Depletion of the Ozone Layer

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 Essay about Depletion of the Ozone Level

The ozone part diminishes even more each year. While the area of

extremely ozone exhaustion (commonly named the ozone hole) gets larger, further ultraviolet sun rays are allowed to pass through. These sun rays cause cancer, cataracts, and lowered immunity to diseases. 1 What can cause the destruction of the ozone layer?

In the 1970s, Crutzen came out that nitrogen oxides produced by decaying nitrous oxide from soil-borne microbes behave

catalytically with ozone hastening the depletion. His findings began research in " global biogeochemical cycles" as well as the effects of supersonic transportation aircraft that release nitrogen oxide in to the stratosphere. a couple of

In 1974, Molina and Rowland found that human-made

chlorofluorocarbons used for making foam, cleaning liquids,

chemicals, and repellents transform into ozone-depleting providers. 3

Chlorofluorocarbons remain in the ambiance for several decades due to their very long tropospheric lives. These ingredients are taken into the stratosphere where they undergo hundreds of catalytic periods with ozone. 4 They can be broken down in to chlorine atoms by ultraviolet radiation. 5 Chlorine will act as the catalyst for deteriorating atomic air and molecular ozone into two elements of molecular oxygen. The fundamental set of reactions that involve this process happen to be:

Cl + O3 --> ClO + O2 and

ClO + O --> Cl & O2

The net result:

O3 + To --> 2O2

Chlorine is definitely initially taken off in the first equation by the reaction with ozone to create chlorine monoxide. Then it can be

regenerated through the reaction with monatomic oxygen inside the second formula. The net reaction to the two reactions is the exhaustion of ozone and atomic oxygen. 6

Chlorofluorocarbons (CFCs), halons, and methyl bromide are a few of the ozone depletion substances (ODS) that break down ozone under strong ultraviolet lumination. The bromine and fluorine in these chemical compounds act as catalysts, reforming ozone (O3) molecules and etherium oxygen in to molecular oxygen (O2).

In scenic eruptions, the sulfate aerosols released can be a natural source of ozone destruction. The hydrolysis of N2O5 on sulfate aerosols, coupled with the reaction with chlorine in HCl, ClO, ClONO2 and bromine ingredients, causes the breakdown of ozone. The sulfate aerosols cause chemical reactions in addition to chlorine and bromine reactions on stratospheric clouds that destroy the ozone. 8

Some ozone depletion is a result of volcanic lesions. Analysis in the El Chichon volcanic eruption in 1983 found ozone

devastation in parts of higher pulverizador concentration (Hofmann and Solomon, " Ozone Destruction through Heterogeneous Hormone balance Following the Eruption of El Chichon" ). They deduced that the " aerosol allergens act as a base for multiphase reactions resulting in ozone reduction. " being unfaithful Chlorine and bromine cooperates with

stratospheric contaminants such as ice, nitrate, and sulfate to speed the response. Sulfuric acid solution produced by eruptions enhances the self destruction of the chlorine chemicals that attack ozone. Volcanically perturbed conditions maximize chlorine's break down of ozone. Also, chlorine and bromine react well under frosty

temps 15-20 miles up in the stratosphere in which mos

of the ozone can be lost. This can help explain how come there is much less ozone inside the Antarctic and Arctic extremely regions. 10, 11

The Antarctic ozone hole may be the largest. A 1985 examine

reported the loss of a lot of ozone over Halley Bay, Antarctica. The thought cause was the catalytic cycles

regarding chlorine and nitrogen. doze

Halons, an especially potent source of ozone depleting

molecules, are used in fire extinguishers, refrigerants, chemical substance processing. They are really composed of bromine, chlorine, and carbon. The majority of the bromine inside the atmosphere formerly came from

halons. Bromine is predicted to be 40 times more efficient than chlorine in destroying ozone. 13

Insect fumigation, using biomass,...

Sources: 1 . Monastersky, R. (1992, September 19). UV hazard: Ozone

lost compared to ozone obtained

2 . Lipkin, R. (1995, October 21). Ozone Exhaustion research

wins Nobel

Network(CIESIN) (1996, June, Variation: 1 . 7). Chlorofluorocarbons

and Ozone Depletion

five. CIESIN (1996, June, Edition: 1 . 7). Production and Use of


6th. CIESIN (1996, June, Type: 1 . 7). Ozone Exhaustion


7. US Environmental Protection Agency (1996). Ozone

Depletion Glossary

8. Countrywide Oceanic and Atmospheric Supervision (1994).

Scientific Evaluation of Ozone Depletion-Executive Brief summary

9. CIESIN (1996, 06, Version 1 ) 7). Ozone Depletion


twelve. National Oceanic and Atmospheric Administration (1994).

Clinical Assessment of Ozone Depletion-Executive Summary

13. Adler, T. (1995, October, 28). Methyl Bromide doesn 't

stick around

12-15. National Oceanic and Atmospheric Administration (1994).

Technological Assessment of Ozone: 1994-Executive Summary

sixteen. CIESIN (1996, June, Type: 1 . 7). Ozone Destruction


17. CIESIN (1996, 06, Version: 1 . 7). Ozone Depletion


18. Monastersky, Ur. (1995, October 14). Ozone hole reemerges

over Atlantic