Re: Is any function to calculate thermal wind?

My mailer screwed up the formatting ...

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No, but it should be easy to develop a function.

EG: If the data are on constant pressure surfaces and

the data are on a regular [fixed] global grid [eg: 2.5],

and the shear of the geostrophic wind is desired:

  T_grad_lon = T ; create arrays to hold output,

                                ; same size and type as input

  T_grad_lat = T

                                ; this procedure will overwrite

                                ; values in T_grad_lon and T_grad_lat

  *gradsf* (T, T_grad_lon, T_grad_lat)

  T_grad_lon_at_long_name = "longitudinal gradient (derivative)"

  T_grad_lat_at_long_name = "latitudinal gradient (derivative)"

    dudz = (-g/(f*T))*T_grad_lat ; constant pressure levels

   dudy = ( g/(f*T))*T_grad_lon

On a gaussian grid use 'gradsg'

===

If the data are on a limited area grid, use 'center_finite_diff'

to perform the gradient calculations.

Good luck

Dennis Shea wrote:
> No, but it should be easy to develop a function.
> EG: If the data are on constant pressure surfaces and
> the data are on a regular [fixed] global grid [eg: 2.5],
> and the shear of the geostrophic wind is desired:
>
> T_grad_lon = T ; create arrays to hold output,
> ; same size and type as input
> T_grad_lat = T ; this
> procedure will overwrite
> ; values in T_grad_lon and T_grad_lat
> *gradsf* (T, T_grad_lon, T_grad_lat)
> T_grad_lon_at_long_name = "longitudinal gradient (derivative)"
> T_grad_lat_at_long_name = "latitudinal gradient (derivative)"
>
> dudz = (-g/(f*T))*T_grad_lat ; constant pressure levels
> dudy = ( g/(f*T))*T_grad_lon
>
> On a gaussian grid use 'gradsg'
>
> ===
> If the data are on a limited area grid, use 'center_finite_diff'
> to perfom the grqadient calculations.
>
> Good luck
>
>
>
>
>>
>> Is there any function to calculate thermal wind in NCL? Thanks!
>>
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk_at_ucar.edu
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk

-- 
======================================================
Dennis J. Shea                  tel: 303-497-1361    |
P.O. Box 3000                   fax: 303-497-1333    |
Climate Analysis Section                             |
Climate & Global Dynamics Div.                       |
National Center for Atmospheric Research             |
Boulder, CO  80307                                   |
USA                        email: shea 'at' ucar.edu |
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