[Wrf-users] Namelist options

anil rohilla anilrohilla at gmail.com
Fri Aug 4 14:08:51 MDT 2006


Hi all,
        I was trying to run a nested case using WRFV2. My domain dx
.dy was 45000 and 15000 for outer and nest domain. when i  was running
the wrf.exe  ,bychance i put dx,dy 1500 instead of 15000 FOR nest
domain and parent grid ratio was 3:1 , but actualy it becomes 30:1,
Model was running succesfully without any segmentation fault. But when
i ploted the outer grid ,everything was ok ,All the variables i got,
but when i checked the nested domain at first time steps ,it was
giving NAN values. This is just for the information only.

regards
anil kumar rohilla


On 8/4/06, wrf-users-request at ucar.edu <wrf-users-request at ucar.edu> wrote:
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> Today's Topics:
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>    1. terrain-following geopotential height problem at t=0
>       (Case, Jonathan)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 4 Aug 2006 11:19:35 -0500
> From: "Case, Jonathan" <Jonathan.Case at nsstc.nasa.gov>
> Subject: [Wrf-users] terrain-following geopotential height problem at
>         t=0
> To: <wrf-users at ucar.edu>
> Message-ID:
>         <90F5BBA71B8B2840877328A13B80661F4DDECA at NSSTCEX1.nsstc.nasa.gov>
> Content-Type: text/plain; charset="us-ascii"
>
> To wrf-users,
>
> During the course of setting up a trial domain and examining the output,
> our team has noticed a distinct terrain-following pattern in the
> initialization geopotential height data.  We have eliminated
> post-processing as a possible problem since the strange pattern
> disappears shortly after the WRF initialization. The geopotential height
> is the only variable we have noticed such a terrain-following pattern.
>
> I have attached images of the 0-hour and 3-hour 850-mb height fields at
> 5-m contour intervals from a 0000 UTC 31 July 2006 initialization off of
> the 1-deg GFS model, as well as the wrfsi.nl file.  I ran this
> particular simulation at 4-km horizontal grid spacing.  As you can see,
> river valleys are showing up in the interpolated height field, even
> where the terrain is only mildly sloping in AL and MS.  The height field
> looks especially strange over Cuba and surrounding islands where there
> is sharply sloping terrain.  The 3-hour forecast shows no such
> terrain-following pattern.  The problem seems to be most severe when the
> horizontal pressure (height) gradient is weak.
>
> Has anyone encountered this problem with WRFSI initialization height
> fields?  If so, could someone provide us with some guidance or possibly
> a code fix?
>
> Thanks much,
> Jonathan Case
>
> *******************************************
> Jonathan Case, ENSCO, Inc.
> Aerospace Sciences & Engineering Division
> Short-term Prediction Research and Transition Center
> 320 Sparkman Dr. NW, Room 3062
> Huntsville, AL 35805-1912
> Voice: (256) 961-7504   Fax: (256) 961-7788
> Emails: Jonathan.Case at nsstc.nasa.gov
>            case.jonathan at ensco.com
> *******************************************
>
>
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> &project_id
>  SIMULATION_NAME = 'MAP06 Model Simulation v2.1.2'
>  USER_DESC = 'MAP06 Modeling Group'
> /
> &filetimespec
>  START_YEAR = 2006,
>  START_MONTH = 07,
>  START_DAY = 31,
>  START_HOUR = 00,
>  START_MINUTE = 00,
>  START_SECOND = 00,
>  END_YEAR = 2006,
>  END_MONTH = 08,
>  END_DAY = 01,
>  END_HOUR = 00,
>  END_MINUTE = 00,
>  END_SECOND = 00,
>  INTERVAL = 10800,
> /
> &hgridspec
>  NUM_DOMAINS = 1
>  XDIM = 500,
>  YDIM = 500,
>  PARENT_ID = 1,1,
>  RATIO_TO_PARENT = 1,3,
>  DOMAIN_ORIGIN_LLI = 1,56,
>  DOMAIN_ORIGIN_LLJ = 1,30,
>  DOMAIN_ORIGIN_URI = 500,80,
>  DOMAIN_ORIGIN_URJ = 500,54,
>  MAP_PROJ_NAME = 'lambert',
>  MOAD_KNOWN_LAT = 28.5,
>  MOAD_KNOWN_LON = -81.5,
>  MOAD_STAND_LATS = 28.5, 28.5,
>  MOAD_STAND_LONS = -81.5
>  MOAD_DELTA_X = 4000.
>  MOAD_DELTA_Y = 4000.
>  SILAVWT_PARM_WRF = 0.
>  TOPTWVL_PARM_WRF = 2.
> /
> &sfcfiles
>  TOPO_30S = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/topo_30s',
>  LANDUSE_30S = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/landuse_30s',
>  SOILTYPE_TOP_30S = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/soiltype_top_30s',
>  SOILTYPE_BOT_30S = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/soiltype_bot_30s',
>  GREENFRAC = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/greenfrac',
>  SOILTEMP_1DEG = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/soiltemp_1deg',
>  ALBEDO_NCEP = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/albedo_ncep',
>  MAXSNOWALB = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/maxsnowalb',
>  ISLOPE = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/geog/islope',
> /
> &interp_control
>  NUM_ACTIVE_SUBNESTS = 0,
>  ACTIVE_SUBNESTS = 2,3,4,
>  PTOP_PA = 10000,
>  HINTERP_METHOD = 1,
>  LSM_HINTERP_METHOD = 1,
>  NUM_INIT_TIMES = 1,
>  INIT_ROOT = 'GFS',
>  LBC_ROOT = 'GFS',
>  LSM_ROOT = '',
>  CONSTANTS_FULL_NAME = '',
>  VERBOSE_LOG = .true.,
>  OUTPUT_COORD = 'ETAP',
>  LEVELS = 1.00,0.99,0.98,0.97,0.96,0.95,
>                   0.94,0.93,0.92,0.91,0.90,0.89,
>                   0.88,0.87,0.86,0.85,0.84,0.83,
>                   0.82,0.81,0.80,0.78,0.76,0.74,
>                   0.72,0.70,0.68,0.66,0.64,0.62,
>                   0.60,0.57,0.54,0.51,0.48,0.45,
>                   0.42,0.39,0.36,0.33,0.30,0.27,
>                   0.24,0.21,0.18,0.15,0.12,0.09,
>                   0.06,0.03,0.00,
> /
> &si_paths
>  ANALPATH = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/extprd',
>  LBCPATH = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/extprd',
>  LSMPATH = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/extprd',
>  CONSTANTS_PATH = '/nobackup/jonc/wrfdoms/wrfv2.1.2/global_data/extprd',
> /
>
> ------------------------------
>
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>
> End of Wrf-users Digest, Vol 24, Issue 3
> ****************************************
>


-- 
ANIL KUMAR ROHILLA
Meteorologist
Long Range Forecasting  Section
NATIONAL CLIMATE CENTER
O/o ADGM(Research)
India Meteorological Department
Shivaji Nagar
 PUNE-411005.
 INDIA
Mobile: 09422023277



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