[Wrf-users] About dx and dy using lat-lon

[Robert Schuster]

Dear all,

thank you for your useful comments! My problem is now solved by using
the DX and DY values calculated by metgrid in the namelist.input.

It would be a good idea to update the manual on this point.

> Jatin Kala <mailto:jatin.kala.jk at gmail.com>
> 14. November 2013 21:56
> Do an ncdump -h of any met_em file, and you should get the dx and dy
> in m which u can specify in namelist.input. We had the same problem
> when uding rotated lat-lon grid
>
> Sent from my iPhone
>
> Robert Schuster <mailto:rxschuster at gmail.com>
> 14. November 2013 18:26
> Dear WRF users,
>
> I have the same problem as already described below. I configured WRF
> with a regional "lat-lon" domain. My grid spacing is 0.081 degrees in
> each direction. The WPS tools accept dx and dy in degrees (as described
> in the user guide), but real.exe complains about a mismatch between the
> dx/dy from namilist.input and the values stored by metgrid in the
> met_em....nc files.
>
> How to solve this problem? Is a solution to place the metgrid calculated
> dx/dy in meters in namelist.input? Is it better to store dx/dy in the
> metgrid produced files in degrees (for example by editing the attributes
> with ncatted)? Are there any side effects of these solutions?
>
> Best Regards,
> Robert Schuster
>
> Output from real.exe (Version 3.5.1):
> dx and dy from file 9005.376 9005.376
> dx and dy from namelist 8.1000000E-02 8.1000000E-02
> -------------- FATAL CALLED ---------------
> FATAL CALLED FROM FILE: <stdin> LINE: 531
> DX and DY do not match comparing namelist to the input file
> -------------------------------------------
>
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