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Test 2 Notes

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Louisiana State University
GEOG 2050

GEOG 2050 test 2 notesFebruary 13Transmission scattering diffusion refraction mirage reflection albedo absorption Rayleigh scatteringChapter 4 Atmosphere and Surface Energy Balances1Earths Energy BudgetaSolar radiation variesiOutput from suniiDistance of Earth from SuniiiDailyivSeasonallyvLatitudesbAtmosphere functions as a filteriAbsorbs1Gamma rays2Xrays3UV raysiiAllows visible to reach Earths surface2Energy pathwaysfigure 41aShortwave energy from the sunsuns hotter high energyiSome gets reflected to spaceiiSome encounters clouds and gases in the atmospherediffuse energyiiiDirect energyunencumbered as it moves through the atmospherebLong wave energy from the earthEarth has a lower temperature than the sun lower energy3TransmissionaPassage of energy through atmosphere or water4Insolation at Earths SurfaceaInsolation inputall radiation received at Earths surfacedirect and indirectbFigure 42iredorange colors mean a lot of energy is coming in maximums in western US Australia Northern and Southern Africa middle of South AmericaJUST OUTSIDE THE TROPICSii Bluegreen means less energy is coming insome is near the tropics Means were losing energy near there5Energy PathwaysaInsolation in the atmosphere encounters gases dust clouds and smokeb50 of insolation makes it to the Earths surfacecThese particles caniScatter1Changing direction of lights movement WITHOUT altering its wavelengthiiAbsorb1The assimilation of radiation by molecules of matter The CONVERSION OF ENERGY from one form to another Heats the Earths atmosphereiiiReflect1Insolation light is bounced off a surface WITHOUT being absorbed or scatteredivRefract1CHANGE in speed and directions of light6SCATTERINGaOccurs when insolation is not absorbed but is bounced in all directionsbScatter agentsiDust pillutants ice cloud droplets and water vaporcDiffuse radiationthe downward component of scattered lightmultidirectional shadowless lightdRayleigh ScatteringiShorter wavelengthsgreater scattering violet to blue smaller moleculesiiLonger wavelengthsless scattering orange to red larger moleculesiiiWhy is the sky blue at noon and red at dusk or dawn WILL BE ON TEST1At noon blue light shorter wavelengths most readily scattered Thats what you see2At low sun angles blue light is so scattered that it is eventually absorbed and only scattering of red light is visible7ABSORPTIONlook at figure 37 againaThe retention of radiant energy by atmospheric gases dust clouds smokebConverted into long wave or chemical energycAbsorption raises temperature of molecules eg in thermosphere and stratosphereiEX Ozone layer in Stratosphere absorbs UVtemperature is higher in the stratosphere
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