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<p style="margin-top:0;margin-bottom:0">Hello everyone,</p>
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<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">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>
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<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>
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<p style="margin-top:0;margin-bottom:0">Here are the active lines of <span style="font-size: 12pt;">my data.gmredi:</span></p>
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<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></p>
<p style="margin-top:0;margin-bottom:0">And here are the active lines of my GM_REDI_OPTIONS.h:</p>
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<p style="margin-top:0;margin-bottom:0"><span style="font-size: 12pt;">#ifndef GMREDI_OPTIONS_H</span><br>
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<div>#define GMREDI_OPTIONS_H</div>
<div>#include "PACKAGES_CONFIG.h"</div>
<div>#include "CPP_OPTIONS.h"</div>
<div>#ifdef ALLOW_GMREDI</div>
<div></div>
<div>#define GM_VISBECK_VARIABLE_K</div>
<div></div>
<div>#undef OLD_VISBECK_CALC</div>
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<div>#undef GM_K3D</div>
<div>#undef GM_K3D_PASSIVE</div>
<div></div>
<div>#define GM_NON_UNITY_DIAGONAL</div>
<div></div>
<div>#define GM_EXTRA_DIAGONAL</div>
<div></div>
<div>#define GM_BOLUS_ADVEC</div>
<div></div>
<div>#undef GM_BOLUS_BVP</div>
<div>#endif /* ALLOW_GMREDI */</div>
<div>#endif /* GMREDI_OPTIONS_H */</div>
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<div>This is probably a stupid question but hopefully that means it has a quick and easy answer!</div>
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<div>Many thanks,</div>
<div>Kaitlin</div>
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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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