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Unformatted text preview: 5/28/2008 ESM 266: Atmospheric correction 1 ESM 266: ESM 266: Atmospheric Atmospheric Correction Correction 1 Jeff Dozier Atmospheric absorption Atmospheric absorption and scattering and scattering emission 2 absorption scattering The idea of The idea of radiative radiative transfer 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 Wavelengths of radiation and the atmosphere Wavelengths of radiation and the atmosphere Ultraviolet (<0.4 m): absorbed by stratospheric ozone (less ozone more UV) Visible (0.40.7 m): scattered by air molecules, dust, soot, salt, clouds Scattering by air greater for shorter wavelengths (blue). 4 Near-infrared (0.7-3.0 m) (from Sun): scattered less, but absorbed by water vapor, especially at 1.4 and 1.9 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 m and 10.5-12.5 m) when no clouds Spectral solar irradiance Spectral solar irradiance 5 Single scattering (Mie theory Single scattering (Mie theory from G. Mie, 1908)Single scattering (Mie theory from G....
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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.
- Spring '08