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Fig. 1. Schematic diagram representing the (a) ALEXI and (b) DisALEXI modeling schemes, coupling atmospheric boundary layer (ABL) and two-source surface energy balance (TSEB) submodels. The models compute fluxes of sensible heat (H) from the soil and canopy (subscripts c and s) along gradients in temperature (T), and regulated by transport resistances RA (aerodynamic), RX (bulk leaf boundary layer) and RS (soil surface boundary layer). DisALEXI uses the air temperature predicted by ALEXI near the blending height (TA) to disaggregate 5-km ALEXI fluxes, given vegetation cover [f(
i)] and directional surface radiometric temperature [TRAD(i)] information derived from high-resolution remote-sensing imagery at look angles i. See Norman et al. (2003) for further details.
