<div dir="ltr">Hi Spencer,<div>Thanks for the reply. I tested out two of your ideas. After hosing for one year, I first let the AMOC recover for 100 years. Oxygen basically remained the same. Then I hosed with 5Sv of freshwater for ten years. AMOC is basically gone at this point:</div><div><img src="cid:ii_kt3mucg74" alt="image.png" width="461" height="250"><br></div><div><br></div><div>However, oxygen still didn't change much:</div><div><img src="cid:ii_kt3muvni5" alt="image.png" width="450" height="239"><br></div><div><br></div><div>Going forward, I might test out the different advection schemes and other ptracer parameters to see if that helps. Again, I appreciate your help.</div><div><br></div><div>Best,</div><div>Yuxin</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 1, 2021 at 10:29 PM Spencer Jones <<a href="mailto:spencerjones@tamu.edu">spencerjones@tamu.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Dear Yuxin, <div>It seems to me that maybe you just didn't run for long enough to see any change in the oxygen concentration. >From your email it seems like you only ran for 1 year. Is that right? I wouldn't expect the oxygen concentration to change until several years (maybe even decades) after hosing has taken place, and only to change if the reduction in the AMOC continues (i.e. you might want to continue hosing, rather than switching it off). </div><div><br></div><div>I'm not sure why tutorial_global_oce_biogeo doesn't match with observations, but usually the tutorial experiments are set up to demonstrate the model functionality, not to provide a very realistic simulation. You might need to put more work into improving the forcing fields and/or resolution in order to get realistic output. </div><div>Good luck , </div><div>Spencer</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Aug 31, 2021 at 9:28 PM Yuxin Zhou <<a href="mailto:yzhou@ldeo.columbia.edu" target="_blank">yzhou@ldeo.columbia.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi all,<div>I'm running the tutorial_global_oce_biogeo experiment and analyzing the oxygen results and I found some weird behaviors. Any help would be appreciated.</div><div><br></div><div>Here is the AMOC stream function in equilibrium, which looks normal:</div><div><img src="cid:ii_kt0vb6g20" alt="image.png" width="461" height="250"><br><div><br></div><div>Here is the AMOC stream function after a hosing of 5 Sv for one year (by increasing precipitation in the 50-70N North Atlantic region), which looks normal too. It shows a weakened NADW:</div><div><img src="cid:ii_kt0vbx7k1" alt="image.png" width="461" height="250"><br></div><div><br></div><div>Here is the oxygen concentration of the AMOC cross-section in equilibrium:</div><div><img src="cid:ii_kt0vcr252" alt="image.png" width="450" height="239"><br></div><div><br></div><div>Here is the oxygen concentration after the hosing:</div><div><img src="cid:ii_kt0vd7hz3" alt="image.png" width="450" height="239"><br></div><div><br></div><div>Firstly, the oxygen concentration of the AMOC in equilibrium does not reflect modern observations such as the World Ocean Atlas, which shows oxygenated water closely following the presence of the NADW. Secondly, oxygen basically doesn't change even though circulation changed dramatically. It seems convection processes barely impact oxygen at all.</div><div><br></div><div>Has anyone else seen this behavior? Any suggestions for tests I can run to figure out what's wrong?</div><div><br></div><div>Thanks,</div><div>Yuxin</div>-- <br><div dir="ltr"><div dir="ltr">Yuxin Zhou<div><a href="https://urldefense.com/v3/__https://www.ldeo.columbia.edu/*yzhou/__;fg!!KwNVnqRv!XGV-_ZoSHtQ8Iafno1yNILLkNCN6MaDMwIwpWla_Ftn5cl116QSs05k-WzMaoC6wDGs$" target="_blank">https://www.ldeo.columbia.edu/~yzhou/</a><br></div></div></div></div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Yuxin Zhou<div><a href="https://www.ldeo.columbia.edu/~yzhou/" target="_blank">https://www.ldeo.columbia.edu/~yzhou/</a><br></div></div></div>