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lec 8 - from gases absorbed light from particles Actinic...

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173 : Atmospheric Chemistry Lecture 8: FP P 4 : Photochemistry *[email protected]
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Last Day Recap: Photochemistry basics, light absorption Questions?
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Today 1. Light Absorption Part 2 2. Atmospheric Photochemistry 3. Photochemistry of (Atmospherically) Important Species
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Today 1. Light Absorption Part 2 2. Atmospheric Photochemistry 3. Photochemistry of (Atmospherically) Important Species
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Today 1. Light Absorption Part 2 2. Atmospheric Photochemistry 3. Photochemistry of (Atmospherically) Important Species
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http://upload.wikimedia.org/wikipedia/com mons/a/a1/Blackbody-lg.png
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Photochemisty Definitions Absorbance (A): log I/Io (Transmittance –log T = A) Optical Depth: I/Io=exp( σ Nl) < optical depth Attenuation Coefficient (t): Sum of scattered light from gases + scattered light from particles + absorbed light
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Unformatted text preview: from gases + absorbed light from particles Actinic Flux F( λ ) : Sum of direct and indirect light on V from all directions Radiance L( λ ) : As for above but for a given direction Irradiance E( λ ) : Net flux across a flat surface (instrumental definition) Albedo: Fraction of direct radiation back reflected (for whole Earth 0.3 – 0.4) Today 1. Light Absorption Part 2 2. Atmospheric Photochemistry 3. Photochemistry of (Atmospherically) Important Species O 2 Photochemisty O 3 Photochemisty Φ = 0.06 + A exp[-B/T] O 3 Photochemisty : Switch to the Troposphere Today 1. Light Absorption Part 2 2. Atmospheric Photochemistry 3. Photochemistry of (Atmospherically) Important Species...
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