EES 108 Class 04

EES 108 Class 04 - LightintheAtmosphere EES108 Class#4...

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Light in the Atmosphere EES 108 Class #4 Tuesday Sept 4, 2011 Notice: New assignment sheet is posted on OAK
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Outline Interactions of light and atmosphere: Scattering Three kinds Depends on size of particles,  wavelength of light Reflection/Albedo Absorption Depends on chemical composition,  wavelength of light Greenhouse effect Longwave vs. Shortwave
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Note on homework Lab 1 #7 Lapse rate in  troposphere: Positive Higher = cooler In stratosphere: Negative Higher = warmer Why?
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Ocean: water vs. ice
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Albedo Albedo: fraction of  sunlight reflected  back to space. The rest is absorbed  as heat Heating =   (Solar Constant) ×  (1 – Albedo)  × Area Earth’s average  albedo is 0.3: 
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Why the sky is blue
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Why sunrise/sunset is red
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Rayleigh scattering
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Three kinds of scattering Rayleigh: Particle much smaller than wavelength Shorter (blue) wavelengths scattered more Scattering in all directions Mie: Particle size similar to wavelength All wavelengths scattered equally Scattering mostly in forward direction Nonselective Particle much larger than wavelength All wavelengths scattered equally Scattering in all directions
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Three kinds of scattering Rayleigh: Air molecules ~ 1/10,000 wavelength Blue sky Mie: Smoke, fine dust ~ ¼ to 4 wavelengths or so Haze Nonselective Water droplets ~ 20-200 wavelengths Clouds
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EES 108 Class 04 - LightintheAtmosphere EES108 Class#4...

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