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Table 3

Parameter distributions for 26 calibrated parameters

ParametersaCoupModel Severn (Forest)
Posterior distributionCoupModel Wye (Grassland)
Posterior
Posterior
MeanPost St.DCVbMeanPost St.DCV
Transpiration 
 Conduct max 0.060 0.024 0.41 U 0.057 0.027 0.48 
 WindLessExchangeCanopy 0.028 0.025 0.92 U 0.026 0.031 1.19 
 Conduct VPD 1.013 991.3 0.97 U 927.2 1.01 1.09 
 Conduct Ris 5.22 2.49 0.47 U 5.44 2.60 0.47 
 CritThesholdDry 4.83 2.79 0.57 U 4.71 2.73 0.58 
 Canopy height 15.65 3.25 0.20 U 13.48 3.91 0.29 
Interception 
 Maximal canopy cover 0.72 0.145 0.20 U 0.72 0.14 0.20 
 Max cover (Surface canopy cover) 0.724 0.14 0.20 U 0.71 0.14 0.20 
 Root depth −0.94 0.59 0.63 U −0.87 0.53 0.61 
 Leaf area index (LAI) 3.98 1.69 0.42 U 3.70 1.76 0.47 
 Water capacity per LAI. (Interception water storage capacity per LAI unit) 0.33 0.10 0.30 U 0.31 0.12 0.38 
Soil evaporation and snow process 
 EquilAdjustPsi (Vapor pressure at the soil surface) 1.25 0.67 0.53 U 1.27 0.79 0.62 
 RoughLBareSoilMom (Bare soil evaporation) 0.0096 0.01 1.10 U 0.012 0.012 0.95 
 MeltCoefAirTemp (Temperature coefficient in the empirical snow melt function) 2.416 0.86 0.35 U 2.60 0.94 0.36 
 MeltCoefGlobRad (Global radiation coefficient in the empirical snow melt function) 8.9 × 10−7 8.2 × 10−8 0.92 LN 6.89 6.2 × 10−8 0.90 
 OnlySnowPrecTemp (Below this temperature all precipitation is snow) −1.54 1.56 1.01 U −1.49 1.34 0.89 
 OnlyRainPrecTemp (Above this temperature all precipitation is rain) 3.05 1.14 0.37 U 3.10 1.25 0.40 
Soil water flow 
 Surface runoffCoef 2.0 1.11 0.55 U 2.15 1.145 0.53 
 AScale sorption (Sorption scaling coefficient for flow in the matric pore domain) 4.80 2.86 0.59 U 4.89 2.47 0.506 
Drainage and deep percolation 
 DrainLevel −1.20 0.45 0.37 U −1.25 0.47 0.38 
 DrainSpacing 1.194 2.01 1.68 U 1.49 2.41 1.61 
Soil water process 
 Total conductivity (1)–(2) 1.41 × 107 2 × 105 1.80 LN 7.81 × 106 1.3 × 105 1.71 
 Total conductivity (3) 5.68 2.53 0.44 Re 5.24 2.40 0.45 
 Tortuosity (1)–(3) 0.37 0.923 2.49 U 0.57 0.83 1.46 
 Lambda (1)–(3) 0.26 0.081 0.30 U 0.27 0.084 0.31 
 Air entry (1)–(3) 7.18 1.43 0.19 U 7.25 1.53 0.21 
ParametersaCoupModel Severn (Forest)
Posterior distributionCoupModel Wye (Grassland)
Posterior
Posterior
MeanPost St.DCVbMeanPost St.DCV
Transpiration 
 Conduct max 0.060 0.024 0.41 U 0.057 0.027 0.48 
 WindLessExchangeCanopy 0.028 0.025 0.92 U 0.026 0.031 1.19 
 Conduct VPD 1.013 991.3 0.97 U 927.2 1.01 1.09 
 Conduct Ris 5.22 2.49 0.47 U 5.44 2.60 0.47 
 CritThesholdDry 4.83 2.79 0.57 U 4.71 2.73 0.58 
 Canopy height 15.65 3.25 0.20 U 13.48 3.91 0.29 
Interception 
 Maximal canopy cover 0.72 0.145 0.20 U 0.72 0.14 0.20 
 Max cover (Surface canopy cover) 0.724 0.14 0.20 U 0.71 0.14 0.20 
 Root depth −0.94 0.59 0.63 U −0.87 0.53 0.61 
 Leaf area index (LAI) 3.98 1.69 0.42 U 3.70 1.76 0.47 
 Water capacity per LAI. (Interception water storage capacity per LAI unit) 0.33 0.10 0.30 U 0.31 0.12 0.38 
Soil evaporation and snow process 
 EquilAdjustPsi (Vapor pressure at the soil surface) 1.25 0.67 0.53 U 1.27 0.79 0.62 
 RoughLBareSoilMom (Bare soil evaporation) 0.0096 0.01 1.10 U 0.012 0.012 0.95 
 MeltCoefAirTemp (Temperature coefficient in the empirical snow melt function) 2.416 0.86 0.35 U 2.60 0.94 0.36 
 MeltCoefGlobRad (Global radiation coefficient in the empirical snow melt function) 8.9 × 10−7 8.2 × 10−8 0.92 LN 6.89 6.2 × 10−8 0.90 
 OnlySnowPrecTemp (Below this temperature all precipitation is snow) −1.54 1.56 1.01 U −1.49 1.34 0.89 
 OnlyRainPrecTemp (Above this temperature all precipitation is rain) 3.05 1.14 0.37 U 3.10 1.25 0.40 
Soil water flow 
 Surface runoffCoef 2.0 1.11 0.55 U 2.15 1.145 0.53 
 AScale sorption (Sorption scaling coefficient for flow in the matric pore domain) 4.80 2.86 0.59 U 4.89 2.47 0.506 
Drainage and deep percolation 
 DrainLevel −1.20 0.45 0.37 U −1.25 0.47 0.38 
 DrainSpacing 1.194 2.01 1.68 U 1.49 2.41 1.61 
Soil water process 
 Total conductivity (1)–(2) 1.41 × 107 2 × 105 1.80 LN 7.81 × 106 1.3 × 105 1.71 
 Total conductivity (3) 5.68 2.53 0.44 Re 5.24 2.40 0.45 
 Tortuosity (1)–(3) 0.37 0.923 2.49 U 0.57 0.83 1.46 
 Lambda (1)–(3) 0.26 0.081 0.30 U 0.27 0.084 0.31 
 Air entry (1)–(3) 7.18 1.43 0.19 U 7.25 1.53 0.21 

CV = coefficient of variance. Post St.D = standard deviation divided by the mean value. U = uniform distribution and LN = log normal distributions in posterior (100 accepted simulations) parameter distributions. The detailed meanings of each parameter can be found in the Appendix (available with the online version of this paper).

aParameter number within brackets.

bCV means coefficient of variation (=standard deviation divided by the mean) and PDF is the probability distribution function, including uniform (U), normal (N), and log-normal (LN) distributions, (Re) related to top layers.

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