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By Christian E Junge

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By far the most important reaction which can occur under these conditions is thermal decay according to 0, + 0 , + 2 0 , + 0. This reaction is not only slow but also forms atomic oxygen again, which in turn forms new ozone. Hence, the decay of ozone in darkness is very slow and daily variations of total ozone due to radiation can hardly be expected. Little is known about the winter pole, but it is assumed that even there the ozone decrease is small. 42 1. 3 The Distribution of Total Ozone Total ozone is measured from the ground with special spectrometers developed by Dobson.

Therefore, it is questionable whether average eddy diffusion coe%cients and average profiles can be used to obtain the vertical ozone transport. A large number of measurements in ground air are available to study the behavior of tropospheric ozone in more detail and on a global scale. They show as a common phenomenon that the earth’s surface is a sink for ozone. I n stable air, with small eddy difhsion, ozone increases rapidly above ground indicating a downward flux. 5 meters above the Great Plains in Nebraska.

A possible reason for this discrepancy may be a more rapid exchange with the terrestrial biosphere. As of now the relation between the observed increase of CO, and the observed Suess effect is an open question and will perhaps remain so until more numerous and precise C14 measurements become available. On the other hand, the fair agreement between the observed increase of total atmospheric CO, and the fossil fuel consumption makes it unnecessary to invoke other CO, sources as suggested by previous authors.

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