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<div class="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>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><br>
</span></div>
<div class="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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<br>
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Sincerely,
<div>Wenrui</div>
<br>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<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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<br>
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