Re: tips to unstagger data from WRF

I am trying to look at 700 mb winds. Correct me if I am wrong but to do this
brings in an extra step of interpolating to pressure level using WRF-NCL
code.
So first I have to interpolate the data usingthe wrf_interp-3d function and
then use the " wrf_uvmet" function?
-Erik

On 12/10/07 6:33 PM, "Gerry Creager" <gerry.creager_at_tamu.edu> wrote:

> 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
>>>
>>

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Received on Mon Dec 10 2007 - 16:46:43 MST