RFC #1
The parametrization of goltsy landscape was developed with the use of observational data from the Suntar-Khayata Station (Grave, 1959; Grave & Koreisha, 1957, 1960; Koreisha, 1963).
The set of the model parameters representing physical properties of the soil (ground) column was elaborated based on the detailed description of goltsy landscape, its ground profiles (Grave & Koreisha, 1957) and physical properties of ground column at different depths, such as density, porosity, water capacity, heat conductivity (Table 2) (Grave, 1959; Grave & Koreisha, 1960; Grave et al., 1964; Koreisha, 1963).
Assigned values of specific density and porosity for all 20 CSL are 2700 kg/m3 and 42%. Maximum water holding capacity is 0.12; maximum ice holding capacity is 0.22-0.32 according to Grave (1959) and is taken as an average value of 0.26. Specific heat capacity of ground particles in dry condition accounts for 840 J/kg °С, and specific heat conductivity – 1.5 W/m °С. The infiltration coefficient (assigned as 10, 5, 1 and 0.1 mm/min for the ground layers 10, 20, 30 cm and below 30 cm, respectively) was not determined at the Suntar-Khayata Station and is adopted from (Semenova et al., 2013) for similar landscape of the Kolyma water balance station.
The hydraulic parameters of the runoff elements (1) in ground profile (Semenova et al., 2013; Vinogradov et al., 2011) were determined by manual calibration using the observed hydrographs and based on the general ideas about the runoff formation processes. For example, runoff generation in the upper horizon of ground profile is much faster than in the mineral layer. The value of this parameter is estimated as 10 at the upper layer and 0.005 at the bottom layer.
The boundary conditions of the ground temperature at a constant depth were taken from the average monthly soil temperature data at the 4 m depth at the Suntar-Khayata Station in 1958. The minimum value of the ground temperature reaches -11.7 ºС in May, the maximum is -6.7 ºС in October.
The parameter of heat supply from the atmosphere to soil surface may be treated as the heat transfer coefficient between atmosphere and soil surface under conditions of instantaneous energy withdrawal from the surface of contact. Depending on the vegetation density above the soil surface, the value of the parameter changes with increasing vegetation height/density from 1.0 (RFC #1) to 3.0 (RFC#3-4) (Semenova et al., 2014).