[RegCNET] mismatch in averaging!

[Moetasim Ashfaq]

Hi,

Why Diurnal avg and Continuous daily avg should give you same results?

In postproc, we consider daily average of tmax (tmin) as the max (min)  
of all daily time-steps not the average of them. Similarly, 5-day mean  
will be calculated after calculating daily max (min) for each day and  
then averaging that from day1 to day5 and so on. Only in the case of  
diurnal cycle, first sub-daily tmax/tmin will be the average of all  
first sub-daily time-steps, second sub-daily tmax/tmin will be the  
average of all second sub-daily time-steps and so on.

Now, averaging final 8 diurnal time steps will not give you correct  
daily average, therefore, that output should ONLY be used for diurnal  
analysis.

Moet



On Dec 11, 2009, at 2:41 AM, Smz Rcm wrote:

> I used postproc.x
> but in postproc.in there are: DIURNALI AVG and CONTINUOUS AVG!
> these two options don't give the same result for Tmin and Tmax
> so wich I have to use?
> regards
>
> --- En date de : Ven 11.12.09, bixq <bixq at ictp.it> a écrit :
>
> De: bixq <bixq at ictp.it>
> Objet: Re: [RegCNET] mismatch in averaging!
> À: "Smz Rcm" <smzrcm at yahoo.fr>
> Cc: regcnet at lists.ictp.it
> Date: Vendredi 11 Décembre 2009, 10h34
>
>
> Hi, Sassi:
>
> Correct ! for the following 5 fields in SRF file:
> tgmax, tgmin, t2max, t2min, w10max and ps_min
>
> You have to run postproc.f (or day_SRF.f) firstly.
>
> (https://lists.ictp.it/pipermail/regcnet/2009/001900.html)
>
> On Fri, 11 Dec 2009, Smz Rcm wrote:
>
> > Dear RegCMers,
> > I tried some simulations using ReGCM3 with ERA40 and with EH50M  
> data, but after the postprocessing step, I had some doubt about Tmin  
> and Tmax values, because when I make a diurnal averaging I get more  
> realistic values than when making daily continuous averaging. and  
> the difference is really important!
> > so what should I do please? I get Tmin and Tmax from the 8  
> averaged values of diurnal file?
> > Thanks for help
> > Sassi
> >
> >
> >
> >
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   Dr. Xunqiang Bi         email:bixq at ictp.it
>   Earth System Physics Group
>   The Abdus Salam ICTP
>   Strada Costiera, 11
>   P.O. BOX 586, 34100 Trieste, ITALY
>   Tel: +39-040-2240302  Fax: +39-040-2240449
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> _______________________________________________
> RegCNET mailing list
> RegCNET at lists.ictp.it
> https://lists.ictp.it/mailman/listinfo/regcnet


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ictp.it/pipermail/regcnet/attachments/20091211/b9cfb83f/attachment.htm>