Currently, advection of momentum is always done by leapfrog centered advection with periodic 'mixing' steps. For tracer advection, three options are available. The first is standard leapfrog centered advection; the second is a 3rd-order upwinding [Leonard] which, although not monotone, will improve monotonicity at a somewhat increased computational cost, and the third, available only in CESM1 POP2, is a one-dimensional Lax-Wendroff with one-dimensional flux limiters.
| &advect_nml | LANL default |
CESM1 dipole-grid default |
CESM1 tripole-grid default |
Valid values |
Advection methods for tracers |
| tadvect_ctype | 'centered' | 'upwind3' | 'centered' | 'centered', 'upwind3', 'lw_lim' | centered differences, 3rd-order upwinding or 1-D Lax-Wendroff with 1-D flux limiters |
| / |