The surveyed resistivity data was inverted and Archie's law was used to calculate volumetric soil moisture by estimating parameters and comparing against field measured data.
Second, this relationship is used to calculate the representative soil moisture time series at a certain spatial scale.
The soil storage component of the model uses soil properties to calculate how much soil moisture is available for plant evapotranspiration.
The combination of NN and CM by using snow accumulation and the soil moisture calculated by the CM as input to the NN proved to be an excellent alternative to perform high quality monthly runoff simulations and improved the simulations skill for both basins (R2=0.86 and 0.75, respectively).
Otherwise, the actual G is equivalent to the maximum G. Step 6. Calculate the change in soil moisture content (DW) = (ETcrop - actual G).
Soil storage is also independent from the other hydrologic dynamics, except that groundwater recharge, calculated as infiltration below the zone of evapotranspiration, is calculated only from surplus, after soil moisture capacity has been filled.
SMDS is calculated based on the monthly soil moisture of upper 50 cm from the simulation by Community Land Model CLMM 4.0) and SPI is calculated based on gridded precipitation at 0.05° resolution (5 km × 5 km approximately), which is spatially interpolated from observations.
In the BCM, AET is calculated on the basis of soil moisture content that diminishes over the dry season; therefore, in Mediterranean climates with minimal summer precipitation, PET exceeds AET, thus accumulating the annual deficit.
A recent tree ring analysis from across the boreal forest of Canada found a positive effect of a long-term soil moisture index (calculated using precipitation and evapotranspiration rates) and growth (Girardin et al. 2016).
For each grid cell, the available soil moisture is calculated per day by adding in- and outgoing fluxes to the available soil moisture of the day before.
