The Amelioration of UV-B Effects on Productivity by Visible Radiation
Ultraviolet radiation is strongly absorbed by proteins and nucleic acids, and therefore has important photobiological consequences (Caldwell 1971; Klein 1978; NAS 1979). The principal attenuator of solar UV radiation passing through the earth’s atmosphere is a thin layer of stratospheric ozone, which effectively absorbs short wavelength UV and sets the lower wavelength limit reaching the earth’s surface at approximately 290 nm (Koller 1965). Therefore, the naturally occurring portion of the UV spectrum on the surface of the earth is in the UV-B (290–320 nm) and UV-A (320–380 nm) regions, and does not contain the highly actinic UV-C (200–290 nm) waveband. Although the middle portion of the UV spectrum accounts for only 3–5% of the total radiation penetrating the atmosphere, its energy level is sufficient to have a disproportionately large biological significance.
KeywordsStratospheric Ozone Longe Wavelength Radiation Active Photon Flux Stratospheric Ozone Concentration Lower Wavelength Limit
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