SEBAL - Dca.ufcg.edu.br

Figure 3. Flow Chart of the Net Surface Radiation ComputationR n = (1-α)R S↓ + R L↓ - R L↑ - (1-ε 0 )R L↓model F09SurfacealbedoαIncomingshortwaveR S↓OutgoinglongwaveR L↑IncominglongwaveR L↓model F04spreadsheetmodel F08spreadsheetAlbedo-top ofatmosphereα toamodel F03Surfaceemissivitiesε ΝΒ & ε οSurfacetemperatureT Smodel F07Reflectivitymodel F06ρ λmodel F02SpectralradianceL λNDVISAVILAImodel F05model F01The computer model number used for each computation is given along with the variablename. The computation steps begin at the bottom of the figure with model F01 andcontinue upward to model F09 for the computation of R n . The two terms R S↓ and R L↓ arecomputed with a spreadsheet or a calculator rather than the Model Maker tool.15