Stratospheric Ozone Depletion
Stratospheric Ozone Depletion
Stratospheric Ozone Depletion
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Summary on ozone hole<br />
• Massive ozone loss requires both very cold temperature<br />
(to form PSCs) and sunlight (to photolyze reactive<br />
chlorine to produce Cl atoms).<br />
• Denitrification is required to prevent reformation of<br />
reservoir species once photolysis ensures.<br />
• Denitrification occurs when PSCs containing HNO 3<br />
settling out of the stratosphere.<br />
• The massive springtime loss of ozone in the Antarctic<br />
stratosphere (the <strong>Ozone</strong> hole) is conclusively linked to<br />
anthropogenic halogens.<br />
• Virtually all inorganic chlorine is converted into active<br />
chlorine every winter in both the Antarctic and Arctic<br />
stratosphere as a result of heterogeneous reactions of<br />
reservoir species on polar stratospheric clouds (PSCs).