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WP 250: Radiative Transfer Model Assumptions and Earth Curvature (December 2001)

WP 250: Radiative Transfer Model Assumptions and Earth Curvature (December 2001) Study of two effects: Spherical vs. Plan-parallel approximations in CDI Step 1: CDI Simulation of 24 scenarios using plan parallel approximations (constant SZA along LOS)

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WP 250: Radiative Transfer Model Assumptions and Earth Curvature (December 2001)

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  1. WP 250: Radiative Transfer Model Assumptions and Earth Curvature • (December 2001) • Study of two effects: • Spherical vs. Plan-parallel approximations in CDI • Step 1: CDI Simulation of 24 scenarios using plan parallel approximations (constant SZA along LOS) • Step 2: calculation of error spectra by taking differences to earlier spherical CDI simulations • Step 3: Error analysis using linear mapping (DOAS & Profiling) • Refraction at large solar zenith angles (>80°) • Step 1: Implementation of refraction in CDI (February!) • Step 2: CDI simulation of 75S and 75N trace gas scenarios (8 scenarios) • Step 3: error spectra calculation • Step 4: error analysis

  2. WP 260: Non-Lambertian BRDF Surface Reflection • (January 2002) • Step 1: Selection of BRDF ( see PR1): • snow (very bright) • North African desert (bright) • tropical forrest (dark surface) • glint (selection of appropriate input parameters for glint model needed) • Step 2: RPV implementation in CDI (early January) • Step 3: Reference CDI calculation with equivalent effective Lambertian reflectivity to form difference spectra (12 scenarios) • Step 4: Error analysis Snow BRDF 40°SZA, 300-330nm Desert BRDF 40°SZA, VIS

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