Abstract: Methods to estimate the irradiance of ultraviolet-B (UVB; 280?320 nm) radiation are needed to assess biological effects of changes in atmospheric composition. Measurements of the spatial distribution of sky cloud cover, ...

Abstract: The estimation of photosynthetically active radiation across the earth's surface is needed to model plant productivity and future impacts of ultraviolet-B (UV-B) radiation on plant productivity. While radiation in the ...

Abstract: The particulate characteristics of the surface layer of the atmosphere over a region of southwest Indiana were determined for forty-two 24-hour periods between September 1985 and April 1986. The water-soluble sulfate, ...

Abstract: Sky radiance measurements in the wavelength bands of ultraviolet-B (0.28?0.32 ?m), ultraviolet-A (0.32?0.40 ?m), and photosynthetically active radiation (0.40?0.70 ?m) were made under obscured overcast skies in a rural ...