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Isopycnal Diffusivity in the ocean
Lowering the strength of isopycnal diffusivity was suggseted during a conversation with Jonathan and Willem Sijp as being likely to reduce the warm bias found throughout the Southern Ocean. A reduction of 25% didn’t do much, but reducing it to 50% seemed to cool the SO at the surface and below the depth of the NADW intrusion - which did get slightly stronger, causing some warming at mid-depth.
This is a currently being tested as a useful tuning parameter, especially in combination with the Free-drifting sea ice scheme.
Till Kuhlbrodt@Reading is, additionally, looking at how the GM parameters affect the ACC, along with assessing how the inclusion of the spatial-dependent Visbeck parameterisation of the GM coefficients affect FAMOUS.