3.) OZONE 1930 average. b) shows total column ozone a) shows global ozone change
ID: 299482 • Letter: 3
Question
3.) OZONE 1930 average. b) shows total column ozone a) shows global ozone change compared to at the South Pole in 2010 and 2011 compared to the 1986-2009 average. Global Total Ozone Changes Changes from 1964-1980 average SOUTH POLE a) b) 2010 2011 Annual averages 1970 1980 1990 2000 2010 Year a) What role did chlorofluorocarbons Erens) play in determining the shape of the graph on the left (a)? Specifically, why did Total Global Ozone start decreasing around 1980? Why did it level off in the early 1990s? (4 points) b.) Why did the total column ozone drop significantly in September and October of 2010 and 2011? Explain the processes that destroy ozone during Antarctic spring. (4 points) b) Whyis there a nomally a maximum in ozone concentration (partial pressure) at around 15- 20 km altitude (blue line)? In other words, what processes create ozone in the stratosphere? (2 points)Explanation / Answer
ANSWER-
1. Chloroflourocarbons are to be blamed for global warming since the 1970s and not carbon dioxide .According to research,it is striking to know that there was global warming by about 60c from 1950 to 2000 but the earth has gradually cooled since 2002 .The cooling trend is ready to continue for the next 50-70 years as the amount of CFCs in the atmosphere continues to decline.
leveling off sicne 1990s may be due to steps taken to protect the ozone layer in the stratosphere like for eg. the montreal protocol whereby now the ozone layer is slowly but progressively healing.The Antartica ozone hole has continued to appear each spring ,as it has since the late 1970s.As a result of control by the Montreal protocol concentration of these human made substances over Antartica have fallen by 14% since their peaks in 2000.
2.main factors producing the ozone hole are the extreme cold temperatures during the spring and the release of human based release of CFCs. below -800c in the spring the chemicals present in the stratosphere freeze out and form polar stratopheric clouds.these chemical reaction cause the large decrease in ozone during each austral spring over Antarctica.
3.the formation of ozone layer takes place in the upper stratosphere when an oxygen molecule is broken into two atoms by ultraviolet radiation and the free unstable atoms combine with two other oxygen molecules.This results in the formation of two molecules of ozone which comprise three oxygen atoms each.
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