CH 3 The Electromagnetic Spectrum What wavelengths are
- Slides: 15
CH 3: The Electromagnetic Spectrum What wavelengths are associated with sunburns? What wavelengths ‘break’ NO 2? What types of transitions are important for UV, VIS, IR, Microwave? Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
CH 3: The Electromagnetic Spectrum Top of the Atmosphere Solar Radiation: Fits to a black body between 5500 K and 6000 K. Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
Top of the Atmosphere Solar Radiation: Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
SOLAR SPECTRUM: TOP OF THE ATMOSPHERE Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
SOLAR SPECTRUM: TOP OF THE ATMOSPHERE AND AT THE SURFACE Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
SOLAR SPECTRUM: Effects of Rayleigh (gas) scattering, O 2 and N 2. Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
SOLAR SPECTRUM: Effects of Rayleigh (gas) scattering, O 2 and N 2, And effects of extinction by aerosol particles. Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
SOLAR SPECTRUM: Effects of gaseous absorption. Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
Sun and Earth Spectra and Atmospheric Windows Sun Visible Window Earth IR Dirty Window Absorption only, not effects of Rayleigh Scattering by gases. Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
Rayleigh Scattering In Perspective Relative to Absorption Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
Absorption cross sections of O 3 and O 2 in the UV and Visible. Strongly affects atmospheric chemistry, thermal structure, and amount of deadly UV that doesn’t make it to the surface. Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
Rayleigh Scattering (light scattering by air as dipole radiation) Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
Atmospheric Temperature Profile: US “Standard” Atmosphere. From Liou Pat Arnott, ATMS 749 Atmospheric Radiation Transfer Cirrus cloud level. High cold clouds, visible optical depth range 0. 001 to 10, emits IR to surface in the IR window.
Solar Spectrum, Top of the Atmosphere and at the Surface Shaded region is solar irradiance removed by Rayleigh scattering and absorption by gases as indicated. (from Liou). Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
Electronic, Vibrational, energy levels and the big break up (dissociation level) From Liou Pat Arnott, ATMS 749 Atmospheric Radiation Transfer
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