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<p>I think it's "GM_isopycK" which is the Redi part? By default if that is not specified I think it takes on the value of GM (although I don't know if this would be "GM_background_K" or whatever the kGM value that the Visbeck scheme spits out in this case).</p>
<p><br>
</p>
<p>A data.gmredi I used is given below; ignore the MMB stuff which is our GEOMETRIC implementation where we hijacked the existing Visbeck scheme in a rather disgusting fashion (I haven't tried very hard tidying it up...)<br>
</p>
<p><br>
</p>
<p>Best wishes,<br>
Julian<br>
</p>
<p><br>
</p>
<p>%%%%%%%%%%%%%%%%%%%%<br>
</p>
<p><br>
</p>
<p>&GM_PARM01 <br>
GM_AdvForm = .FALSE.<br>
GM_background_K = 0.,<br>
GM_isopycK = 200.,<br>
GM_taper_scheme = 'gkw91',<br>
GM_maxSlope = 5.e-3,<br>
GM_Kmin_horiz = 0.,<br>
GM_Scrit = 4.e-3,<br>
GM_Sd = 1.e-3,<br>
GM_Visbeck_alpha = 0.016,<br>
GM_Visbeck_minval_K= 50.,<br>
GM_Visbeck_maxval_K= 1.e+4,<br>
# MMB params<br>
MMB_lambda = 1.e-7,<br>
MMB_alpha = 0.04,<br>
MMB_minval_K = 50.,<br>
MMB_maxval_K = 1.e+4,<br>
# MMB_minval_K = 1155,<br>
# MMB_maxval_K = 1155,<br>
energy_init = 1.e-2,<br>
energy_kappa = 0,<br>
energy_local = .false.,</p>
<p><br>
</p>
<p>%%%%%%%%%%%%%%%%%%%%</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 20/02/2019 10:34, Naughten, Kaitlin A. wrote:<br>
</div>
<blockquote type="cite" cite="mid:CWLP123MB1970044297241A6162B259138E7D0@CWLP123MB1970.GBRP123.PROD.OUTLOOK.COM">
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<p style="margin-top:0;margin-bottom:0">Hello everyone,</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">I am a bit confused about the GM-Redi scheme, and how to turn on the "GM" part (bolus or skew fluxes) versus just the "Redi" part (tracer diffusion along isentropes). An old message from Martin (<a href="http://mailman.mitgcm.org/pipermail/mitgcm-support/2016-March/010355.html" class="OWAAutoLink" moz-do-not-send="true">http://mailman.mitgcm.org/pipermail/mitgcm-support/2016-March/010355.html</a>)
said that he only used the Redi part, but I'm not sure what options control this.</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">I switched on all the GM-Redi diagnostics in my configuration and discovered that many variables are zero everywhere (GM_PsiX, GM_PsiY, GM_ubT, GM_vbT, GM_hTrsl, GM_baseS, GM_rLamb, plus two components of the Redi tensor
which I think are supposed to be zero: GM_Kuz and GM_Kvz). Does this mean that I only have the Redi part switched on? And if so, why is the GM part not on?</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">Here are the active lines of <span style="font-size: 12pt;">my data.gmredi:</span></p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<div> &GM_PARM01</div>
<div> GM_background_K=10.,</div>
<div> GM_taper_scheme='ldd97',</div>
<div> GM_Kmin_horiz=50.,</div>
<div> GM_Visbeck_alpha=0.07, </div>
<div> GM_Visbeck_length=50.E3,</div>
<div> GM_Visbeck_depth=2000.,</div>
<div> GM_Visbeck_maxVal_K=300.,</div>
<br>
<p style="margin-top:0;margin-bottom:0">And here are the active lines of my GM_REDI_OPTIONS.h:</p>
<p style="margin-top:0;margin-bottom:0"><span style="font-size:
12pt;"><br>
</span></p>
<p style="margin-top:0;margin-bottom:0"><span style="font-size:
12pt;">#ifndef GMREDI_OPTIONS_H</span><br>
</p>
<div>#define GMREDI_OPTIONS_H</div>
<div>#include "PACKAGES_CONFIG.h"</div>
<div>#include "CPP_OPTIONS.h"</div>
<div>#ifdef ALLOW_GMREDI</div>
<div>#define GM_VISBECK_VARIABLE_K</div>
<div>#undef OLD_VISBECK_CALC</div>
<div>#undef GM_K3D</div>
<div>#undef GM_K3D_PASSIVE</div>
<div>#define GM_NON_UNITY_DIAGONAL</div>
<div>#define GM_EXTRA_DIAGONAL</div>
<div>#define GM_BOLUS_ADVEC</div>
<div>#undef GM_BOLUS_BVP</div>
<div>#endif /* ALLOW_GMREDI */</div>
<div>#endif /* GMREDI_OPTIONS_H */</div>
<div><br>
</div>
<div>This is probably a stupid question but hopefully that means it has a quick and easy answer!</div>
<div><br>
</div>
<div>Many thanks,</div>
<div>Kaitlin</div>
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</p>
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<div><span style="font-size:11pt; color:rgb(117,123,128)">Dr Kaitlin Naughten</span></div>
<span style="font-size:11pt; color:rgb(117,123,128)"></span>
<div><span style="font-size:11pt; color:rgb(117,123,128)">British Antarctic Survey</span></div>
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<pre class="moz-signature" cols="72">--
Julian Mak,
Department of Physics,
University of Oxford,
Clarendon Laboratory, Parks Road
Oxford, OX1 3PU
e-mail: <a class="moz-txt-link-abbreviated" href="mailto:julian.mak@physics.ox.ac.uk">julian.mak@physics.ox.ac.uk</a>
www: <a class="moz-txt-link-freetext" href="https://sites.google.com/site/julianclmak/home">https://sites.google.com/site/julianclmak/home</a></pre>
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