[MITgcm-support] Passive tracer decoupling from convection

[Yuxin Zhou]

Hi all,
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.

Here is the AMOC stream function in equilibrium, which looks normal:
[image: image.png]

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:
[image: image.png]

Here is the oxygen concentration of the AMOC cross-section in equilibrium:
[image: image.png]

Here is the oxygen concentration after the hosing:
[image: image.png]

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.

Has anyone else seen this behavior? Any suggestions for tests I can run to
figure out what's wrong?

Thanks,
Yuxin
-- 
Yuxin Zhou
https://www.ldeo.columbia.edu/~yzhou/
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