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Hi</div>
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Apologies - this ended up in my spam folder</div>
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<div dir="ltr"><span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><a href="https://github.com/jklymak/MITgcmcode/blob/master/code/energy_diagnostics_fill.F" data-outlook-id="92282ceb-50c9-4202-99ac-2279fc19d563" style="color: rgb(0, 0, 0);">https://github.com/jklymak/MITgcmcode/blob/master/code/energy_diagnostics_fill.F</a></span><span style="font-size: 16px;"> is
probably the better code. I </span>should<span style="font-size: 16px;"> remove the other code, as it is wrong.</span></div>
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<div dir="ltr" style="font-size: 16px;">Sorry for the confusion - please let me know if this works for you</div>
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<div dir="ltr" style="font-size: 16px;">Thanks, Jody</div>
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<b>From: </b>MITgcm-support <mitgcm-support-bounces@mitgcm.org> on behalf of Hughes, Kenneth <kenneth.hughes@oregonstate.edu><br>
<b>Date: </b>Sunday, August 10, 2025 at 3:08 PM<br>
<b>To: </b>mitgcm-support@mitgcm.org <mitgcm-support@mitgcm.org><br>
<b>Subject: </b>Re: [MITgcm-support] 回复: Question about internal tide energy flux balance<br>
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Hi Sean,</div>
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Below are two links to old notes of mine about Jody's energy diagnostics code. They were only intended to be notes to myself (and they're 8 years old), so they might be a bit terse, but I think they could help answer some of your questions.</div>
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The first link is about intermediate calculations within the fortran code. The second link is about an idealized setup that looks at the magnitudes and behaviors of the various terms.</div>
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https://drive.google.com/file/d/1ixlnFmhKCy0EGrHQ7vKlldwOm_mOGVIa/view?usp=sharing</div>
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https://drive.google.com/file/d/1lT56CS_Fgw_g9ecvrxtv_Tt9LNeb3QlS/view?usp=sharing</div>
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Ken Hughes</div>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> MITgcm-support <mitgcm-support-bounces@mitgcm.org> on behalf of Shiqiang Hu (ENV - Postgraduate Researcher) <Shiqiang.Hu@uea.ac.uk><br>
<b>Sent:</b> Sunday, August 10, 2025 1:49 PM<br>
<b>To:</b> mitgcm-support@mitgcm.org <mitgcm-support@mitgcm.org><br>
<b>Subject:</b> [MITgcm-support] 回复: Question about internal tide energy flux balance</span>
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<span style="color: rgb(215, 63, 9);">[This email originated from outside of OSU. Use caution with links and attachments.]</span></p>
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Hi Jody,</div>
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I have been reading your reference materials which is useful. Finally I was able to output the energy dignostics in latest version based on your code, but several questions have arisen:</div>
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1, For <b>baroclinic</b> <b>energy</b> equation <img src="cid:592a7939-f6bc-48b9-b311-cb17b6089067" id="x_x_image_0" data-outlook-trace="F:3|T:3" width="274" height="32" style="width: 274px; height: 32px; max-width: 753px; min-width: auto; min-height: auto; margin: 0px;"> how
did you calculate the first three terms from dignostics outputs, while it seems the equation used in dignostics code is the
<b>total energy</b> equation? I can only find your github pages cause the link in your paper seems no longer valid. I'm confused that Fbc should be <u'p'>, but the dignostics code use the original velosity
<b>uVel</b> and <b>vVel</b> directly to get uPbc and so on.</div>
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2, For Conversion term, the W is derived from <img src="cid:791c1654-63b9-4bb1-9f91-ec3c854ef76b" id="x_x_image_2" data-outlook-trace="F:3|T:3" width="218" height="35" style="width: 218px; height: 35px; max-width: 753px; min-width: auto; min-height: auto; margin: 0px;">in
Kang's 2011 paper. So we don't need the W velosity from the model output? I'm not sure if they are different or my code was wrong.</div>
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Sorry if it’s a lot to explain, but I could really use your help with this. </div>
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Thanks and cheers!</div>
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Sean</div>
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University of East Anglia</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>发件人:</b> MITgcm-support <mitgcm-support-bounces@mitgcm.org> 代表 Jody Klymak <jklymak@uvic.ca><br>
<b>发送时间:</b> 2025年7月19日 1:18<br>
<b>收件人:</b> mitgcm-support@mitgcm.org <mitgcm-support@mitgcm.org><br>
<b>主题:</b> Re: [MITgcm-support] Question about internal tide energy flux balance</span>
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<b>Warning:</b> This email is from outside the UEA system. Do not click on links or attachments unless you expect them from the sender and know the content is safe.</p>
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<span style="font-size: 11pt;">Hi Sean</span></p>
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<span style="font-size: 11pt;"> </span></p>
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<span style="font-size: 11pt;">This is probably outdated, but the writeup and the diagnostic may help you with your problem:</span></p>
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<span style="font-size: 11pt;"> </span></p>
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<span style="font-size: 11pt; color: blue;"><u><a href="https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/" originalsrc="https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/" data-outlook-id="b5cc8f49-d6d2-4924-8bf2-773299637c16" style="color: blue; margin-top: 0px; margin-bottom: 0px;">https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/</a></u></span></p>
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<span style="font-size: 11pt;"> </span></p>
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<span style="font-size: 11pt;">in particular </span><span style="font-size: 11pt; color: blue;"><u><a href="https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/energy_diagnostics_fill.F" originalsrc="https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/energy_diagnostics_fill.F" data-outlook-id="f9e89e5d-cffe-4c23-837d-bf59f91ac36a" style="color: blue; margin-top: 0px; margin-bottom: 0px;">https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/energy_diagnostics_fill.F</a></u></span></p>
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<span style="font-size: 11pt;">and</span></p>
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<span style="font-size: 11pt; color: blue;"><u><a href="https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/EnergyDiagnostic.pdf" originalsrc="https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/EnergyDiagnostic.pdf" data-outlook-id="8b5482ff-c369-4c4e-9ee1-05b522093a34" style="color: blue; margin-top: 0px; margin-bottom: 0px;">https://ocean-physics.seos.uvic.ca/~jklymak/MITgcm/EnergyDiagnostic.pdf</a></u></span></p>
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<span style="font-size: 11pt;"> </span></p>
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<span style="font-size: 11pt;">This was used extensively in</span> <span style="font-size: 11pt; color: blue;">
<u><a href="https://doi.org/10.1175/2010JPO4396.1" target="_blank" originalsrc="https://doi.org/10.1175/2010JPO4396.1" data-outlook-id="47c19913-c0fc-474f-9253-d1cd600f66bc" style="color: blue; margin-top: 0px; margin-bottom: 0px;">10.1175/2010JPO4396.1</a></u></span><span style="font-size: 11pt;"> and
10.1175/JPO-D-16-0061.1</span></p>
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<span style="font-size: 11pt;"> </span></p>
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<span style="font-size: 11pt;">Hopefully that helps, if not, I can probably provide more guidance.</span></p>
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<span style="font-size: 11pt;">Cheers Jody</span></p>
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<span style="font-size: 11pt;"> </span></p>
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<span style="font-family: Calibri, sans-serif; color: black;"><b>From: </b>MITgcm-support <mitgcm-support-bounces@mitgcm.org> on behalf of "Shiqiang Hu (ENV - Postgraduate Researcher)" <Shiqiang.Hu@uea.ac.uk><br>
<b>Reply-To: </b>"mitgcm-support@mitgcm.org" <mitgcm-support@mitgcm.org><br>
<b>Date: </b>Friday, July 18, 2025 at 9:58 AM<br>
<b>To: </b>"mitgcm-support@mitgcm.org" <mitgcm-support@mitgcm.org><br>
<b>Subject: </b>[MITgcm-support] Question about internal tide energy flux balance</span></p>
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<span style="letter-spacing: revert; font-family: wf_segoe-ui_normal, serif; font-size: 9pt; color: rgb(33, 33, 33);">You don't often get email from shiqiang.hu@uea.ac.uk.
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why this is important</a></u></span></p>
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<span style="color: black;">Hi MITgcm commuity,</span></p>
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<span style="color: black;"> </span></p>
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<span style="color: black;">Hope you all well.</span></p>
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<span style="color: black;"> </span></p>
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<span style="color: black;">I built an idealized 3D internal tide model based on </span>
<span style="color: blue;"><u><a href="https://github.com/MITgcm/MITgcm/blob/master/verification/internal_wave" title="https://github.com/MITgcm/MITgcm/blob/master/verification/internal_wave" originalsrc="https://github.com/MITgcm/MITgcm/blob/master/verification/internal_wave" data-outlook-id="712a3338-e696-443e-9644-8c1fa8b68018" style="color: blue; margin-top: 0px; margin-bottom: 0px;">internal_wave
experiment</a></u></span><span style="color: black;"> to calculate the energy flux F=<u'p'>(</span><span style="color: blue;"><u><a href="https://doi.org/10.1175/JTECH1784.1" title="https://doi.org/10.1175/JTECH1784.1" originalsrc="https://doi.org/10.1175/JTECH1784.1" data-outlook-id="c9da49ff-d73b-4799-99f1-3b8359193fb2" style="color: blue; margin-top: 0px; margin-bottom: 0px;">Nash et
al., 2005</a></u></span><span style="color: black;">). Periodic 1-mode internal tides propagate to the right and interact with a simple topography. The model works but I got stuck at the energy flux balance part. Sometimes when I chose a small area within
the topography to calculate the net energy flux across its boundary, the result is positive, which means there are rather dissipation but genaration of enerny. So I wanna ask if someone has experience with this. </span></p>
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<span style="color: black;">Basically, I use <i>RHOAnoma</i>+<i>rhoConst</i> to get original density
<i>rho</i>, cause the paper gets density anomaly from </span><span style="color: black; background-color: white;"><i>rho(z,t)-rho_mean(z),
</i>where<i> rho_mean(z) </i>is the time mean vertical density profile (I guess I could also just use the
<i>Rhoref(z) </i>as the reference profile?). The question is the C-grids, should I calculate these values on T-points or U-V points so the energy could be more balenced? Or maybe some other factors I didn't realize? </span></p>
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<span style="color: black; background-color: white;">By the way, the non-hydrostatic pressure is quite small, so I ignored it.</span></p>
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<span style="color: black;"> </span></p>
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<span style="color: black; background-color: white;">Thanks for any suggestions.</span></p>
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<span style="color: black; background-color: white;">Kind regards,</span></p>
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<span style="color: black;"> </span></p>
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<span style="color: black; background-color: white;">Sean</span></p>
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<span style="color: black;">University of East Anglia</span></p>
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