[ncl-talk] Unstaggered to staggered

[Dennis Shea]

ESMF Regridding:   *http://www.ncl.ucar.edu/Applications/ESMF.shtml*
<http://www.ncl.ucar.edu/Applications/ESMF.shtml>

Likely, you have

Source grid:
   LAT[*], LON[*]

Destination (staggard) grids

XLONG_U[*][*],  XLAT_U[*][*]  [Note:   if 3D; xlatu = f->XLAT_U(0,:,:)

XLONG_V[*][*],  XLAT_V[*][*]

You will have to create separate U and V scripts.

The WRF grid is similar to the NARR grid: curvilinear

See:  ESMF_wgts_30.ncl
<http://www.ncl.ucar.edu/Applications/Scripts/ESMF_wgts_30.ncl>

ESMF_29 also

====

Note that when zonal and meridional winds are interpolated to a new
location, they (technically) should be done together. Actually, *any*
vector pair  must be rotated together. However, almost all interpolation
methods ignore this. Something like,

   uNew = u*cos(rot) - v*sin(rot)
   vNew = u*sin(rot) + v*cos(rot)

Of course, you must provide the rotation angle (rot)
===
Good Luck


On Mon, Feb 11, 2019 at 9:52 PM Babitha George <babigeorge27 at gmail.com>
wrote:

> Hai,
>
> Is it possible to convert wind components from unstaggered grid to
> staggered grid in NCL? I know the reverse is possible using
> wrf_user_unstagger.
>
> In wanted to perturb the wind components in an analysis file and run the
> WRF model using that analysis.
>
> Can someone please help me in this?
>
> Thank you
> Babitha
>
> Babitha George
> Research Scholar
> Indian Institute of Space Science and Technology
> Thiruvananthapuram, Kerala
>
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