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ALEXI: regional ET modeling system Regional scale <br /> DTRAD - Geostationary <br /> Ta - ABL model <br />Surface temp: <br />Air temp: <br />TRAD (φ), fcTRAD (φ), fc <br />Rsoil <br />Tc <br />Tac <br />Hs <br />Ts <br />Ra H = Hc + Hs <br />Rx <br />Hc <br />Ta <br />ABL <br />Ta <br />ALEXI DisALEXI <br />5 km <br />30 mTwo-Source ModelTRAD,i(φi), fc,i <br />i <br />Ra,i <br />Blending height <br />Energy balance: <br />ET = (RNET - G) - H <br />T <br />E <br />(Atmosphere-Land Exchange Inverse model) <br />Blending height <br />USCID ET Workshop – October 2016 <br />ALEXI uses measurements of <br />morning surface temperature <br />rise from geostationary <br />satellites… <br /> <br />…time changes in temperature <br />can be measured more <br />accurately than instantaneous <br />temperature. <br />ATMOSPHERE-LAND <br />EXCHANGE INVERSE MODEL