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Light - Lecture 4B Light in Lakes Freshwater Ecosystems...

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Lecture 4B – Light in Lakes Freshwater Ecosystems EVPP/BIOL 350 Dr. Kim de Mutsert Fall 2011
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Light in Lakes Sun is virtually the only source of energy in natural aquatic habitat; it fuels photo- synthesis and heats water Solar constant Rate at which radiation arrives at edge of Earth’s atmosphere ≈ 2 cal/cm 2 /min More than half of this is lost coming through the atmosphere
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Disposition of solar radiation reaching Earth’s atmosphere
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Light in the Atmosphere Absorption by different chemicals in atmosphere Water and ozone (O 3 ) are especially important Ozone is the most important in the UV range
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Light Light may be considered to be made up as particles called photons Energy (E) content of a photon is related to its frequency Higher frequency ( shorter wavelength) radiation has more energy per photon Light is often quantified as photon flux density Number of photons crossing a unit of surface area per unit time Moles/m 2 /sec; 1 mole of photons = 1 Einstein Our light meter measures in µE
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