Monthly mean total ozone data from Syowa (69°S, 40°E), Antarctica, for 1961‐1985 show ozone to have been decreasing in October months, particularly after about 1980. Data For 1974‐1985 exhibit total ozone decrease during September throughout March months, with particularly large decrease occurring October and November months. (Observation were not made during April through August months.)
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Chubachi et al. (1986) studied this question.
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