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| q |
Ozone Production
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UV photons are required
for ozone production:
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O2 +
UV photon à O + O
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Below about
20 km, UV photons are absorbed by ozone. Therefore, O2 can be
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photolyzed only above 20 km. This is why the ozone layer
is located in the
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stratosphere and not near Earth’s surface.
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| q |
Ozone Destruction
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O3 can be split by
radiation in the visible-light range:
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O3 +
photon à O2 + O
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Because
many more visible photons than UV photons are available, O3 is
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photolyzed (ozone destruction) much faster than O2
(ozone production).
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Also, O3
can be photolyzed all the way sown to Earth’s surface.
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