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Ozone Depletion

Hannah alex and Pamela

pamela sharma

on 30 April 2010

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Transcript of Ozone Depletion

Ozone Depletion By: Pamela Sharma, Hannah Sheperd and Alex Ennes o o o O3 Causes of Ozone Depletion Mainly broken down by Chlorofluorocarbons (CFC) and Nitrogen Oxides CFC's are a man made chemical that are used in hairsprays, airconditioners, perfumes, furniture polishers and more. Its main function is to absorb some of the ultraviolet (UV) rays that enter the atmosphere, so a dangerous amount of UV rays cannot reach the earth. What the Ozone Does What is relates too The Earth's atmosphere is made up of different layers. The layer closest to the surface is called the troposphere which extends from the Earth's surface up to about 10 kilometers. The ozone layer is located above the troposphere in the stratosphere What is the Ozone? Scientist's are concerned that continued global warming will accelerate ozone destruction and increase stratospheric ozone depletion. Ozone depletion gets worse when the stratosphere (where the ozone layer is), becomes colder. Because global warming traps heat in the troposphere, less heat reaches the stratosphere which will make it colder. Greenhouse gases act like a blanket for the troposphere and make the stratosphere colder. In other words, global warming can make ozone depletion much worse right when it is supposed to begin its recovery during the next century. Some Fun Facts :D Approximately 92 million people are expected to become refugees from global warming and climate change by 2100, not including any added from population growth. Antarctica the biggest hole in the Ozone is directly above Antarctica UV-B radiation from ozone depletion damages both plants and animals. the hole over Antarctic is a warning that if conditions get worse: cooler stratospheric temperatures, more stratospheric clouds, more active chlorine:then global ozone will decrease at a much greater pace. When the Antarctic ozone hole does break-up, the ozone-depleted air drifts out into nearby areas. Decreases in the ozone level of up to 10% have been reported in New Zealand in the month following the break-up of the Antarctic ozone hole The Antarctic ozone hole is an area of the Antarctic stratosphere in which the recent (since about 1975) ozone levels have dropped to as low as 33% Because of the extreme cold of the South Polar region, which is much colder than even the North Pole, an unusual kind of cloud forms in the stratosphere over Antarctica. These clouds are called polar stratospheric clouds (PSCs), they are made of a mixture of water ice crystals, crystals of water ice mixed with nitric acid, as well as liquid water mixed with nitric acid and sulfuric acid.
Ozone is present in the stratosphere.  The stratosphere reaches 30 miles above the Earth, and at the very top it contains ozone Ozone is a bluish gas that is formed by three atoms of
oxygen.  The form of oxygen that humans breathe in consists of two oxygen atoms, O2.  When found on the surface of the planet, ozone is considered a dangerous pollutant and can be responsible for producing the greenhouse effect. One atom of chlorine can destroy more than a hundred thousand ozone molecules, according to the the U.S. Environmental Protection Agency. Why we should be concerned The depletion of the Ozone lets more and more UV-B rays pass through the atmosphere and reach earths surface. UV-B
radiation causes skin cancer, cataracts and immune suppression in both animals and humans. Most infectious diseases
are transmitted by insects and rodents. Transmitters of disease are called vectors. For example, mosquitoes transmit malaria, dengue and a virus that causes inflammation of the brain. Like other animals and plants, vectors are used to certain climate conditions. If the climate becomes warmer, the mosquito will try to fly to new places where it can survive and more people will be exposed to the diseases that it carries. How is the ozone depletion?
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