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Proceedings Paper

Long-term variability in surface UV-B radiation across the United States
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Paper Abstract

The USDA UV-B Monitoring and Research Program maintains a network of Yankee Environmental Systems surface UVB meter instruments at stations throughout the United States. We analyzed the temporal behavior of UV-B at eight stations that were selected because of their early deployment (years beginning in 1995-1997 and ending in 2003). Though calibration methodologies differed before and after 1998, we accounted for variations among instruments and long-term drift in a consistent manner, and estimated a total calibration uncertainty of 7%. We computed mean annual and mean monthly irradiances for each month of the year for each station, and investigated temporal patterns. At Nunn, Colorado, mean annual UV-B irradiance increased by 3.4%, less than the calibration uncertainty. However, UV-B trends in five months exceeded the calibration uncertainty, with the maximum increase occurring in April (28%). Mean annual irradiances increased at all but one of the other seven sites, though only two exceeded the 7% uncertainty.

Paper Details

Date Published: 14 October 2004
PDF: 10 pages
Proc. SPIE 5545, Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV, (14 October 2004); doi: 10.1117/12.560092
Show Author Affiliations
Jeffrey Hicke, Colorado State Univ. (United States)
James R. Slusser, Colorado State Univ. (United States)
Kathleen Lantz, National Oceanic and Atmospheric Administration (United States)


Published in SPIE Proceedings Vol. 5545:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV
James R. Slusser; Jay R. Herman; Wei Gao; Germar Bernhard, Editor(s)

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