Dear Prof. Kamga,

Let me know ur resolution, time steps and year of simulation. If it doesn't work with decreased time steps, try to increase the resolution a little.

Shekhar

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From: "moetasim" <moetasim@gcisc.org.pk>
To: "Prof.Mkankam Kamga François" <fmkankam@uycdc.uninet.cm>,"RegCNET" <regcnet@lists.ictp.it>
Subject: [RegCNET]Re: Problem using NNPR2
Date: Tue, 30 Aug 2005 11:43:31 -0500
>If it slows down and gives nan nan then there must be some problem with ICBCs. Can you check
>them before running regcm. And if you find problem in ICBC then check your NNRP window!
>
>BTW, does it give same problem no matter what is the date of your experiment with NNRP window?
>MOet
>
>
>On Tue, 30 Aug 2005 14:54:47 +0100 (WAT), Prof.Mkankam Kamga François wrote
> > Hi all,
> > I have this particular problem using the NNPR2 reanalysis as BC in RegCM3.
> > The program becomes very slow as compared to when using ERA40
> > dataset. The NNPR2 data I have is an African window subset. I
> > notice that the program says that first and second derivatives of ps
> > are NaN. Any idea what the problem may be? I lowered timestep as
> > suggested by Jeremy but no improvement. Best regards Kamga
> >
> > --
> > Prof. MKANKAM KAMGA François
> > Laboratory for Environmental Modelling and Atmospheric Physics
> > Department of Physics, Faculty of Sciences, University of Yaounde I
> > P.O. Box 812 Yaoundé, Cameroon
> > Tel C. (237) 782 3868 H. (237) 231 5665
> >
> > fmkankam@uycdc.uninet.cm , mkankam@cenadi.cm
> >
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