[MITgcm-support] ECCOv4 Configurations: R-Star Coordinate Error with Modified Wind Forcing

[Yohei Takano - BAS]

Dear all,

   I am working on setting up a simulation with the ECCOv4-r2 configuration. The first step is to
run (spin-up) the model with this configuration, except I detrended the atmospheric wind forcing
(including zonal, meridional wind stress and surface wind speed). The model ran for a while (~ 10 years)
but stops after that with "STOP ABNORMAL END: S/R CALC_R_STAR", which is related to the r* coordinate
from my understanding. More specifically it is "too SMALL rStarFac[C,W,S]" and I see very small
hFactorC (from diagnostics) at a grid point near the continent (or perhaps sea ice related since it is in the Southern Ocean).

   The reason behind the error is this modified atmospheric wind forcing but I am a bit stuck on how I can
fix this issue (i.e. how can I further modify the forcing to prevent this error) and would like to ask for advice on dealing with
this issue. I saw comments in the previous question (in this list) lowering deltaT but I don't think that will solve the issue in this case.

    rStarFac error actually happens quite often in my case modifying the atmospheric forcing and for those
who have experienced similar challenge, I would like to ask for some advice how to deal with this.
Thank you in advance.

Regards,

Yohei


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