<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif"><p class="gmail-isSelectedEnd">Dear MITgcm Support Team,</p><p class="gmail-isSelectedEnd">I am running a regional MITgcm simulation (~3 km resolution) with time-varying GLORYS boundary conditions (U, V, T, S, SSH). I observe bias in surface currents (magnitude and direction), and mesoscale/submesoscale eddies are not well captured in the interannual simulations.</p><p class="gmail-isSelectedEnd">I initially considered applying relaxation (nudging) the SST and SSS (e.g., via climatological relaxation or using boundary-driven constraints in <code dir="ltr">data.obcs</code>). However, I understand that this not improving in the surface currents.<br></p><p class="gmail-isSelectedEnd">I am considering whether surface current nudging (similar to SST/SSS) is possible or advisable. Specifically:</p><ul><li>Can <code dir="ltr">pkg/ctrl</code> be used to weakly/daily constrain surface currents or SSH?</li><li>Is there any recommended approach to improve surface currents without suppressing eddies?</li></ul><p class="gmail-isSelectedEnd">Any guidance would be appreciated.</p><p><span style="color:rgb(7,55,99);font-family:"times new roman",serif"> </span><span style="color:rgb(7,55,99)">Kind regards</span><br></p><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><p class="MsoNormal">```````````````````````````````````````````````<br></p><div><p class="MsoNormal"><span style="font-family:verdana,sans-serif"><font color="#073763"> Killampalli Rajesh (Research Scholar)</font></span></p><p class="MsoNormal"><span style="font-family:verdana,sans-serif"><font color="#073763"> </font></span><span style="color:rgb(7,55,99);font-family:verdana,sans-serif">Centre For Atmospheric Sciences,</span></p></div><p class="MsoNormal"><span style="font-family:verdana,sans-serif"><font color="#073763"> Indian Institute of Technology, Delhi</font></span></p><p class="MsoNormal"><span style="font-family:verdana,sans-serif"><font color="#073763"> Hauz Khas, New Delhi - 110016</font></span></p><p class="MsoNormal"><span style="font-family:verdana,sans-serif"><font color="#073763"> O-Email: <a href="mailto:rajesh93.cstaff@iitd.ac.in" target="_blank">asz238484@iitd.ac.in<br></a></font></span></p><p class="MsoNormal"><span style="font-family:verdana,sans-serif"><font color="#073763"> P-Email:  <a href="mailto:rajesh93.cstaff@iitd.ac.in" target="_blank">rajesh70530@gmail.com</a></font><span style="color:rgb(44,54,58);font-size:14px;text-align:center"></span></span></p><p class="MsoNormal"><span style="font-family:verdana,sans-serif"><font color="#073763"><span style="font-size:9.5pt"> P</span><span style="font-size:9.5pt">hone: +91 9492068095.</span></font></span></p><span style="font-family:verdana,sans-serif"><font color="#073763">```````````````````````````````````````````````</font></span></div></div></div></div></div>