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Rn = H + LE; G = ~0 <br /> <br /> <br /> <br />LE = Rn – H <br />G =~ 0 for daily estimate <br />ET Direct, SSEBop: <br />Using surface energy balance principles <br />SSEBop: Pre-defined dT <br />Varies in space and season <br />but constant from year-to-year <br />under clear-sky conditions <br /> <br />RS-ET possible under “clear sky” <br />conditions only. <br />ET as a Residual: <br />a <br />p <br />r <br />TaTsHc)( <br />ETodT <br />TcTsETa *)1( <br />c p <br />rRdT an <br /> <br />ETorR <br />TcTsETa <br />an <br />pc *))(1( <br />EToETfETET*heating evaporation <br />EToTcTsEToETas)(