Table 1.
Parameters, Default Values, and Ranges Perturbed Used in the Perturbed Parameter Ensemble Simulation Design
| Parameter | Description | Lower bound | Default value | Upper bound | Physics scheme |
|---|---|---|---|---|---|
| tau | Timescale for consumption rate of deep CAPE | 1,800 s | 3,600 s | 9,000 s | ZM deep convection |
| dmpdz | Parcel fractional mass entrainment rate | −2.0 × 10−3 | −1.0 × 10−3 | −0.2 × 10−3 | ZM deep convection |
| c0_lnd | Deep convection precipitation efficiency over land | 0 | 5.9 × 10−3 | 0.01 | ZM deep convection |
| ke | Evaporation efficiency of precipitation | 0.1 × 10−6 | 1.0 × 10−6 | 10.0 × 10−6 | ZM deep convection |
| rhminl | Minimum relative humidity for low stable clouds | 0.8 | 0.8875 | 0.99 | Cloud fraction |
| criqc | Maximum updraft condensate | 0.50 | 0.70 | 1.5 | UW shallow convection |
| kevp | Evaporation efficiency | 1.0 × 10−6 | 2.0 × 10−6 | 20.0 × 10−6 | UW shallow convection |