Required input variable definitions #1
Description
1. Required variables
1.1 Time Series inputs (vectors .dat)
1.2 Site-specific characteristic
1.3 Soil Initial Conditions (soil_init.mat)
1.4 Soil Properties (soil_parameters.mat)
1.1 Time Series inputs (vectors .dat)
| symbol | variable long name | short definition | unit | value range | observation |
|---|---|---|---|---|---|
| rain_ | Precipitation | [cm s-1] | 1 cm/s = 36000 mm/h | ||
| Ta_ | Air Temperature | [°C] | |||
| RH_ | Relative Humidity | [%] | 0 <= RH <= 100 | ||
| p_ | Atmospheric Pressure | [hPa] | |||
| u_ | Wind speed | [m s-1] | u >= 0.05 | ||
| CO2_ | Carbon Dioxide Concentration | [mg m-3] | |||
| Rin_ | Incoming Shortwave Radiation | [W m-2] | |||
| Rli_ | Incoming Longwave Radiation | [W m-2] | |||
| LAI_ | Leaf Area Index | [m2 m-2] | 0.01 <= LAI <= 10 | ||
| ea_ | Air Vapor Pressure | [hPa] | eq-01 | ||
| VPD_ | Vapor Pressure Deficit | [hPa] | eq-02 | ||
| tts_ | Zenith Solar Angle | [-] | |||
| t_ | Timestamp (doy_float) | [-] | decimal Julian day | ||
| year_ | Year | [integer] | Calendar year | ||
| Cab_ | Chlorophyll ab | [ug cm-2] | |||
| hc_ | Canopy Height | [m] | hc >= 0.01 |
$ea = 6.107*10^{7.5 * Ta \choose 237.3 + Ta}* {RH\choose 100}$ (eq-01)
$VPD = 6.107*10^{7.5 * Ta \choose 237.3 + Ta}* 1 - {RH\choose 100}$ (eq-02)
1.2 Site-specific characteristics
| symbol | variable long name | short definition | unit | value range | observation |
|---|---|---|---|---|---|
| sitename | Name on the site | string | 2 chr - 3 chr (DE-C01) | ||
| Dur_tot | Number of timestamps | double | |||
| DELT | Timestep size in seconds | double | 60x30min or 60x60min hourly | ||
| latitude | Latitude (x) | degree | |||
| longitude | Longitude (y) | degree | |||
| elevation | Altitude (DEM) | [m] | |||
| reference_height | Measurement Height (z) | [m] | |||
| IGBP_veg_long | Long name IGBP vegetation class | string | |||
| canopy_height | Canopy Height (hc) | [m] |
1.3 Soil Initial Conditions (soil_init.mat)
| symbol | variable long name | short definition | unit | value range | observation |
|---|---|---|---|---|---|
| SWC | Initial soil water content | [m3 m-3] | “volumetric soil water” layer 1 to 4 (swvl1, swvl2, swvl3, swvl4) | ||
| Ts | Initial soil temperature | [°C] | "Skin temperature” (skt) and “Soil temperature” level 1 to 4 (stl1, stl2, stl3, stl4) |
note: data from CDS ERA5 Land
1.4 Soil Properties (soil_parameters.mat)
| symbol | variable long name | short definition | unit | value range | observation |
|---|---|---|---|---|---|
| SaturatedK1 | Saturated hydraulic conductivity | [cm s-1] | 1x6 [Ks]/(24*3600) cm d-1 | ||
| ks01 | First element of SaturatedK vector | [cm s-1] | 1x1 | ||
| porosity1 | Porosity | [m3 m-3] | |||
| theta_s01 | First element of porosity vector | [m3 m-3] | 1x1 | ||
| SaturatedMC1 | Saturated SWC | [m3 m-3] | 1x6 [thetas] | ||
| ResidualMC1 | Residual SWC | [m3 m-3] | 1x6 [thetar] | ||
| Coefficient_Alpha1 | Coefficient Alpha | [cm-1] | 1x6 [alpha] | ||
| Coefficient_n1 | Coefficient n | [-] | 1x6 [n] | ||
| fieldMC2 | Field Capacity | [m3 m-3] | 6x1 | ||
| FOS3 | Sandy Fraction | fraction (/100) | 6x1x1 [SAND1/2] | ||
| FOC3 | Clay | fraction (/100) | 6x1x1 [CLAY1/2] | ||
| MSOC3 | Organic Fraction (Carbon) | fraction (/10000) | 6x1x1 [OC1/2] | ||
| fmax | [-] | 1x1 surfdata | |||
| Coef_Lamda4 | Lambda per depth | [-] | 6x1x1 Lambda folder |
[1] Derived from the PTF_SoilGrids_Schaap datasets (n, alpha, Ks, thetas, thetar) from the valid depths: 0, 5, 15, 30, 60, 100 and 200 cm (sl1 to sl7), excluding sl3 (15cm).
[2] Calculated field capacity form field moisture content\
$fieldMC = theta_r + (theta_s - theta_r) / (1 + (alpha*phi_fc)^{coef_n})^{(1 - (1 / coef_n))}$ (eq-03)
where phifc = 341.9 - soil water potential at field capacity (cm)
3 Both layers (1, 2) are combined, and the values from depths 1,3,5,6,7,8 are used per variable
4 Only the Lambda file layers l1, l3, l5, l6, l7, l8 (depth_indices) were combined and used