<div dir="ltr">Hello!<div><br></div><div>Recently I've found a conversation at github about possible problems with the seaice package related to too large LSR_ERROR value set by default to 1.0e-4.</div><div><a href="https://github.com/MITgcm/MITgcm/issues/171">https://github.com/MITgcm/MITgcm/issues/171</a><br></div><div><br></div><div>In that topic it was suggested to use a smaller value of
LSR_ERROR: 1.0e-5 or 1.0e-6, for convergence reasons. It was in 2019.</div><div><font face="arial, sans-serif"><br></font></div><div><font face="arial, sans-serif">I wonder if a consensus has been achieved in the MITgcm community for now about this tuning?</font></div><div><font face="arial, sans-serif"><br></font></div><div><font face="arial, sans-serif">This question has arisen because I periodically get NaNs (I suspect it is because of sea ice) in a high-res model with resolution O(1 km). It occurs during the melting period in summer. Reducing the deltaT from 120 sec to 90 solved the problem, but it occurred again already with 90 sec in the next month . Surprisingly, returning back to 120 sec allowed me to get through it. I use the default LSR solver and suspect that the problem may be a bed convergence of the sea ice model.</font></div><div><font color="#000000" face="arial, sans-serif"><br></font></div><div><font color="#000000" face="arial, sans-serif">What can be a better remedy in this case:</font></div><div><font color="#000000" face="arial, sans-serif">1) continue to use LST solver but set LSR_ERROR =
1.0e-5, everything else is default. Should I also change SEAICEnonLinIterMax in this case from default 2 to 10?<br></font></div><div><font color="#000000" face="arial, sans-serif">2) LSR is not good for high-res. Entirely switch to EVP solver (SEAICEuseEVPrev or
SEAICEuseEVPstar?)<span style="font-size:14px">, everything is default.</span></font></div><div><span style="font-size:14px"><font color="#000000" face="arial, sans-serif"><br></font></span></div><div><span style="font-size:14px"><font color="#000000" face="arial, sans-serif">Thanks,</font></span></div><div><span style="font-size:14px"><font color="#000000" style="" face="arial, sans-serif">Stanislav Martyanov</font></span></div></div>