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Ozone deficiences during 1963-1998 as measured at Belsk, Poland
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In the past two decades significant decreases in the ozone layer have been observed. The greatest ozone losses have occurred at the high and middle latitudes during the winter and spring seasons. The global average ozone decline in 1979-1997 was estimated as about 506% during the winter and spring about 3% during the summer and autumn at extratropical regions of the northern hemisphere and about 5% over the southern hemisphere. An acceleration of the rate of ozone decline has been observed during the last decade not only in winter-spring but also during the summer months. Under cloudless skies, the UV solar radiation is much more intense in the summer months than during other seasons. Thus, the increasing ozone losses are then of special importance because of the potentially excessive solar UV radiation flux. Confirming evidences of ozone changes were provided by analysis of systematic ground-based and satellite measurements at the stations of the World Meteorological Organization (WMO) Global Ozone Observing System (GO3OS). The measurements of total amount of ozone and its vertical distribution have been performed by means of the Dobson spectrophotometer at Belsk Observatory (Poland) since 1963. Total (columnar) ozone is an important quantity controlling the strength of UV solar radiation which reaches the earth surface; it is measured as a thickness of ozone atmospheric layer at standard pressure and temperature. Ozone deficiencies at northern midlatitudes were considered basing on the data from the Belsk station. The total ozone values for the period 19963-1997 were analysed with a special attention paid to the summer seasonal means. It was, for example, shown that differences between winter-spring mean ozone value and those of summer season distinctly decreased in the period 1964-1997 (about 3% per decade). The record low daily ozone value on 1 January 1998 over Belsk, associated with the passage of an ozone 'mini-hole' across Europe from 30 December 1997 through 2 January 1998, was demonstrated. The total ozone trends at Belsk during 1970-1997 were compared with those in 1980-1997. As for other stations of northern midlatitudes, at Belsk an acceleration of the season), especially in the winter-spring season. The ozone vertical profile trends, derived from the Belsk measurements obtained by means of Umkehr method, were established using the multiple regression model for the period 1980-1997. The trends were negative (and statistically significant at the 1 level) at all altitudes; the downward trend was largest (about - 6% per decade) between 0-28 km in spring. (...) There are serious implications of the depleted atmospheric ozone layer. Increasing penetration of ultraviolet solar radiation to the Earth's surface poses a potential threat to the global ecosystem.
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Tom
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257--268
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wykr., bibliogr. 16 poz.
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Bibliografia
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bwmeta1.element.baztech-article-BUS1-0005-0076
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