15-AtmosphericCorrection

15-AtmosphericCorrection - ESM 266: Atmospheric Correction...

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1 ESM 266: Atmospheric  ESM 266: Atmospheric  Correction Correction Jeff Dozier
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2 Atmospheric absorption Atmospheric absorption and scattering and scattering absorption scattering emission
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The idea of  The idea of  radiative transfer radiative transfer Really difficult, but also well studied Think of the problem in 2 parts Single scattering – what happens when radiation (light) encounters a scattering element Gas molecule, aerosol (dust or salt), or cloud droplet Scattering : no absorption of energy, light goes off in different direction Absorption : radiation converted to increase in temperature Multiple scattering – the atmosphere is a layered collection of scattering and absorbing molecules and particles 3
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4 Wavelengths of radiation and the atmosphere Wavelengths of radiation and the atmosphere Ultraviolet (<0.4 μ m): absorbed by stratospheric ozone (less ozone more UV) Visible (0.4–0.7 m): scattered by air molecules, dust, soot, salt, clouds Scattering by air greater for shorter wavelengths (blue). Near-infrared (0.7-3.0 m) (from Sun): scattered less, but absorbed by water vapor, especially at 1.4 and 1.9 μ m, and by clouds Middle infrared (3-5 m) (from Sun and Earth) and thermal infrared (>5 m) (from Earth): absorbed by clouds, water vapor, carbon dioxide, methane, ozone, and other “greenhouse” gases Some “windows” (3.5-4.0 μ m and 10.5-12.5 μ m) when no clouds
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Spectral solar irradiance Spectral solar irradiance 5
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Single scattering (Mie theory – from G. Mie, 1908)
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This note was uploaded on 08/06/2008 for the course ESM 266 taught by Professor Dozier during the Spring '08 term at UCSB.

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15-AtmosphericCorrection - ESM 266: Atmospheric Correction...

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