Chemistry Of The Stratosphere:
here are several techniques used to investigate the chemistry of the
stratosphere. The first of these is monitoring which involves
analysing the air using spectroscopy. Given that ozone absorbs in the
infra-red and ultra-violet regions of the spectrum, the concentration
on ozone in a sample can be calculated form the strength of its
absorption (figure1). This has to be carried out at different times
and in different conditions to ensure any decrease is not due to
natural fluctuations.
[IMAGE]
Figure 1 - Ozone Distribution in the Atmosphere
Once the molecules present in the stratosphere are identified,
laboratory measurements can be carried out to investigate the
reactivity of the molecules concerned and how radiation affects them.
Special techniques such as flash photolysis have to be used to work
out how fast the reactions are occurring. This technique allowed
scientists to work out that the reactions breaking down and making
ozone are generally occurring at the......
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