I’m not sure how many people are aware that there is a system in ACCESS-OM2 (actually in YATM) to easily setup forcing perturbation experiments where the atmospheric forcing fields are modified. If you like running experiments like this you really should be!
The system was written by Nic Hannah, Andrew Kiss and others and is described here: Tutorials · COSIMA/access-om2 Wiki · GitHub
It’s quite flexible - a range of additive or multiplicative perturbations to any of the forcing fields that are spatially or temporally dependent/independent (or combinations of these) can be done, without the need to create an entire new copy of the JRA55 (or ERA5, or whatever you’re using) forcing files.
I’ve written up a very brief tutorial on how to do a simple perturbation experiment for a student here: cosima-scripts/ACCESS-OM2_forcing_perturbation_tutorial.ipynb at master · rmholmes/cosima-scripts · GitHub . Note that it was written in a rush since I’m off on leave for a while tomorrow. If someone has the inclination, it would be great to improve on it, expand it to some more complicated cases, make it consistent with current NRI best practice and put it somewhere more accessible.
@cbull maybe this is another candidate for your training series?