[ncl-talk] 91 model levels

[Dennis Shea]

vinth2p uses one definition (Community Atmosphere Model) for hybrid levels.
Specifically:

       *p = a(k)*p0 + b(k)*ps*.

ECMWF uses another:

       *p = ap(k) + **b(k)*ps    where    [ap(k)=a(k)*p0]*

JMA (Japanese Meteorological Agency) uses a third method

      p(k) = *exp*
<http://www.ncl.ucar.edu/Document/Functions/Built-in/exp.shtml>(
(1/dp(k))*(p(k-0.5)**log*
<http://www.ncl.ucar.edu/Document/Functions/Built-in/log.shtml>(p(k-0.5)) -
p(k+0.5)**log*
<http://www.ncl.ucar.edu/Document/Functions/Built-in/log.shtml>
(p(k+0.5))-1.0))

where the p(k-05) and p(k+0.5) represent the interface coefficients.

Hence, different coefficients. Try

http://www.ncl.ucar.edu/Document/Functions/Built-in/vinth2p_ecmwf.shtml




On Sat, Apr 23, 2016 at 11:41 PM, WIND <954051157 at qq.com> wrote:

> Hi all,
> I am trying to analyze the ERA-20C temperature tendency due to physics data.
> My version is 6.2.1, now I have some doubts about the model levels. The
> website
> http://www.ecmwf.int/en/forecasts/documentation-and-support/60-model-levels
>  gives the definations of  91 model levels. Should I use the *vinth2p *or
> other ways to transform from model data to pressure data?
> Look forward to your suggestions. Any help would be appreciated.
> Sincerely,
> Yan
>
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