[ncarg-talk] Sigma to Pressure levels

[Mary Haley]

Akhilesh,

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--Mary


On Tue, Jan 26, 2016 at 6:39 PM, Akhilesh Mishra <akmishra123 at gmail.com>
wrote:

> Dear NCL/NCARg Community,
> I have sigma level  temperature, specific humidity, and zonal and
> meridional wind components along with surface pressure. I wish to
> interpolate this data on prescribed pressure (standard 17) levels. I am
> using  NCL's vinth2p function  as
>
>  uap = vinth2p(ua_01,hyam,hybm,plevs,ps_01,1,1000,1,True)
>
> where uap = Zonal wind at pressure level
>           ua_01 = Zonal wind at sigma level
>           ps_01 = Surface pressure in hPa
>           plevs = (/10,20, 30, 50, 70, 100, 150, 200 \
>     , 250, 300, 400, 500, 600, 700, 850, 925, 1000/)*1.0
>          hyam = fspan(0.,0.,18)
>          hybm = sigma
>
> My results look fine over most parts of ocean, however, over land values
> are too high for 1000hPa zonal winds, especially over the mountaineous
> regions with low surface pressure, which is expected but How can I get that
> fixed while interpolating, I have used last argument of vinth2p function
> TRUE and FALSE both, but no improvement.
> I am attaching two picture files one showing surface pressure and other
> depicting zonal wind at 1000 hPa interpolated using above function.
> Any help/suggestion is greatly appreciated.
> Many Thanks
> Best
>
> Akhilesh
> Center for Ocean-Atmospheric Prediction Studies
> The Florida State University
> 2000 Levy Av, Building A, Room 252
> Tallahassee FL 32310
> Phone:  (850) 645-0665
> Fax: (850) 644-4841
> http://coaps.fsu.edu/akhilesh-mishra <http://coaps.fsu.edu/akhilesh-mishra
> >
>
>
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