Rd. Bojkov et al., THE RELATIONSHIP BETWEEN SOLAR UV IRRADIANCE AND TOTAL OZONE FROM OBSERVATIONS OVER SOUTHERN ARGENTINA, Geophysical research letters, 22(10), 1995, pp. 1249-1252
Solar ultraviolet (UV) radiation at 300 and 305 nm, measured by a Bios
pherical Instruments high resolution scanning spectroradiometer at Ush
uaia, southern Argentina (55 degrees S, 68 degrees W), as a part of th
e US National Science Foundation Network for Polar Regions, was compar
ed with total ozone satellite measurements. A statistical relationship
between UV and total ozone was derived. On the basis of this relation
ship, the differences in 300 and 305 nm irradiance between 1979-1983 a
nd 1989-1993 intervals are estimated; for October, the 15% observed de
cline of total ozone has led to irradiance increases of 80% at 300 nm
and 35% at 305 nm. During the days with ''ozone hole'' conditions, the
300 nm irradiance is as high as it would be at the summer solstice th
ree months later, and is similar to 4 times higher than the UV irradia
nce corresponding to the ''normal'' ozone condition for early October,
as further illustrated for October 1994. Inclusion of the 340 nm clou
dy-dependent predictor is discussed.