Global monitoring of atmospheric ozone and solar UV radiation
نویسنده
چکیده
The global monitoring network of ground-based ozone measurements consists mainly of Dobson and Brewer spectrophotometers. These instruments provide total ozone column amounts derived from measurements of direct solar UV radiation. Analysis of total ozone measurements from the global monitoring network shows a nearly linear downward trend from 1980 to mid 1990s. Data after mid 1990s indicate that global ozone is no longer decreasing. UV monitoring stations report erythemal UV irradiance levels in terms of UV indices. UV index levels up to 20 have been measured at high altitude stations located at low latitudes. Continuous reliable spectral UV measurements started in the late 1980ies, and, therefore, the existing time series for UV radiation are too short for estimations of global trends.
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