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

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Unformatted text preview: Lecture 4B – Light in Lakes Freshwater Ecosystems EVPP/BIOL 350 Dr. Kim de Mutsert Fall 2011 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 Disposition of solar radiation reaching Earth’s atmosphere 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 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 Light in Lakes...
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This note was uploaded on 01/23/2012 for the course BIOL/EVPP 350 taught by Professor Kimdemutsert during the Fall '11 term at George Mason.

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

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