Stratospheric Ozone Depletion
Stratospheric Ozone Depletion
Stratospheric Ozone Depletion
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The two-sided effect of NOx<br />
• NOx provides a catalytic chain mechanism for<br />
O 3 destruction.<br />
• NOx inhibit the HOx and ClOx cycles for O 3<br />
destruction by removing radical species in the<br />
two cycles.<br />
• The relative magnitude of the two effects is<br />
altitude dependent.<br />
– >25 km, the net effect is to destruct O 3 .<br />
– (NOx accounts for >50% of total ozone destruction<br />
in the middle and upper troposphere.)<br />
– In the lower stratosphere, the net effect is to protect<br />
O 3 from destruction.
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