online_shuttleworth_wallace:   Calculation of evapotranspiration using the Shuttleworth-Wallace method Solar evaporator at Red Rock Ranch, Panoche Water District, Fairbaugh, California References: Aguilar, R. D., and V. M. Ponce. 2013. Evapotranspiration using the Shuttleworth-Wallace method. Shuttleworth, J. W., and J. S. Wallace. 1985. Evaporation from sparse crops-an energy combination theory, Quarterly Journal of the Royal Meteorological Society, III, 839-855. Formulas Δ = (0.00815 Ta + 0.8912)7 rac = rb /(2L) rsc = rST /(2L) Ra = (Δ + γ) raa Rs = (Δ + γ) ras + γrss Rc = (Δ + γ) rac + γrsc Rns = Rn e-CL A = Rn - 0.2Rns As = 0.8Rns Cc = 1 / {1 + (Rc Ra) / [Rs (Rc + Ra)]} Cs = 1 / {1 + (Rs Ra) / [Rc (Rs + Ra)]} PMc = [ΔA + (ρacpD - ΔracAs) / (raa + rac)] / [Δ + γ {1 + rsc/(raa + rac)}] PMs = [ΔA + (ρacpD - Δras(A - As) / (raa + ras)] / [Δ + γ {1 + rss/(raa + ras)}] λEc = Cc PMc λEs = Cs PMs λE = λEc + λEs INPUT DATA:        [Sample Input]      [Parameter Ranges] Air temperature Ta (°C):     Mean boundary layer resistance per unit area of vegetation rb (s m-1):     Mean stomatal resistance rST (s m-1):     Projected area of leaf per unit ground area L (leaf area index) (dimensionless):     Aerodynamic resistance between canopy source height and reference level raa (s m-1):     Aerodynamic resistance between the substrate and canopy source height ras (s m-1):     Surface resistance of the substrate rss (s m-1):     Net radiation flux into the complete crop Rn (W m-2):     Vapor pressure deficit at reference height D (Pa):     Extinction coefficient C (dimensionless):     Leave blank to set default C = 0.7 Atmospheric pressure P (Pa):     Leave blank to set default at sea level, P = 101325 Please enter input data and press 'Calculate'. ⇐ ⇐ ⇐   Your request was processed at  04:13:55 pm on December 21st, 2024   [ 241221  16:13:55 ]. Thank you for running online_shuttleworth_wallace.   Please call again.   [130711]