... stratosphere and the how the gases mix up. Distances are vast in the stratosphere and the mixing between the vertical layers is slow, whereas air circulating around latitude lines, help gasses to mix within a layer. The information collected by the sources mentioned above is used to create models and therefore make predictions. Evidence that led scientists to link ozone depletion with the use of CFCs In 1972, a method of detecting the CFCs in the troposphere was developed. A gas chromatograph was used to split the air into different components. This was coupled to an electron-capture detector which was sensitive to the halogen compounds. Small concentrations of CCl3F in rural areas were detected, which was able to diffuse intact to Antarctica. It was thought that a CFC molecule would get involved in the following reaction. The Cl radicals could destroy the ozone in the reaction shown in the ...

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