chapters 4 5 6 7 notes GEOG 2050

chapters 4 5 6 7 notes GEOG 2050 - Geography2050Test2...

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Geography 2050 Test 2 24/05/2011 14:00:00 Chapters: 4, 5, 6 and 7 Chapter 4 and 5-Energy Balance and Temperature: Solar radiation     - primary heat source for atmosphere. The Balance between…      Incoming solar radiation (insulation)      Absorption of terrestrial radiation by atmospheric radiation.      Release of terrestrial radiation into space. … Describes the global energy budget. Atmospheric Influences on Insulation:     Solar energy interacts with atmospheric gases and/or Earth’s surface.          Absorbed, reflected/scattered, or transmitted     Only absorbed energy leads to direct heating. Absorption-       Particular gases/liquids/solids in atmosphere absorb energy.
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     Heat increases in absorber-less energy at surface.      Overall, atmospheric gases=relatively poor absorbers. Reflection/Scattering-      Energy redirected (energy is being bounced into a different direction)      No heat increase in object      Usually only a portion of energy reflected             Albedo- percentage of reflected energy Energy can be reflected:      In an equally intense beam- specular reflection             (Looking in the mirror- equal reflection)      Into many weaker wavelengths-diffuse reflection or scattering Insulation- (incoming)      Absorption- most gases are poor absorbers      Deflection/scattering- most gases are good absorbers Scattering-      Most atmospheric gases effectively scatter radiation.           Thus, energy reaching surface usually diffuses.
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     Characteristics of scattering depend upon size of scattering agents.          3 Types of Scattering:         -Rayleigh         - Mie         - Non-selective Rayleigh Scattering-        Involves gases/agents smaller than energy wavelengths. (Results in why the sky is  blue)       Scatters energy everywhere and in every direction       Occurs more readily with shorter wavelength energy       Dominant in upper atmosphere Mie Scattering-      Larger scattering agents (e.g. aerosols) or weaker vapor molecules      About same size as radiation wavelengths; interacts across visible      Scatters forward only           (Get hazy sites, like big cities-LA, NYC, etc…)      Dominant in lower atmosphere Non-selective Scattering-
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     Particles larger than energy wavelengths (e.g. raindrops)      All visible wavelengths scattered equally      Produces white or gray appearance (clouds) Transmission-     Percentage of energy transmitted through atmosphere to surface after  absorption/reflection/scattering
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This note was uploaded on 10/11/2011 for the course PSYC, PSYC 2076, 2060 taught by Professor Briganti,gustan,perlis,namikas,wheeler during the Spring '10 term at LSU.

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chapters 4 5 6 7 notes GEOG 2050 - Geography2050Test2...

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