Table 1 26 settings of perturbed physics (combinations of settings of the convection scheme, cloud microphysics and boundary layer scheme) to produce the 64-member ensemble

From: Extreme event attribution using km-scale simulations reveals the pronounced role of climate change in the Durban floods

Convection/cloud/boundary layer settings

Physical meaning

[acon, bcon] = [0, 0.02] vs [0.2, 0.1]

These affect the apportionment of cloud cover contributions from shallow and deep convection.

[tied_over] = 2626 vs 2499

Two choices for the scale-awareness behavior. For small grid lengths, the first one gives stronger parameterized convection than the second.

methdetr = -1 vs -5

Two different reference detrainment profiles.

Nclddia = 12 vs 3

Two different formulae for calculating cloud fraction from the environment mixing ratios and liquid water concentrations.

Cloud = 1 vs 0

Cloud microphysics for liquid, ice and rain; cloud microphysics for liquid and ice only.

Bmx = 0 vs 1

Richardson boundary layer parameterization vs Turbulent Kinetic Energy parameterization.

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