01291naa a2200229 a 450000100080000000500110000800800410001910000180006024500950007826000060017352006640017965000110084365000230085465000120087765000240088965300120091365300120092565300210093765300180095870000180097677300670099410776281996-06-27               bl ---       0--  u    #d1 aTANNER, C. B.  aPotential evapotranspiration estimates by the approximate energy balance method of Penman.  c0  aThe energy balance approximation of Penman, used to estimate potentialevapotranspiration, was tested for daily estimates on 37 days during 1956 and 1957. Though the Penman estimates were highly correlated with those obtained from detailed energy balance measurements, the absolutevalues of the Penman estimates were much too small. In order to obtainsuitable daily estimates of evapotranspiration with the Penman method,a wind function that accounts for surface roughness and direct measurements of radiation energy were found necessary. The stomatal and daylength factors proposed by Penman and Shofield appeared to have little basia for general application.  aenergy  aevapotranspiration  aEnergia  aEvapotranspiração  aBalance  aBalanco  aMetodo de Penman  aPenman method1 aPELTON, W. L.  tJournal of Geophysical Researchgv.65, n.10, p.3391-3913, s.d.