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Xin Xi - Aerosol direct effect on surface net radiation and...

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    Aerosol direct effect on surface net radiation and PAR over different surfaces Xin Xi 4/24/2008
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    Motivation 1. Aerosols affect radiative transfer via absorption and scattering, which are determined by the optical properties of different aerosol types. 2. Aerosols affect both surface net radiation Rn=S(1-a)+L-σT 4 (0.25~100 μm) and PAR (0.38~0.75μm). 3. Aerosol not only reduce Rn and PAR, but also increase the diffuse components, which has significant influence on plant photosynthesis. 4. As the lower boundary condition in RT calculation, surface albedo and emissivity varies with different surface type and structure. 5. The relation between Rn and PAR was rarely studied in aerosol-laden conditions.
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    RT scheme SBDART ( S anta B arbara D ISORT A tmospheric R adiative T ransfer) Scheme 1. Solar spectrum LOWTRAN-7 ; 6S; MODTRAN-3 2. Atmospheric profile tropic; midlatitude summer ; midlatitude winter; subarctic summer; subarctic winter; US62; user-defined. 3. Molecular absorption
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