[MITgcm-support] Stevens BC

[Martin Losch]

Hi Lambert,

this is way to unspecific to help. You need to find out where the model crashes (near the boundaries?) and then possibly understand if your prescribed files are not correct.

Martin

> On 13. May 2021, at 14:37, 赤羽蓝 <lanchiyu12 at gmail.com> wrote:
> 
> Hi all,
> 
> I am running a regional ocean model with the OBCS package. When I use the Stevens boundary conditions, the model always crashes with "stops due to EXTREME Pot.Temp". The model is OK if I turn off the Stevens BC. I have tried different inflows(outflow) at the Stevens boundary, which encounter the same crashing. The sponge boundary layer didn't help either. I also tried different relaxation time, no help.
> 
> Attaching my data.obcs file.
>   
> Any ideas will be grateful.
> 
> Lambert
> 
> # ***************
> # Open boundaries
> # ***************
>  &OBCS_PARM01
> # This flag turns off checking and fixing problematic topography across
> # open boundaries.
>  OB_Jnorth = 360*-1,
>  OB_Jsouth = 360*1,
>  OB_Iwest = 528*1,
>  OB_Ieast = 528*-1,
>  useOBCSprescribe=.TRUE.,
>  useStevensWest = .TRUE.,
>  useStevensNorth = .TRUE.,
> # useOBCSsponge=.TRUE.,
>  useOBCSbalance=.FALSE.,
> # OBCS_balanceFacE = 1.,
> # OBCS_balanceFacW = 1.,
> # OBCS_balanceFacN = 1.,
> # OBCS_balanceFacS = 1.,
> 
>  OBNsFile='sn.scs',
>  OBNtFile='tn.scs',
>  OBNvFile='vn.scs',
>  OBNuFile='un.scs',
> 
>  OBSsFile='ss.scs',
>  OBStFile='ts.scs',
>  OBSvFile='vs.scs',
>  OBSuFile='us.scs',
> 
>  OBEsFile='se.scs',
>  OBEtFile='te.scs',
>  OBEvFile='ve.scs',
>  OBEuFile='ue.scs',
> 
>  OBWsFile='sw.scs',
>  OBWtFile='tw.scs',
>  OBWvFile='vw.scs',
>  OBWuFile='uw.scs',
>  &
> 
> # &OBCS_PARM03
> # Urelaxobcsinner=864000,
> # Urelaxobcsbound=864000,
> # Vrelaxobcsinner=864000,
> # Vrelaxobcsbound=864000,
> # spongeThickness=5,
> # &
> 
>  &OBCS_PARM04
>  TrelaxStevens = 86400.,
>  SrelaxStevens = 86400.,
>  &
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