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1 December 2001 Interannual Variability in Solar Ultraviolet Irradiance over Decadal Time Scales at Latitude 55° South
John E. Frederick, Virginia W. Manner, C. Rocky Booth
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Ground-based measurements of solar UV spectral irradiance made from Ushuaia, Argentina at latitude 55°S reveal a large degree of variability among corresponding months of different years over the period from September 1990 through April 1998. The magnitude and wavelength dependence of year-to-year changes in monthly spectral UV-B irradiation are consistent with expectations based on the behavior of column ozone and cloudiness. When combined with satellite measurements of column ozone, a regression model fit to the ground-based data set allows estimates of monthly UV-B irradiation over a time frame of two decades, 1978–1998, during several months of the year. Results show a general increase in ground-level irradiation at 305.0 nm from the end of the 1970s to the early 1990s during calendar months from September through December. This is followed by generally smaller irradiances through the middle to late 1990s for all months except November, where the increase continues through the end of the data record. The long-term variability in monthly irradiation over the time period studied is more complicated than can be described by a simple linear trend.

John E. Frederick, Virginia W. Manner, and C. Rocky Booth "Interannual Variability in Solar Ultraviolet Irradiance over Decadal Time Scales at Latitude 55° South," Photochemistry and Photobiology 74(6), 771-779, (1 December 2001).<0771:IVISUI>2.0.CO;2
Received: 12 January 2001; Accepted: 1 September 2001; Published: 1 December 2001

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