Depletion Of The Ozone Layer :: essays research papers

The ozone shape diminishes more each year. As the ara of polar ozone depletion (commonly called the ozone hole) gets larger, extra ultraviolet rays are allowed to pass through and through. These rays cause cancer, catar operations, and lowered immunity to diseases.1 What causes the depletion of the ozone layer?     In 1970, Crutzen first showed that nitrogen oxides produced by decaying nitrous oxide from soil-borne microbes react catalytically with ozone hastening its depletion. His findings started research on "global biogeochemical cycles" as well as the effectuate of supersonic transport aircraft that release nitrogen oxide into the stratosphere.2      In 1974, Molina and Rowland be that human-made chlorofluorocarbons apply for making foam, cleaning fluids, refrigerants, and repellents transform into ozone-depleting agents.3     Chlorofluorocarbons stay in the atmosphere for some(prenominal) decades due to their long tropospheric lifetimes. These compounds are carried into the stratosphere where they undergo hundreds of catalytic cycles with ozone.4 They are gloomy down into centiliter atoms by ultraviolet radiation.5 Chlorine acts as the throttle for breaking down atomic group O and molecular(a) ozone into two molecules of molecular oxygen. The basic set of reactions that involve this process are                    Cl + O3 -->ClO + O2 and                    ClO + O -->Cl + O2     The net result                    O3 + O -->2O2     Chlorine is initially outside in the first equation by the reaction with ozone to form centilitre monoxide. Then it is regenerated through the reaction with monatomic oxygen in the atomic number 42 equation. The net result of the two reactions is the depletion of ozone and atomic oxygen.6Chlorofluorocarbons (CFCs), halons, and methyl bromide are a few of the ozone depletion substances (ODS) that break down ozone under intense ultraviolet light. The bromine and fluorine in these chemicals act as catalysts, reforming ozone (O3) molecules and monatomic oxygen into molecular oxygen (O2).In volcanic eruptions, the sulfate aerosols released are a natural cause of ozone depletion. The hydrolysis of N2O5 on sulfate aerosols, coupled with the reaction with chlorine in HCl, ClO, ClONO2 and bromine compounds, 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 due to volcanic eruptions. Analysis of the El Chichon volcanic eruption in 1983 found ozone destruction in areas of higher aerosol c oncentration (Hofmann and Solomon, "Ozone Destruction through Heterogeneous Chemistry Following the Eruption of El Chichon"). They deduced that the "aerosol particles act as a base for multiphase reactions leading