GEOB 200 Lecture Notes - Lecture 5: Radiant Flux, Emissivity, Longwave

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Surface properties controlling incident radiation --> controls the radiation coming in. Absorptivity: absorption by surfaces and small objects in the atmosphere (e. g. bits of dust), fraction of incident radiation absorbed. Transmissivity: fraction transmitted through the surface to a medium beneath it (e. g. solar radiation penetrating into clear, deep waters) The subscript indicates that these properties change with wavelength (as we will see) Conservation of radiant energy --> the 3 properties determine the fate of the incident radiation on the surface. All of the surface properties add up to 1. Surface albedo: the amount of radiation that is reflected from a surface. Emissivity: the surface is also able to emit radiation with it"s own temperature and it"s other surface property (in stefan-boltzmann law) Cosine law of radiation: describes how the incident radiant flux density (irradiance) of a beam decreases as the beam"s angle varies from overhead (normal) to a more slanted path relative to the surface.

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