IPCC DDC  Variable List
Num Name     Unit    Explanation
  1 PRES   Pa        Pressure
  2 MSLP   Pa        Pressure reduced to MSL
  7 HGT    gpm       Geopotential height
 11 TMP    K         Temperature
 15 TMAX   K         Maximum temperature
 16 TMIN   K         Minimum temperature
 32 WIND   m/s       Windspeed
 33 UGRD   m/s       u wind
 34 VGRD   m/s       v wind
 43 RELV   1/s        Relative vorticity
 44 RELD   1/s        Relative divergence
 51 SPFH   kg/kg     Specific humidity
 52 RELH   %          Relative humidity
 59 PRATE  kg/m**2/s Precipitation rate
 61 PREC   kg/m**2   Total Precipitation
 65 WEASD  kg/m**2   Water equiv. of accum. snow depth
 71 TCDC   perc.     Total cloud cover
 81 LAND   integer   Land-sea mask (1=land; 0=sea)
 83 SFCR   m         Surface roughness
 90 RUNOF  kg/m**2   Runoff
 91 ICEC   1/0       Ice concentration (ice=1; no ice=0)
111 NSWFG  W/m**2    Net short wave flux at the surface
116 DSWF   W/m**2    Downward short wave flux
121 LHTFL  W/m**2    Latent heat flux
122 SHTFL  W/m**2    Sensible heat flux
124 UFLX   N/m**2    Zonal component of momentum flux
125 VFLX   N/m**2    Meridional component of momentum flux
144 SOILW  frac.     Volumetric soil moisture content
145 PEVPR  w/m**/    Potential evaporation rate
146 CWORK  J/Kg      Cloud work function
147 UGWD   N/m**2    Zonal gravity wave stress
148 VGWD   N/m**2    Meridional gravity wave stress
155 GFLUX  W/m**2    Ground heat flux
160 CSUSF  W/m**2    Clear sky upward solar flux
161 CSDSF  W/m**2    Clear sky downward solar flux
162 CSULF  W/m**2    Clear sky upward long wave flux
163 CSDLF  W/m**2    Clear sky downward long wave flux
164 CFNSF  W/m**2    Cloud forcing net solar flux
165 CFNLF  W/m**2    Cloud forcing net long wave flux
166 VBDSF  W/m**2    Visible beam downward solar flux
167 VDDSF  W/m**2    Visible diffuse downward solar flux
168 NBDSF  W/m**2    Near IR beam downward solar flux
169 NDDSF  W/m**2    Near IR diffuse downward solar flux
175 SGLYR  integer   Nearby model level
181 LPSX   1/m       x-gradient of log pressure
182 LPSY   1/m       y-gradient of log pressure
183 HGTX   m/m       x-gradient of height
184 HGTY   m/m       y-gradient of height
204 DSWRF  W/m**2    Downward solar radiation flux
205 DLWRF  W/m**2    Downward long wave radiation flux
211 USWRF  W/m**2    Upward solar radiation flux
212 ULWRF  W/m**2    Upward long wave radiation flux
214 CPRAT  kg/m**2/s Convective precipitation rate