Ozone - Damaging the Ozone Layer Composition of Air...

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Damaging the Ozone Layer
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Composition of Air
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Structure of Present-Day Ozone Layer 90% of O 3 molecules reside in stratosphere
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Ozone Formation, Noncatalytic Destruction, and the Chapman Cycle
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Catalytic Processes of Ozone Destruction: Mostly Natural Contributors to X in non-polluted stratosphere NOx Catalytic ozone destruction cycle NO . Responsible for shaping the ozone profile in the middle and upper stratosphere. HOx Catalytic ozone destruction cycle HO . Dominant role in ozone destruction at high stratospheric altitudes. Together with HOO . , responsible for shaping the ozone profile in the lower stratosphere.
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Atomic Chlorine and Bromine as X Catalysts • Cl . and Br . : efficient in destroying O 3 • Natural sources (CH 3 Cl, CH 3 Br) Anthropogenic sources (CFCs, HCFCs, halons)
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Anthropogenic sources (CFCs, HCFCs, halons) There is no tropospheric sink. They have very long lifetimes (> 100 years). After a few years traveling in the troposphere, they diffuse into the stratosphere, where eventually they undergo photochemical decomposition (UV-C), liberating halogen atoms. Molina and Rowland (1974) first recognized that
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Ozone - Damaging the Ozone Layer Composition of Air...

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