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<span style="font-family: Arial, Helvetica, sans-serif;">Hi Wenrui,</span></div>
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<span style="font-family: Arial, Helvetica, sans-serif;"><br>
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<div class="elementToProof"><span style="font-family: Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">I had a problem as well in closing my tracers budget (by just looking at timeseries of my tracers integrated over my domain, I could see
a drift). I don't know if it can help you but I added the following line in data.ptracers for all my tracers (1 to 5):</span></div>
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<div class="elementToProof"><span style="font-family: Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><b>PTRACERS_linFSConserve(1)=.TRUE.,</b></span></div>
<pre><div class="elementToProof"><span style="font-family: Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">PTRACERS_linFSConserve applies mean Free-Surf source/sink at surface.</span></div></pre>
<div class="elementToProof"><span style="font-family: Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Good luck,</span></div>
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<div class="elementToProof"><span style="font-family: Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Sandy</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>De :</b> MITgcm-support <mitgcm-support-bounces@mitgcm.org> de la part de Wenrui Jiang <wjiang33@jhu.edu><br>
<b>Envoyé :</b> lundi 4 mars 2024 13:18<br>
<b>À :</b> mitgcm-support@mitgcm.org <mitgcm-support@mitgcm.org><br>
<b>Objet :</b> [MITgcm-support] Closing DIC budget</font>
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<div style="color:#000000"><span style="color:#000000; font-weight:bold">ATTENTION :</span>
<span style="color:#000000; font-size:10.0pt">Ce courriel provient d'une source externe. Assurez-vous que cette dernière est sûre avant d'ouvrir une pièce jointe ou de cliquer sur un lien. Dans le doute, signalez le message.
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<div class="x_elementToProof"><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:11pt; color:rgb(0,0,0)">Dear MITgcm support group,<br>
<br>
Thanks for reading this. My name is Wenrui Jiang, and I am a PhD student from Johns Hopkins. I want to apologize in advance for my inexperience.<br>
<br>
I am trying to close the DIC budget on the biogeochemical tutorial example (<a href="https://mitgcm.readthedocs.io/en/latest/examples/global_oce_biogeo/global_oce_biogeo.html" id="LPlnk840669">https://mitgcm.readthedocs.io/en/latest/examples/global_oce_biogeo/global_oce_biogeo.html</a>).
The diagnostics that I include are:<br>
<br>
TRAC01 |SMR MR|mol/m^3 |Dissolved Inorganic Carbon (DIC) [mol C/m^3] concentration<br>
ForcTr01|SMR MR|mol/m^3/s |DIC forcing tendency<br>
AB_gTr01|SMR MR|mol/m^3/s |DIC tendency from Adams-Bashforth<br>
Tp_gTr01|SMR MR|mol/m^3/s |DIC total transport tendency (before gchem_forcing_sep)<br>
ADVrTr01|WM LR|mol/m^3.m^3/s |Vertical Advective Flux of DIC<br>
ADVxTr01|UU MR|mol/m^3.m^3/s |Zonal Advective Flux of DIC<br>
ADVyTr01|VV MR|mol/m^3.m^3/s |Meridional Advective Flux of DIC<br>
DFrETr01|WM LR|mol/m^3.m^3/s |Vertical Diffusive Flux of DIC (Explicit part)<br>
DFxETr01|UU MR|mol/m^3.m^3/s |Zonal Diffusive Flux of DIC<br>
DFyETr01|VV MR|mol/m^3.m^3/s |Meridional Diffusive Flux of DIC<br>
DFrITr01|WM LR|mol/m^3.m^3/s |Vertical Diffusive Flux of DIC (Implicit part)<br>
<br>
DICBIOA | 15 |SM P MR |mol/m3/sec |Biological Productivity (mol/m3/s)<br>
DICCARB | 15 |SM P MR |mol eq/m3/sec |Carbonate chg-biol prod and remin (mol eq/m3/s)<br>
DICTFLX | 1 |SM P L1 |mol/m3/sec |Tendency of DIC due to air-sea exch (mol/m3/s<br>
<br>
So far, I managed to close the Tp_gTr01 term with the advective and diffusive flux in the interior to machine precision. However, at the surface there is a large residual, which I am not able to close with ForcTR01. I am wondering if this is a dilution effect
from PTRACER_ref.<br>
<br>
I am also having a hard time matching Tp_gTr01 and the tendency diagnosed from DIC and Eta snapshots using the GCHEM diagnostics. The GCHEM diagnostics seems to have very small value (10^-10 mol/m^3/s) which is much smalller than the difference.<br>
<br>
I would really appreciate it if you could tell me whether:<br>
<br>
1. I am using the correct diagnostics in the correct way;<br>
2.there are any model setups that prevent a tracer closure.<br>
</span></div>
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</span></div>
<div class="x_elementToProof"><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:11pt; color:rgb(0,0,0)">Thank you very much!<br>
</span></div>
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Sincerely,
<div>Wenrui</div>
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<span style="font-size:16pt; color:rgb(12,136,42)">Wenrui Jiang</span></div>
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<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Ph.D. Student,</div>
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Department of Earth & Planetary Sciences,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Johns Hopkins University.</div>
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<br>
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Email: wjiang33@jh.edu</div>
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