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> Ozone is a minor constituent of atmosphere and small amounts can be
> found from anywhere (at least almost anywhere). Ozone is mainly formed
> in the upper parts of stratosphere (within the ozone layer) by
> photochemical reactions and near the ground (air pollution and
> photochemistry). Due to mean flow and turbulent mixing in the
> atmosphere, ozone is then moved all around.
Ozone is _present_ mostly in the upper parts of the stratosphere, but
it's actually mainly _formed_ still higher, in the mesosphere and
lower thermosphere. However ozone at these altitude is more rapidly
destroyed by solar UV radiation, while ozone in the stratosphere is
more protected against solar UV and therefore will survive longer.
This is why the largest amounts of ozone are found at lower altitudes
than where the ozone production is fastest.
Paul Schlyter, Swedish Amateur Astronomer's Society (SAAF)
Grev Turegatan 40, S-114 38 Stockholm, SWEDEN
e-mail: pausch_at_saaf.se psr_at_home.ausys.se
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