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

Jeffrey Hicke; James R. Slusser; Kathleen Lantz

doi:10.1117/12.560092

14 October 2004 Long-term variability in surface UV-B radiation across the United States

Jeffrey Hicke, James R. Slusser, Kathleen Lantz

Proceedings Volume 5545, Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV; (2004) https://doi.org/10.1117/12.560092
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

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.

Citation Download Citation

Jeffrey Hicke, James R. Slusser, and Kathleen Lantz "Long-term variability in surface UV-B radiation across the United States", Proc. SPIE 5545, Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV, (14 October 2004); https://doi.org/10.1117/12.560092

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