Arga Island in the NW part of the delta. The third river terrace is the oldest geomorphological unit of the Lena Delta, shaped by the extremely cold climate of the last glacial period when the area was not [...] assumed. At the bottom of the snow layer, the remaining shortwave radiation flux is assigned as energy input to the uppermost soil grid cell. The albedo of the snow is calculated as a function of the difference [...] version of CryoGrid 3 so that the sum of the volumetric contents of ice and water re- mains constant (for simplicity, the densities of ice and wa- ter are assumed equal). The phase change of the soil wa-