Parameters selected for the stochastic optimization in CoupModel and their initial value and uncertainty ranges
| Parameters . | Unit . | Symbol . | Equation . | Prior . | |
|---|---|---|---|---|---|
| Appendix . | Min . | Max . | |||
| Transpiration and interception | |||||
| Leaf area index (LAI) | m2/m2 | A1 | (13) | 0 | 7 |
| Conduct max | m s−1 | gmax | (7) | 0.005 | 0.05 |
| Water capacity per LAI | mm/m2 | iLAI | (14) | 0.1 | 0.5 |
| CritThesholdDry (Response function to water soil potential) | cm water | ψc | – | 10 | 1 × 104 |
| Canopy height | M | HP | – | 0 | 20 |
| Maximal cover | – | cmax | – | 0.5 | 1 |
| Max cover | m2/m2 | pcmax | – | 0.5 | 1 |
| Root depth | M | – | – | −2 | −0.01 |
| Conduct VPD | Pa | gvpd | (7) | 100 | 4 × 103 |
| Conduct Ris | J/m2/day | gris | (7) | 1 × 104 | 1 × 107 |
| Windless Exchange Snow. Minimum turbulent exchange coefficient over bare soil | s−1 | ra,max,snow−1 | – | 0.001 | 0.1 |
| Soil evaporation and snow process | |||||
| EquilAdjustPsi (Vapor pressure at the soil surface) | – | ψeg | – | 0 | 3 |
| MeltCoefAirTemp (Temperature coefficient in the empirical snow melt function) | kg ◦C−1 m−2 day−1 | mT | – | 1 | 4 |
| MeltCoefGlobRad (Global radiation coefficient in the empirical snow melt function) | kg J−1 | mRmin | – | 1 × 10−7 | 3 × 10−6 |
| OnlySnowPrecTemp. Below this temperature all precipitation is snow | °C | TSnowL | – | −4 | 1 |
| MeltCoefAir | kg °C−1m−2 day−1 | mT | – | 1 | 5 |
| RoughLBareSoilMom | m | z0M | – | 0.001 | 1 × 107 |
| Soil water flow | |||||
| SurfCoef | 1/day | asurf | – | 0.1 | 4 |
| AScale sorption | – | – | 0.1 | 10 | |
| Drainage and deep percolation | |||||
| Drain level | m | zp | (16), (17) | −2 | −0.3 |
| Drain spacing | m | dp | (16), (17) | 10 | 1 × 104 |
| Soil water process | |||||
| n Tortuosity (1)–(3) | – | n | – | −1 | 2 |
| Lambda (1)–(3) | – | λ | (15) | 0.1 | 0.4 |
| Air entry (1)–(3) | cm water | ψa | (15) | 0.1 | 0.4 |
| Parameters . | Unit . | Symbol . | Equation . | Prior . | |
|---|---|---|---|---|---|
| Appendix . | Min . | Max . | |||
| Transpiration and interception | |||||
| Leaf area index (LAI) | m2/m2 | A1 | (13) | 0 | 7 |
| Conduct max | m s−1 | gmax | (7) | 0.005 | 0.05 |
| Water capacity per LAI | mm/m2 | iLAI | (14) | 0.1 | 0.5 |
| CritThesholdDry (Response function to water soil potential) | cm water | ψc | – | 10 | 1 × 104 |
| Canopy height | M | HP | – | 0 | 20 |
| Maximal cover | – | cmax | – | 0.5 | 1 |
| Max cover | m2/m2 | pcmax | – | 0.5 | 1 |
| Root depth | M | – | – | −2 | −0.01 |
| Conduct VPD | Pa | gvpd | (7) | 100 | 4 × 103 |
| Conduct Ris | J/m2/day | gris | (7) | 1 × 104 | 1 × 107 |
| Windless Exchange Snow. Minimum turbulent exchange coefficient over bare soil | s−1 | ra,max,snow−1 | – | 0.001 | 0.1 |
| Soil evaporation and snow process | |||||
| EquilAdjustPsi (Vapor pressure at the soil surface) | – | ψeg | – | 0 | 3 |
| MeltCoefAirTemp (Temperature coefficient in the empirical snow melt function) | kg ◦C−1 m−2 day−1 | mT | – | 1 | 4 |
| MeltCoefGlobRad (Global radiation coefficient in the empirical snow melt function) | kg J−1 | mRmin | – | 1 × 10−7 | 3 × 10−6 |
| OnlySnowPrecTemp. Below this temperature all precipitation is snow | °C | TSnowL | – | −4 | 1 |
| MeltCoefAir | kg °C−1m−2 day−1 | mT | – | 1 | 5 |
| RoughLBareSoilMom | m | z0M | – | 0.001 | 1 × 107 |
| Soil water flow | |||||
| SurfCoef | 1/day | asurf | – | 0.1 | 4 |
| AScale sorption | – | – | 0.1 | 10 | |
| Drainage and deep percolation | |||||
| Drain level | m | zp | (16), (17) | −2 | −0.3 |
| Drain spacing | m | dp | (16), (17) | 10 | 1 × 104 |
| Soil water process | |||||
| n Tortuosity (1)–(3) | – | n | – | −1 | 2 |
| Lambda (1)–(3) | – | λ | (15) | 0.1 | 0.4 |
| Air entry (1)–(3) | cm water | ψa | (15) | 0.1 | 0.4 |
An index of 1 or 2 or 3 within brackets means that the parameter represents the characteristics of forest and grassland layers or understorey layers by the respective value of the index.