[Wrf-users] Queries about sharp discontinuity of HydrologicalVariables

Feng Liu fliu at mag.maricopa.gov
Tue Aug 3 17:07:33 MDT 2010

Hi, Kamal,
The sharp gradient for those variables may be resulted from impropriate
resolution or interpolation algorithm to process static geogrid data,
for example land use category and soil type. Please check namelist for
running WPS, try to use high resolution data through
geog_data_res='30s', '30s','30s' in namelist.wps,  and interpolation
option in GEOGRID.TBL for soil type and land use category should be
"nearest_neighbor "  and " four_pt", respectively.  
BTW, I wonder if you are using USGS land use data. For your high
resolution domain d03, I think default USGS land use data downloaded
from WRF -related website is too outdated. MODIS data may be better. 
Hope that is helpful.

-----Original Message-----
From: wrf-users-bounces at ucar.edu [mailto:wrf-users-bounces at ucar.edu] On
Behalf Of mmkamal at sciborg.uwaterloo.ca
Sent: Tuesday, August 03, 2010 9:46 AM
To: wrf-users at ucar.edu
Subject: [Wrf-users] Queries about sharp discontinuity of

Dear All,

I ran WRF 3.1.1 for 15 days hind cast simulation with coarse grid
horizontal resolution 8km over the domain North-east North America. I
have used 3 nesting. When I tried to visualize the output I found a very
sharp discontinuity in the Hydrological variable (e.g. Surface &
Underground Runoff, Soil moisture & QV. I have used "R" and GrADS for
visualization. I am attaching some PNG Image file of the Output

Would anybody can help me to overcome this problem.

Thanks in advance

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