Preface to Section II — The Hydrosphere
A column of water of variable thickness is interposed between the solar UV reaching the water surface and the aquatic organisms. While the nature of the chemical and the optical events occurring in the suspending water are known to be just as complex and controversial as the ways in which the atmosphere modifies solar UV radiation, it would appear that for ecological purposes the optical oceanographers need to answer only one encompassing question: How much solar UV reaches organisms at various depths in natural waters? In more rigorous terms: What are the attenuation coefficients of natural waters?
KeywordsNatural Water Attenuation Coefficient Yellow Substance Solar Ultraviolet Radiation Secchi Disc Transparency
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