Re: question about wrf_user_getvar

Hi-
 ua and va are U and V mapped from the C grid staggering to the mass points.
However, requesting ³U² and ³V² should work but they will have dimensions
(nz,ny,nx+1) and (nz,ny+1,nx) relative to the ua and va which are
dimensioned (nz,ny,nx) where nx and ny are the number of grid points in each
x and y direction.

If the variable requested in quotations does not match the calculated
quantities, it looks for them within the netcdf file.

Can you define ³Does not work²? What is the error message specifically?
jimmyc

On 3/18/09 6:46 AM, "Mary Haley" <haley_at_ucar.edu> wrote:

>
> Hi,
>
> Please see:
>
> http://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_getvar.shtml
>
> for a list of quantities that you can retrieve using wrf_user_getvar. "U" and
> "V" are not in this list.
>
> If you are just trying to get U and V off the file, you can do this directly:
>
> U = a->U
> V = a->V
>
> --Mary
>
> On Mar 18, 2009, at 5:42 AM, yinjinfang88 wrote:
>
>>
>>
>> Hi ,
>>
>> I am confused when I try to plot with wrfout(a example data
>> from wrf website :wrfout_d01_2000-01-24_12.nc ) .
>> I want to get some variables via function "wrf_user_getvar()" as
>> fellow,
>> u = wrf_user_getvar(a,"ua",it) ; u averaged to mass points
>> v = wrf_user_getvar(a,"va",it) ; v averaged to mass points
>>
>> It works well. But I can't find any variable called "ua" and
>> "va" in this file by "" ncdump -h wrfout_d01_2000-01-24_12.nc ".
>>
>> Only to find two variables called "U" and "V". So I try to
>> use
>>
>> u = wrf_user_getvar(a,"U",it) ; u averaged to mass points
>> v = wrf_user_getvar(a,"V",it) ; v averaged to mass points
>>
>>
>> to get "U" and "V".
>>
>> It dose not work . There is a error saying that "U" is not
>> a variable.
>>
>> Thanks for any suggestion!
>> 2009-03-18
>>
>> yinjinfang88
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>
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Received on Wed Mar 18 2009 - 08:21:25 MDT