Abstract
RECENT theories of the atmospheric circulation ascribe the well-known mid-latitude spring increase in total ozone to the release into the lower stratosphere, during the breakdown of the circumpolar westerlies, of ozone which has been carried to the winter pole by air movements and stored there1–6. The details of this process of accumulation remain speculative, however, until many more ozone observations in the polar night become available on a routine basis. The internationally accepted standard ozone instrument, the Dobson spectrophotometer, normally uses sunlight; useful results can be obtained on the full moon7,8, but this demands an increase in observing skill as well as imposing a serious limitation on continuity.
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