[gradsusr] Constant field. Value = 0
krishnamohan
krishmet at gmail.com
Fri Jun 18 00:27:29 EDT 2010
Hai Wendell,
I'm a WRF** newbie. As far as i know, the first time step
in the model output will be the input data you are providing. All the other
variables than those on the Input file is calculated by the model during the
integration (for example precipitation). Check your input grb data (GFS of
FNL). There you cannot find this variable. So if you want to get latent
heat, you will get it from the second time step onwards. Try
'set t 2 last'
'd lh'
will give you the entire flux. Hope somebody may come forward with a better
explanation
regards
Krishnamohan
--
Krishnamohan.K.S
Junior Research Fellow
Department Of Atmospheric Sciences
Cochin University of Science and Technology
Cochin,India
On Fri, Jun 18, 2010 at 6:41 AM, Wendell Farias <wendellrgf at yahoo.com.br>wrote:
> Dear users,
>
> I'm using WRF model and ARWpost to create output in Grads. I have interest
> in some variables how LATENT HEAT FLUX AT THE SURFACE (W m-2), but the
> result showed by Grads is: "Constant field. Value = 0". Somebody knows what
> is happend? Below I put the description of the variables of ctl.
>
>
> ---------------------------------------------------------------------------------------------------------------
> tdef 10 linear 12Z17MAY2010 60MN
> VARS 123
> LU_INDEX 1 0 LAND USE CATEGORY (-)
> U 19 0 x-wind component (m s-1)
> V 19 0 y-wind component (m s-1)
> W 19 0 z-wind component (m s-1)
> PH 19 0 perturbation geopotential (m2 s-2)
> PHB 19 0 base-state geopotential (m2 s-2)
> T 19 0 perturbation potential temperature (theta-t0) (K)
> MU 1 0 perturbation dry air mass in column (Pa)
> MUB 1 0 base state dry air mass in column (Pa)
> NEST_POS 1 0 NEST_POS (-)
> P 19 0 perturbation pressure (Pa)
> PB 19 0 BASE STATE PRESSURE (Pa)
> SR 1 0 fraction of frozen precipitation (-)
> POTEVP 1 0 accumulated potential evaporation (W m-2)
> SNOPCX 1 0 snow phase change heat flux (W m-2)
> SOILTB 1 0 bottom soil temperature (K)
> Q2 1 0 QV at 2 M (kg kg-1)
> T2 1 0 TEMP at 2 M (K)
> TH2 1 0 POT TEMP at 2 M (K)
> PSFC 1 0 SFC PRESSURE (Pa)
> U10 1 0 U at 10 M (m s-1)
> V10 1 0 V at 10 M (m s-1)
> QVAPOR 19 0 Water vapor mixing ratio (kg kg-1)
> QCLOUD 19 0 Cloud water mixing ratio (kg kg-1)
> QRAIN 19 0 Rain water mixing ratio (kg kg-1)
> LANDMASK 1 0 LAND MASK (1 FOR LAND, 0 FOR WATER) (-)
> TSLB 5 0 SOIL TEMPERATURE (K)
> SMOIS 5 0 SOIL MOISTURE (m3 m-3)
> SH2O 5 0 SOIL LIQUID WATER (m3 m-3)
> SEAICE 1 0 SEA ICE FLAG (-)
> XICEM 1 0 SEA ICE FLAG (PREVIOUS STEP) (-)
> SFROFF 1 0 SURFACE RUNOFF (mm)
> UDROFF 1 0 UNDERGROUND RUNOFF (mm)
> IVGTYP 1 0 DOMINANT VEGETATION CATEGORY (-)
> ISLTYP 1 0 DOMINANT SOIL CATEGORY (-)
> VEGFRA 1 0 VEGETATION FRACTION (-)
> GRDFLX 1 0 GROUND HEAT FLUX (W m-2)
> ACGRDFLX 1 0 ACCUMULATED GROUND HEAT FLUX (J m-2)
> SNOW 1 0 SNOW WATER EQUIVALENT (kg m-2)
> SNOWH 1 0 PHYSICAL SNOW DEPTH (m)
> RHOSN 1 0 SNOW DENSITY (kg m-3)
> CANWAT 1 0 CANOPY WATER (kg m-2)
> SST 1 0 SEA SURFACE TEMPERATURE (K)
> SSTSK 1 0 SKIN SEA SURFACE TEMPERATURE (K)
> LAI 1 0 Leaf area index (area/area)
> Z0 1 0 Background ROUGHNESS LENGTH (m)
> VAR 1 0 OROGRAPHIC VARIANCE (-)
> CON 1 0 OROGRAPHIC CONVEXITY (-)
> OA1 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)
> OA2 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)
> OA3 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)
> OA4 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)
> OL1 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)
> OL2 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)
> OL3 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)
> OL4 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)
> MAPFAC_M 1 0 Map scale factor on mass grid (-)
> MAPFAC_MX 1 0 Map scale factor on mass grid, x direction (-)
> MAPFAC_MY 1 0 Map scale factor on mass grid, y direction (-)
> MF_VX_INV 1 0 Inverse map scale factor on v-grid, x direction (-)
> F 1 0 Coriolis sine latitude term (s-1)
> E 1 0 Coriolis cosine latitude term (s-1)
> SINALPHA 1 0 Local sine of map rotation (-)
> COSALPHA 1 0 Local cosine of map rotation (-)
> HGT 1 0 Terrain Height (m)
> HGT_SHAD 1 0 Height of orographic shadow (m)
> TSK 1 0 SURFACE SKIN TEMPERATURE (K)
> RAINC 1 0 ACCUMULATED TOTAL CUMULUS PRECIPITATION (mm)
> RAINNC 1 0 ACCUMULATED TOTAL GRID SCALE PRECIPITATION (mm)
> I_RAINC 1 0 BUCKET FOR RAINC (-)
> I_RAINNC 1 0 BUCKET FOR RAINNC (-)
> SNOWNC 1 0 ACCUMULATED TOTAL GRID SCALE SNOW AND ICE (mm)
> GRAUPELNC 1 0 ACCUMULATED TOTAL GRID SCALE GRAUPEL (mm)
> EDT_OUT 1 0 EDT FROM GD SCHEME (-)
> SWDOWN 1 0 DOWNWARD SHORT WAVE FLUX AT GROUND SURFACE (W m-2)
> GLW 1 0 DOWNWARD LONG WAVE FLUX AT GROUND SURFACE (W m-2)
> OLR 1 0 TOA OUTGOING LONG WAVE (W m-2)
> XLAT 1 0 LATITUDE, SOUTH IS NEGATIVE (degree_north)
> XLONG 1 0 LONGITUDE, WEST IS NEGATIVE (degree_east)
> ALBEDO 1 0 ALBEDO (-)
> ALBBCK 1 0 BACKGROUND ALBEDO (-)
> EMISS 1 0 SURFACE EMISSIVITY (-)
> NOAHRES 1 0 RESIDUAL OF THE NOAH SURFACE ENERGY BUDGET (W m{-2})
> TMN 1 0 SOIL TEMPERATURE AT LOWER BOUNDARY (K)
> XLAND 1 0 LAND MASK (1 FOR LAND, 2 FOR WATER) (-)
> UST 1 0 U* IN SIMILARITY THEORY (m s-1)
> PBLH 1 0 PBL HEIGHT (m)
> HFX 1 0 UPWARD HEAT FLUX AT THE SURFACE (W m-2)
> QFX 1 0 UPWARD MOISTURE FLUX AT THE SURFACE (kg m-2 s-1)
> LH 1 0 LATENT HEAT FLUX AT THE SURFACE (W m-2)
> ACHFX 1 0 ACCUMULATED UPWARD HEAT FLUX AT THE SURFACE (J m-2)
> ACLHF 1 0 ACCUMULATED UPWARD LATENT HEAT FLUX AT THE SURFACE (J
> m-2)
> SNOWC 1 0 FLAG INDICATING SNOW COVERAGE (1 FOR SNOW COVER) (-)
> pressure 19 0 Model pressure (hPa)
> geopt 19 0 Geopotential (m2/s2)
> height 19 0 Model height (km)
> tk 19 0 Temperature (K)
> tc 19 0 Temperature (C)
> theta 19 0 Potential Temperature (K)
> td 19 0 Dewpoint Temperature (C)
> td2 1 0 Dewpoint Temperature at 2m (C)
> rh 19 0 Relative Humidity (%)
> clflo 1 0 Low Cloud Fraction (%)
> clfmi 1 0 Mid Cloud Fraction (%)
> clfhi 1 0 High Cloud Fraction (%)
> rh2 1 0 Relative Humidity at 2m (%)
> wspd 19 0 Wind Speed (m s-1)
> wdir 19 0 Wind Direction (Degrees)
> ws10 1 0 Wind Speed at 10 M (m s-1)
> wd10 1 0 Wind Direction at 10 M (Degrees)
> umet 19 0 Rotated wind component (m s-1)
> vmet 19 0 Rotated wind component (m s-1)
> u10m 1 0 Rotated wind component (m s-1)
> v10m 1 0 Rotated wind component (m s-1)
> slp 1 0 Sea Levelp Pressure (hPa)
> dbz 19 0 Reflectivity (-)
> max_dbz 1 0 Max Reflectivity (-)
> cape 19 0 CAPE (J/kg)
> cin 19 0 CIN (J/kg)
> mcape 1 0 MCAPE (J/kg)
> mcin 1 0 MCIN (J/kg)
> lcl 1 0 LCL (meters AGL)
> lfc 1 0 LFC (meters AGL)
>
> --------------------------------------------------------------------------------------------------------------------
>
> Thank you advanced.
>
>
>
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://gradsusr.org/pipermail/gradsusr/attachments/20100618/342978a9/attachment-0003.html
More information about the gradsusr
mailing list