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A Two-Source Energy Balance Approach Using Directional Radiometric Temperature Observations for Sparse Canopy Covered Surfaces

Dep. of Soil Science, Univ. of Wisconsin, 1525 Observatory Dr., Madison, WI 53706 USA

View larger version (22K): [in a new window]   Fig. 1 Comparison of canopy net radiation, RN,C, and soil net radiation, RN,S, and soil heat flux, G, predicted by the original N95 model version (solid circles), N95O, (except for modifications to resistance to heat transfer from the soil, RS, and Priestley-Taylor coefficient, PT, used in estimating canopy transpiration) and the new version, N95N, (open squares) which includes the new net radiation divergence formulation and clumping factor (see also Kustas and Norman, 1999a). Time along the abscissa is in Mountain Standard Time (MST)

View larger version (29K): [in a new window]   Fig. 4 Soil surface temperatures, TS, and canopy temperatures, TC, predicted by N95O and N95N model versions vs. observed radiometric temperatures of the soil surface and canopy components (see text). Line represents perfect agreement

View larger version (30K): [in a new window]   Fig. 2 The soil sensible, HS, and latent, LES, heat fluxes and canopy sensible, HC, and latent, LEC, heat fluxes from both N95O (solid circles) and N95N (open squares) model versions. Time along the abscissa is in Mountain Standard Time (MST)

View larger version (26K): [in a new window]   Fig. 3 Total sensible, H, and latent, LE, heat fluxes predicted by N95O and N95N model versions vs. observed heat fluxes. Line represents perfect agreement