This chapter has described the data and products of the USDA UVMRP. These datasets are available to the public and can be accessed via the Internet. The monitoring network consists of 37 observation sites covering the continental U.S., along with coverage of Alaska and Hawaii, southern Canada, and southern New Zealand. Multifilter Shadowband Rotating radiometers are deployed to make spectral irradiance measurements in the UV and visible wavelength regions. The erythemally weighted UV radiation is measured by broadband pyranometers. The PAR is also measured for use in agricultural research. The program has been providing quality UV-B radiation data to researchers throughout the agricultural, medical, industrial, and atmospheric research communities since 1993. The primary

Figure 8.13 Comparison of the UV index from USDA UVMRP (top) averaged over the summers of 2000 - 2004 and the same quantity from NASA TOMS (bottom) as reported in Gao et al. (2009). The UVMRP UV indices span from 5.4 to 9.0 while the TOMS values range from 5.6 to 12.0

raw voltage measurements are available by special request. With our research in instrumentation, correction techniques, system stability, and statistical analysis, high quality calibrated data have been produced as second level products. These data furnish researchers in agriculture, ecology, environment, meteorology, human health, and related specialties with valuable information not available elsewhere. Based on our research results, optical depths, daily column ozone, and synthetic spectra are derived using spectral UV-B measurements, plus spectral irradiances in the visible region. The USDA UVMRP receives numerous requests for its products from researchers in agriculture, atmospheric monitoring, human and animal health, and industrial product quality concerns. The UVMRP is collaborating with the broader scientific community, with an eye toward the future, to focus its activities and resources to best serve the needs of researchers across a wide spectrum of scientific and social activities.

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