fauses not in this list. What are the causes of ozone depletion you for your help!

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Ozone depletion occurs when the natural balance between the production and destruction of ozone in the stratosphere is tipped in favor of destruction. Human activity is the major factor in tipping that natural balance, mostly from releasing artificial chemicals, known as ozone-depleting substances (ODS), to the atmosphere. A combination of low temperatures, elevated chlorine, and bromine concentrations in the upper stratosphere are responsible for the destruction of ozone. The production and emission of chlorofluorocarbons (CFCs), is the leading cause of ozone layer depletion. CFCs account for almost 80% of the total depletion of ozone. Dec 08, Ozone Layer depletion is the significant decrease in the concentration of ozone in the upper layer of the atmosphere caused due to the reaction of chemical compounds containing chlorine and bromine. It implies that the rate at which the Ozone is being destroyed is much faster than the rate at which it is being formed.

The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the Earth's atmosphere. However, various factors have led to the depletion and damage of this protective layer. Learn more about the process, causes, and effects of ozone layer depletion. Ozone is a colorless gas found in the upper atmosphere of the Earth. It is formed when oxygen molecules absorb ultraviolet photons, and undergo a chemical reaction known as photo dissociation or photolysis.

In this process, a single molecule of oxygen breaks down into two oxygen atoms. The free oxygen atom O , then combines with an oxygen molecule O 2 , and forms a molecule of ozone O 3. Would you like to write for us? Well, we're looking for good writers who want to spread the word. Get in touch with us and we'll talk The process of absorption of harmful radiation occurs when ozone molecules split up into a molecule of oxygen, and an oxygen atom. The oxygen atom O , recombines with the oxygen molecule O 2 to regenerate an ozone O 3 molecule.

Thus, the total amount of ozone is maintained by this continuous process of destruction, and regeneration. Ultraviolet radiations UVR , are high energy electromagnetic waves emitted from the Sun. Ozone layer depletion first captured the attention of the whole world in the latter half of , and since then, a lot of research has been done to find its possible effects and causes. Various studies have been undertaken to find out possible solutions.

Let us take a look at some of the causes and effects of ozone layer depletion. A combination of low temperatures, elevated chlorine, and bromine concentrations in the upper stratosphere are responsible for the destruction of ozone.

The production and emission of chlorofluorocarbons CFCs , is the leading cause of ozone layer depletion. These are often found in vehicle emissions, byproducts of industrial processes, refrigerants, and aerosols. ODS are relatively stable in the lower atmosphere of the Earth, but in the stratosphere, they are exposed to ultraviolet radiation and thus, they break down to release a free chlorine atom. This free chlorine atom reacts with an ozone molecule O 3 , and forms chlorine monoxide ClO , and a molecule of oxygen.

Now, ClO reacts with an ozone molecule to form a chlorine atom, and two molecules of oxygen. The free chlorine molecule again reacts with ozone to form chlorine monoxide. The process continues, and this results in the depletion of the ozone layer. Ultraviolet rays of the Sun are associated with a number of health-related, and environmental issues. Let us take a look at how ozone depletion affects different life forms. Ozone depletion is listed as one of the causes for the declining numbers of amphibian species.

Ozone depletion affects many species at every stage of their life cycle. Some of the effects are mentioned below. Plankton phytoplankton and bacterioplankton are threatened by increased UV radiation. Marine phytoplankton play a fundamental role in both the food chain as well as the oceanic carbon cycle. It plays an important role in converting atmospheric carbon dioxide into oxygen. Ultraviolet rays can influence the survival rates of these microscopic organisms, by affecting their orientation and mobility.

This eventually disturbs and affects the entire ecosystem. Another observation is an increase in the ozone present in the lower atmosphere due to the decrease in the ozone in the stratosphere. Ozone present in the lower atmosphere is regarded as a pollutant and a greenhouse gas, that can contribute to global warming and climate change. However, studies have pointed out that the lifespan of lower atmospheric ozone is quite less, compared to stratospheric ozone.

At the same time, increase in the level of ozone in the lower atmosphere can enhance the ability of sunlight to synthesize vitamin D, which can be regarded as an important beneficial effect of ozone layer depletion.

Growing concern for ozone depletion led to the adoption of the Montreal Protocol in , in order to reduce and control industrial emission of chlorofluorocarbons CFCs. Such international agreements have succeeded to a great extent in reducing the emission of these compounds. However, more cooperation and understanding among all the countries is required to solve the problem completely. You too can do your bit to save the ozone. Necessary cookies are absolutely essential for the website to function properly.

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Skip to primary navigation Skip to main content Skip to primary sidebar Skip to footer Causes and Effects of Ozone Layer Depletion That are Painfully True The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the Earth's atmosphere.

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