[Wrf-users] about LSM-Noah

[zhang chunxi]

         I use NCEP Final Analysis Data(FNL) as IC and BC, and AGRMET for LSM-Noah.
         In my 'wrfsi.nl' , I set like this:

                 INIT_ROOT = 'AVN',
                 LBC_ROOT = 'AVN', 
                 LSM_ROOT = 'AGRMET',
         After run 'wrfsi.pl', I get the data I want. But when I use command 'siscan' to check the first file 'hinterp.d01.2004-05-20_12:00:00'( the start time model run), I get the following information.

       
                Scanning hinterp.d01.2004-05-20_12:00:00
 Domain Metadata Information
 -----------------------------------------------------
Domain Number .........  1
Parent ID .............  1
Dynamic Init. Source .. SI
Static Init. Source ... SI
Valid Date (YYYDDD) ... 2004141
Valid Time (sec UTC) .. 43200.0
Origin X in Parent ....     1
Origin Y in Parent ....     1
Nest Ratio to Parent ..     1
Delta X ............... 27000.0
Delta Y ............... 27000.0
Top Level .............   1000.0
Origin Z in Parent ....     0
X dimension ...........   107
Y dimension ...........   107
Z dimension ...........    27
  ---------------------------------------------------
  
 Variables found:
 NAME    S D   NX   NY   NZ  UNITS        DESCRIPTION       MINVAL   MAXVAL   AVGVAL
 ------- - - ----- ----- --- ------------ ---------------- -------- -------- --------
PRESSURE 0 1    27     0   0     Pa       Pressure levels     1000.  200100.   53819.
T        4 3   107   107  27     K        Temperature       189.694  307.266  256.854
U        4 3   107   107  27     m s-1    U                -14.1117  71.2432   8.4297
V        4 3   107   107  27     m s-1    V                -54.3173  56.5025  -0.2652
RH       4 3   107   107  27     %        Relative Humidit   1.0000 100.0000  47.1628
HGT      4 3   107   107  27     m        Height              -126.   31141.    8747.
SOILHGT  1 2   107   107   0     m        Terrain height       0.00  2834.49   340.67
SNOW     1 2   107   107   0     kg m-2   Water Equivalent 0.000000 0.000000 0.000000
SNOWH    1 2   107   107   0     m        Snow Depth       0.000000 0.000000 0.000000
SKINTEMP 1 2   107   107   0     K        Skin Temperature    0.000  301.683  146.937
ST000010 1 2   107   107   0     K        T of 0-10 cm gro    0.000  303.190  147.738
ST010040 1 2   107   107   0     K        T of 10-40 cm gr    0.000  302.641  146.090
ST040100 1 2   107   107   0     K        T of 40-100 cm g    0.000  301.764  145.023
ST100200 1 2   107   107   0     K        T of 100-200 cm     0.000  300.343  144.070
SM000010 1 2   107   107   0              Soil Moisture of 0.000000 0.429146 0.136179
SM010040 1 2   107   107   0              Soil Moisture of 0.000000 0.423807 0.141847
SM040100 1 2   107   107   0              Soil Moisture of 0.000000 0.427783 0.140940
SM100200 1 2   107   107   0              Soil Moisture of 0.000000 0.450000 0.150193
SW000010 1 2   107   107   0              Soil Moisture (l 0.000000 0.429146 0.136179
SW010040 1 2   107   107   0              Soil Moisture (l 0.000000 0.423807 0.141847
SW040100 1 2   107   107   0              Soil Moisture (l 0.000000 0.427783 0.140909
SW100200 1 2   107   107   0              Soil Moisture (l 0.000000 0.450000 0.149878
CANWAT   1 2   107   107   0     m        Plant Canopy Sur 0.000000 0.500000 0.039957
GREENFRC 4 2   107   107   0              Vegetation Green   0.0000  85.7725  21.7871
PMSL     4 2   107   107   0     Pa       Sea-level Pressu   99150.  100977.  100220.     
PSFC     4 2   107   107   0     Pa       Surface Pressure   71825.  101604.   96702.
SM010200 1 2   107   107   0     kg m-3   Soil Moist 10-20 0.000000 0.386000 0.121447
ST010200 1 2   107   107   0     K        T 10-200 cm belo    0.000  298.415  142.772
SEAICE   1 2   107   107   0     proprtn  Ice flag         0.000000 0.000000 0.000000
 End of file reached.


I have two questions:
  first:   Why Z dimension is 27?  What I set in wrfsi.nl is 36.
  second:  Why the minimun value of SKINTEMP is 0.00?   In fact, there are many zero values with variable 'TSK' in 'wrf_real_input_em.d01.2004-05-20_12:00:00'.  For example:


  290.1357, 290.1472, 289.5466, 288.9395, 288.3876, 288.1352, 287.4099, 
    286.7165, 286.7733, 286.2317, 284.9146, 282.6699, 282.5198, 282.7013, 
    283.0661, 283.3499, 283.1041, 282.6663, 283.2555, 283.3078, 283.4684, 
    284.3639, 285.125, 285.6754, 285.7412, 284.711, 284.0826, 283.6668, 
    284.2738, 284.3317, 284.0538, 284.2059, 284.1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ;

           Is this a bug?  You know when use 'real.exe' to prepare IC and BC, there are errors with TSK unreasonable problem.  

Thanks in advance?