[ncl-talk] Vertical interpolation

[Dennis Shea]

"I found the function *vinth2p_ecmwf* very useful for my purpose, but I am
a bit puzzled if it is right to use it with all the models.:

The difference between  *vinth2p*  and *vinth2p_ecmwf *

is that the latter uses "an ECMWF formulation to extrapolate values below
ground."

If the pressures at hybrid levels are computed using the dimensionless
coefficients (A, B):

             p(k) = A(k)*PO + B(k)*PS

then yes.
====
Some models output a hybrid component, *Ap(k) [=A(k)*p0]*, which has units
of pressure. This must be made dimensionless *prior* to use.




On Fri, Sep 3, 2021 at 2:20 AM markus mingel via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear All,
>
> I would convert CMIP6 models from hybrid coordinates to pressure levels. I
> found the function *vinth2p_ecmwf* very useful for my purpose, but I am a
> bit puzzled if it is right using it with all the models. In fact, the
> description of the function reports: "*Interpolates CESM hybrid
> coordinates to pressure coordinates*", so I do not know if it works with
> all models (except CESM) even if they are in hybrid coordinates.
>
> Any clarification is welcome,
>
> Best Regards,
>
> Markus
>
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