[gradsusr] Res: Constant field. Value = 0

Wendell Farias wendellrgf at yahoo.com.br
Fri Jun 18 05:35:33 EDT 2010


Hi Krishnamohan,

You're right, I checked what you said, the latent heat begins from second time, as well as others input variables. 

Thank you,
Wendell




________________________________
De: krishnamohan <krishmet at gmail.com>
Para: GrADS Users Forum <gradsusr at gradsusr.org>; wendellrgf at yahoo.com.br
Enviadas: Sexta-feira, 18 de Junho de 2010 1:27:29
Assunto: Re: [gradsusr] Constant field. Value = 0

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.
> 
>
>>
>
>
>       
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>>gradsusr mailing list
>gradsusr at gradsusr.org
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>


      
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