6. One paragraph description of your model (e.g. abstract from report or
   paper);

The model deals with all main processes which occur in the snow cover and
freezing soil. In the beginning of the cold season these processes
include accumulation of snow at the surface; coverage of vegetation by
snow with corresponding changes of albedo and aerodynamic roughness;
cooling of thin upper soil layer below 0^C due to the energy exchange at
the surface; moving of the frosen zone into the soil considering the
external cooling and heat flux from the deeper layers; freezing of the
soil water keeping the zero temperature near the freezing front; upward
flux of liquid water to the front with its freezing.
   The main processes of the melting period are: snow melting (due to
heat income with rain or warm fog, or excess of energy income at upper or
lower boundary) with secondary refreezing of melt water in the snow
cover; melting of the upper soil layer due to the excess of available
heat; melt water infiltration into the frozen layers with partial
refreezing.
   Except for meteorological parameters need for the model as forcing,
one needs the ground temperature at a depth lower than the soil layer
(for example, 3 m) once a week or a month. If the water table is located
closely enough to the lower soil boundary, its depth must be specified
too. In this case the water table provides additional water influx to
the soil where the water can freeze.

50. Please provide references relevant to the model description and use.

Shmakin, A.B., 1998: The updated version of SPONSOR land surface scheme: PILPS-influenced improvements. Global and Planetary Change, 19(1-4), 49-62.

Shmakin, A.B., 1999: Testing of cryologic landsurface parameterization scheme for seasonally frozen ground and seasonally melt permafrost. Preprints, 14th Conference on Hydrology, 10-15 January 1999, Dallas, TX, pp., 425-426.


-- Last updated Fri Oct 8 12:47:54 MST 1999 by Zong-Liang Yang.
For questions and comments, please contact Zong-Liang Yang