Re: tips to unstagger data from WRF

At what level are you looking for U/V winds? If you're looking at the
surface, and using ARW, the surface U/V data are Arakawa-A grid, or,
destaggered.

gerry

jimmyc_at_iastate.edu wrote:
> Hi Erik-
> It appears you can use the functions for WRF:
> wrf_user_getvar to get unstaggered wind vector components
>
> But it also looks like you need to use wrf_uvmet to get those components
> to Earth relative coordinates.
>
> I havent tried this yet but I need to. Any advice out there?
> jimmyc
>
> On Mon, 10 Dec 2007, Erik Noble wrote:
>
>> Hi. I am looking at U an V variables from WRF output data. if you look
>> at the Lat and lon attributes of the following 2 variables, you'll
>> notice that they are "staggered";
>>
>> float U(Time, bottom_top, south_north, west_east_stag) ;
>> U:FieldType = 104 ;
>> U:MemoryOrder = "XYZ" ;
>> U:description = "x-wind component" ;
>> U:units = "m s-1" ;
>> U:stagger = "X" ;
>> U:coordinates = "XLONG_U XLAT_U" ;
>> float V(Time, bottom_top, south_north_stag, west_east) ;
>> V:FieldType = 104 ;
>> V:MemoryOrder = "XYZ" ;
>> V:description = "y-wind component" ;
>> V:units = "m s-1" ;
>> V:stagger = "Y" ;
>> V:coordinates = "XLONG_V XLAT_V" ;
>>
>> The WRF is on a Akarawa C-Grid. If I want to "unstagger" the data so
>> that I can compare the data to other data st regular lat and lon
>> ponts, does anyone have a suggestion on how to do thi in NCL?
>> Thank you,
>> Erik Noble
>> _______________________________________________
>> ncl-talk mailing list
>> ncl-talk_at_ucar.edu
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>

-- 
Gerry Creager -- gerry.creager_at_tamu.edu
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