The pressure-averaging technique was explained in a previous section. Because it increases the timestep, it should always be enabled. The option to turn it off is provided only to permit comparisons with and without pressure-averaging or between POP and other codes that do not incorporate this technique.
The pressure gradient term includes a density factor which is assumed to be a constant reference density in Boussinesq models. The depth-dependent pressure effects on this density can be corrected for using simple depth-dependent factors.
| &pressure_grad_nml | LANL default |
CESM1 default |
Valid values |
Averaging of horizontal pressure gradient |
| lpressure_avg | .true. | .true. | .true., .false. | use pressure averaging to increase time step |
| lbouss_correct | .true. | .false. | .true., .false. | applies depth-dependent factor to correct for assumed constant density |
| / |