ACCESS-CM2: changes in access-cm2-drivers from fcm_make_drivers

[Aidan (Aidan Heerdegen, ACCESS-NRI Release Team Lead)]

@ars599

In CM2, at some point, possibly due to chaos, the grid point near Sumatra Island, at a depth of 400m, experiences an enormous current, which suddenly alters the circulation in the Indian Ocean

Maybe a bit off topic, but are you using Rayleigh damping @ars599?

From the ACCESS-OM2 technical paper

At 1^∘ Rayleigh damping is used to improve the Indonesian throughflow transport; a damping timescale of 1.5 h is applied at all but the bottom two (three) U cells in Lombok (Ombai) Strait and for 3 ∕ 4 of the width of the Torres Strait at all depths. At 0.1^∘ a damping timescale of 1.5 h is used at all depths across the full width of Kara Strait to constrain the velocity, which otherwise leads to numerical instability unless an unfeasibly small time step is used. There is no Rayleigh drag in the 0.25^∘ configuration.

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