<html aria-label="message body"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Killampalli,<div><br></div><div>you can use pkg/rbcs for that, there’s even some documentation: <a href="https://mitgcm.readthedocs.io/en/latest/phys_pkgs/rbcs.html">https://mitgcm.readthedocs.io/en/latest/phys_pkgs/rbcs.html</a></div><div><br></div><div>pkg/ctrl cannot be used for restoring.</div><div><br></div><div>Martin<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On 7. Apr 2026, at 07:43, Killampalli Rajesh <rajesh70530@gmail.com> wrote:</div><br class="Apple-interchange-newline"><div><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><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>
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