Re: Problem in converting CCSM hybrid data to pressure levels ...

From: Ufuk Utku Turuncoglu <turuncu_at_nyahnyahspammersnyahnyah>
Date: Fri, 24 Oct 2008 15:58:49 +0200

Hi Dennis,

The problem same for both case when i set the extrapolation option as
True and False. I have problem in all interpolated vertical layer. In
my case i will interpolate the hybrid to 18 pressure level. I check all
of them but the results same.

Thanks for your help,

--ufuk

Dennis Shea wrote:
> Merhaba Ufuk
>
> The "vinth2p*" functions are directly out of
> the old CCM Processor. No changes.
>
> In a separate email I will send you the code.
>
> It is not clear from the message below, but are you
> talking about values that have been extrapolated?
> [Your last argument is "True"]. I never use
> extrapolation. For winds, the vinth2p* codes just
> use the value at the lowest 'valid' level.
>
>
>
> D
>
>
>
> Ufuk Utku Turuncoglu wrote:
>> Hi,
>>
>> I try to modify RegCM3 ICBC code to handle CCSM hybrid coordinate
>> data. So, i create ic/bc files using modified code and run model
>> using CCSM data (b30.030e.cam2) for a five year period. After
>> investigation and comparing results, i realize that the precipitation
>> pattern is not similar with observations.
>>
>> To check the results, i convert the raw CCSM data using both
>> modified version of the RegCM3 ICBC code and NCL (using vinth2p_ecmwf
>> and vinth2p). The results is not good in my case. When i compare the
>> results with the NCEP/NCAR Reanalysis data (from CDC), u and v
>> component of the wind is not similar with observations in NCL and
>> modified ICBC converted case. I use the following commands to convert
>> the hybrid levels,
>>
>> UonP = vinth2p(U(tt,:,:,:),hyam,hybm,pnew,PS(tt,:,:),1,P0mb,1,True)
>> VonP = vinth2p(V(tt,:,:,:),hyam,hybm,pnew,PS(tt,:,:),3,P0mb,1,True)
>>
>> and also i try different interpolation types (lineer, log etc.) and
>> vinth2p_ecmwf function but the results is similar.
>>
>> Is there anybody who faced this kind of problem? I also want to study
>> the NCL vinth2p_ecmwf and vinth2p source codes. Where is the places
>> of these functions in the source tar file?
>>
>> PS: If you want to see the NCL script, please let me know.
>>
>> Any help will be helpful for me.
>> Best regards,
>>
>> Ufuk Turuncoglu
>> ITU, Informatics Institute
>>
>>
>

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Received on Fri Oct 24 2008 - 07:58:49 MDT

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