[MITgcm-support] too SMALL rStarFac[C,W,S]

[Martin Losch]

This usually means that either the model blows up due to numerical instabilities (and this is then reflected in strangely low values of Eta), or more likely that you are continuously loosing “mass”/volume and your sea surface height is dropping, or if you are using sea ice, then the ice thickness may be too high and depresses your surface too much. Check your mean and minimum Eta (e.g. from the monitor output dynstat_eta_mean/min) over time to find out. How to fix this depends on your general configuration, which I know nothing about.

Martin

> On 18. Jul 2022, at 13:42, Haoran Xu <xu1jian2wei3 at 163.com> wrote:
> 
> Dear all，
>         Hope everything's fine, I recently encountered a error when the model running for 4 years, the rStarFac[C,W,S]  are too small.
> 
>  fail at i,j=  21   3 ; rStarFacC,H,eta =  0.008609  2.000000E+01 -1.982781E+01
>  fail at i,j=  21   4 ; rStarFacS,H,eta = -0.051725  2.000000E+01 -1.982781E+01 -2.225077E+01
>  fail at i,j=  22   4 ; rStarFacC,H,eta = -0.215612  2.000000E+01 -2.431223E+01
>  fail at i,j=  22   4 ; rStarFacW,H,eta = -0.164265  2.000000E+01 -2.225077E+01 -2.431223E+01
>  fail at i,j=  22   5 ; rStarFacS,H,eta = -0.177673  2.000000E+01 -2.431223E+01 -2.279858E+01
> WARNING: r*FacC < hFacInf at       2 pts : bi,bj,Thid,Iter=   1   1   1     35071
> WARNING: r*FacW < hFacInf at       1 pts : bi,bj,Thid,Iter=   1   1   1     35071
> WARNING: r*FacS < hFacInf at       2 pts : bi,bj,Thid,Iter=   1   1   1     35071
> STOP in CALC_R_STAR : too SMALL rStarFac[C,W,S] !
> 
>       I've tried to change the value of depth or eta but not work. Thanks for any advices.
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