Richardson-number mixing

The Pacanowski and Philander [PacanowskiPhilander] mixing scheme was developed primarily for use in tropical ocean and, although it is often used elsewhere in the global ocean, the user should be aware of the possible need to adjust its parameters ([Peters et al],[Gent]).

Table: Richardson-number vertical mixing namelist

&vmix_rich_nml	LANL default	CESM1 default	Richardson-number mixing (Pacanowski-Philander)
bckgrnd_vvc	1.0	1.0	background vertical viscosity (cm2/s)
bckgrnd_vdc	0.1	0.1	background vertical diffusivity (cm2/s)
rich_mix	50.0	50.0	coefficient for Richardson-number function
/