[MITgcm-support] errors when shifting from curvilinear to spherical coordinates

[Yi-Chih Huang]

Hello,

     I work on the rotating tank with cold blobs at the top.  I can run the
model in curvilinear coordinates with time interval 1.2 s.  When shifting
to spherical coordinates, I got numerous NaN in STDOUT files in the
beginning although the time interval is very small.  Below are the
differences between the file data in these two coordinates.  Also, I
attached the file data and STDOUT file.  There is nothing different
in STDERR files.  I wonder what caused the errors in the spherical
coordinates?  Could you give me some hints?

<  nIter0=      0,
<  nTimeSteps= 75000,
<  deltaT=0.00001,
---
>  nIter0= 0,
>  nTimeSteps=7500000,
> #nTimeSteps=36000000,
>  deltaT=1.2,
72c73
<  usingSphericalPolarGrid=.TRUE.,
---
>  usingCurvilinearGrid=.TRUE.,
73a75
>  radius_fromHorizGrid=6370.E3,
76,78c78,79
<  delX=256*0.125,
<  delY=256*0.125,
<  ygOrigin=53.,
---
> # delX=256*0.25,
> # delY=256*0.25,

    Thanks,

                        Yi-Chih
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