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<span style="margin:0px;font-size:12pt;font-family:Calibri, Arial, Helvetica, sans-serif, serif, EmojiFont;background-color:rgb(255, 255, 255)">Hullo,</span>

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I'm trying to figure out what versions of the Boussinesq equations the ISOMIP tutorial example is solving </div>

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<a href="https://github.com/MITgcm/MITgcm/tree/master/verification/isomip" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0" style="margin:0px">https://github.com/MITgcm/MITgcm/tree/master/verification/isomip</a></div>

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It includes non hydrostatic code.</div>

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#define ALLOW_NONHYDROSTATIC <a href="https://github.com/MITgcm/MITgcm/blob/master/verification/isomip/code/CPP_OPTIONS.h" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="1" style="margin:0px">https://github.com/MITgcm/MITgcm/blob/master/verification/isomip/code/CPP_OPTIONS.h</a><br>

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<span style="margin:0px">In the MITgcm documents it explains:</span><br>

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1.3.4.4.2. Ocean<br>

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Non-hydrostatic forms of the<span> </span><b>incompressible</b><span> </span>Boussinesq equations in z- coordinates are supported - see eqs. (1.98) to (1.103).<br>

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BUT eqns<span> </span><span style="margin:0px;background-color:rgb(255, 255, 255);display:inline !important">(1.98) to (1.103) are not the incompressible eqns, they are the semi-compressible.</span></div>

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<span style="margin:0px;background-color:rgb(255, 255, 255);display:inline !important"><a href="https://mitgcm.readthedocs.io/en/latest/overview/hydrostatic.html" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="2" style="margin:0px">https://mitgcm.readthedocs.io/en/latest/overview/hydrostatic.html</a><br>

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In the non-hydrostatic ocean model all terms in equations Eqs.(1.29 $B"*(B<br>

1.31) are retained.<br>

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Which is true? Is the nonhydrostatic code running incompressible or semi-compressible <span style="margin:0px;background-color:rgb(255, 255, 255);display:inline !important">Boussinesq equations?</span></div>

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<span style="margin:0px;background-color:rgb(255, 255, 255);display:inline !important">Thanks,<br>

Arran</span></div>

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