Table 4. List of model water retention and percolation, meltwater refreezing, snow density, heat capacity and conductivity, vapor transfer, heat transfer between snowpack and the underlying soil, and heat convected by rainfall or snowfall



Model Name Retention/percolation Refreezing Density Heat capacity/conductivity Vapor transfer Heat transfer between snowpack and underlying soil Heat convected by rainfall or snowfall
Australian N/a No Fixed Fixed No No No
BAIM Liquid water retention is explicitly treated. Water in excess of the maximum value that snow layer can hold drains away and flows down to the soil surface without any time lag. No Changing Changing No Yes Yes
BASE No yes (optional) changes changes (optional) No yes can do (doesn't seem to really matter)
BATS No Yes Changing Changing No No No
CLASS Yes Yes Changing Changing No Yes Yes
CROCUS Yes Yes Changing Changing NOT EXPLICITELY, "effective conduction" used Yes Yes
DARSSM No Yes prognostic variable heat capacity and conductivity are function of snow density which is a prognostic variable no yes, this is the combined snow and soil model yes
DHSVM liquid water retention is modeled as a simple reservoir. Until the liquid water storage capacity is met, no percoloation to the pack layer or the soil surface is allowed No Snow density is not calculated, depth of snow is not a state variable, only the SWE is fixed yes No yes
ECHAM (Duemenil) No No Fixed. Fixed. No YES No
ECHAM (Loth) Yes indirectly prognostic variable heat capacity fixed; conductivity: function of density YES YES YES
GFDL Snow Model No No Fixed Fixed No - No
Hadley Centre/UKMO GCM LSM No No Fixed Fixed No yes No
HBV No, the water storage is just intended to delay/reduce outflow compared to melting No Snow density (or depth) is not represented, only SWE is considered No No No No
IAP94 Yes Yes Changing Changing Yes Yes Yes
IHACRES Snow Model No No We compared the results of modelling with measured Snow Water Equivalent, thus, the snow density is already taken into account during the measurements N/A No No N/A
INM Yes No Fixed fixed No No Yes
ISBA No No Changing Changing No only in its "offline" version No
ISBA-ES Yes Yes Changing Changing Yes Yes Yes
LSMCS Yes Yes Changing Changing No Yes Yes
MAPS/RUC SVS No No Fixed Fixed No Yes The model considers heat convected by rain
MAR Yes Yes Changing Changing No; effective conduction used Yes Yes
Mosaic No No Fixed Fixed No No No
MRI-CGCM GHM No No Fixed Fixed No Yes No
MU-SNW No No Fixed Fixed No No No
NCEP/OH/OSU CAPS No No Fixed Fixed No Yes Yes
NCEP/OH/OSU LSM Yes Yes Changing Changing No Yes Yes
NWSRFS SNOW-17 - - - - - - -
RAMS Snow Component No No No explicit specification of density Fixed heat capacity; conductivity not specified No Snowpack and immediately underlying soil are considered to be a single heat reservoir No
RGM YES NYI fixed fixed NYI NYI NYI
SEMS Yes Yes Changing Changing No No No
SHAW Liquid water retention is explicitly treated, but not percolation Changes in thermal properties due to meltwater refreezing are considered, but hydraulic properties are not Changing Changing YES YES YES
SLURP No No model uses only snow water equivalent heat content not tracked No yes No
SNAP Yes The version supplied to the Army now has constant properties, but current work on the model involves layering and property evolution Changing Changing No Yes Yes
SNOWPACK Yes Yes Changing Changing Not explicitely, but implicitely using ET and TG metamorphis Yes Implicitely using an initial snow temperature, No rain at present
SNTHERM Yes Yes Changing Changing Yes Yes Yes
SNTHERM (Davis) - - - - - assumed semi-infinite snow. Deep enough for no transfer at bottom boundary -
SNTHERM.ver4 - - - - - assumed semi-infinite snow. Deep enough for no transfer at bottom boundary -
SOIL Water transfer within the snowpack is not considered. A certain retention capacity of the snowpack is assumed. When it is exceeded the water is infiltrating to the soil or running of on the soil surface No changing changing No Yes No
SSMI DSCM Yes Yes - - - - -
SPONSOR Yes Thermal properties are changing according to the snow density transformations Changing Changing No yes The heat convected by liquid rain is considered; the heat brought by snowfall is not accounted
SPS (CAPS-LLNL) No No fixed changes as a function of snowdepth No No Yes
SSiB No Yes Fixed Fixed No Yes Yes
TSCM1 Yes No Fixed Fixed No Yes No
TSCMM Yes No Changing Changing No Yes Yes
UEB Yes No Fixed Fixed No Yes in a rough way Yes

(Prepared by Zong-Liang Yang and Guo-Yue Niu)


-- Last updated Fri Oct 8 12:58:32 MST 1999 by Zong-Liang Yang.
For questions and comments, please contact Zong-Liang Yang