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

It is a layerd model, which can be used for stand-alone experiment now 
as well as be implemented with atmospheric model. The key process 
described in the model are:

 1). compaction of snow layer due to several effects
 2). describe mass and energy balancve by considering many internal 
     process such as liquid water transmission, heat conduction, 
     melting/freezing/runoff and so on.
 3). snow pack is layered with different thicknesses.

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

Sun, S.F., Jin, J.M., and Xue, Y. 1999. A simple Snow-Atmosphere-Soil Transfer
(SAST) Model, J. Geophys. Res., (submitted).

Jin, J.M., X. Gao, S. Sorooshian, Z.-L. Yang, R.C. Bales, R.E. Dickinson, S.-F. Sun and G.-X. Wu, 1999:
One-dimensional snow water and energy balance model for vegetated
surfaces, Hydrological Processes, (in press).
[Abstract]

Jin, J.M., X. Gao, Z.-L. Yang, R.C. Bales, S. Sorooshian, R.E. Dickinson, S.-F. Sun and G.-X. Wu, 1999:
Comparative analyses of physically based snowmelt models for climate
simulations. Journal of Climate, (in press).
[Abstract]