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Chapter 3

Chapter 3.docx

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Environmental Science
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Sean Mc Master

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Chapter 3Atmospheric Infleunces on Insolation process absorption scattering and transmission of solar radiationAbsorption atmospheric gases particulates and droplets all reduce the intensity of insulationhas 2 effects o the absorber gains energyo warms while the amount of energy delivered to earths surface is reducedSolar radiation is the atmospheres heat source Most gases are transparent to solar radiationthey do absorb terrestrial radiationGasess also scatter energy The global energy budget a balance between incoming solar radiation and outgoing terrestrial radiationAtmospheric Influences on Insolation Radiant energy is absorbed reflected or transmitted scatteredAbsorption particular gases liquids and solids absorb energy o Heat increases o Gases are poor selective absorbers of energyReflection o Redirection of energy o Does not increase heat o Albedo percentage of reflected energyScattering o Scattered energy diffuses radiation o Reduces intensityo Type determine by size of scattering agentsDiffuse Light o The solar radiation that has been scattered by tiny atmospheric particles o Scattered light travels equally in all directions diffuseRayleigh Scattering o Molecules that have a small diameter relative to the wavelength of interaction short wave will effectively scatter the incident radiation o The atmosphere appears blue because the shorter wavelength of the visible spectrum are scattered o A red sky at sunrise and sunset occurs because nearly all the short wavelengths are scattered o Photographers often use a filter to eliminate the short wavelengths that give pictures a haze diffuse light appearanceMie Scattering o Larger scattering agesnts aerosols interact with wavelength across visible spectriumo Hazy greyish skies o Sunrisesunset color enhancementNonselective Scatteringo Very large scattering agents water o Scatter across the visible spectrum o White or gray appearance o No wavelength especially affectedThe atmospheric Greenhouse effect o Attenuation of infrared radiation emission between the earths surface and space by atmospheric constituents
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