*Set MAX_TR_DIFFUSION_CFL = 2.0 in OM4_05

  Set the new run-time parameter, MAX_TR_DIFFUSION_CFL, which limits the
along-layer tracer mixing in OM4_05 and Baltic_OM4_05. This changes the
MOM_parameter_doc files in both cases and the answers in OM4_05.

ice_ocean_SIS2/Baltic_OM4_05/MOM_input

@@ -835,6 +835,11 @@ CHECK_DIFFUSIVE_CFL = True      !   [Boolean] default = False
                                 ! If true, use enough iterations the diffusion to ensure
                                 ! that the diffusive equivalent of the CFL limit is not
                                 ! violated.  If false, always use 1 iteration.
+MAX_TR_DIFFUSION_CFL = 2.0      !   [nondim] default = -1.0
+                                ! If positive, locally limit the along-isopycnal tracer
+                                ! diffusivity to keep the diffusive CFL locally at or
+                                ! below this value.  The number of diffusive iterations
+                                ! is often this value or the next greater integer.
 
 ! === module MOM_neutral_diffusion ===
 ! This module implements neutral diffusion of tracers

ice_ocean_SIS2/Baltic_OM4_05/MOM_parameter_doc.all

@@ -2030,7 +2030,7 @@ CHECK_DIFFUSIVE_CFL = True      !   [Boolean] default = False
                                 ! that the diffusive equivalent of the CFL limit is not
                                 ! violated.  If false, always use the greater of 1 or
                                 ! MAX_TR_DIFFUSION_CFL iteration.
-MAX_TR_DIFFUSION_CFL = -1.0     !   [nondim] default = -1.0
+MAX_TR_DIFFUSION_CFL = 2.0      !   [nondim] default = -1.0
                                 ! If positive, locally limit the along-isopycnal tracer
                                 ! diffusivity to keep the diffusive CFL locally at or
                                 ! below this value.  The number of diffusive iterations

ice_ocean_SIS2/Baltic_OM4_05/MOM_parameter_doc.short

@@ -829,6 +829,11 @@ CHECK_DIFFUSIVE_CFL = True      !   [Boolean] default = False
                                 ! that the diffusive equivalent of the CFL limit is not
                                 ! violated.  If false, always use the greater of 1 or
                                 ! MAX_TR_DIFFUSION_CFL iteration.
+MAX_TR_DIFFUSION_CFL = 2.0      !   [nondim] default = -1.0
+                                ! If positive, locally limit the along-isopycnal tracer
+                                ! diffusivity to keep the diffusive CFL locally at or
+                                ! below this value.  The number of diffusive iterations
+                                ! is often this value or the next greater integer.
 
 ! === module MOM_neutral_diffusion ===
 ! This module implements neutral diffusion of tracers

ice_ocean_SIS2/OM4_05/MOM_input

@@ -855,6 +855,11 @@ CHECK_DIFFUSIVE_CFL = True      !   [Boolean] default = False
                                 ! If true, use enough iterations the diffusion to ensure
                                 ! that the diffusive equivalent of the CFL limit is not
                                 ! violated.  If false, always use 1 iteration.
+MAX_TR_DIFFUSION_CFL = 2.0      !   [nondim] default = -1.0
+                                ! If positive, locally limit the along-isopycnal tracer
+                                ! diffusivity to keep the diffusive CFL locally at or
+                                ! below this value.  The number of diffusive iterations
+                                ! is often this value or the next greater integer.
 
 ! === module MOM_neutral_diffusion ===
 ! This module implements neutral diffusion of tracers

ice_ocean_SIS2/OM4_05/MOM_parameter_doc.all

@@ -2036,7 +2036,7 @@ CHECK_DIFFUSIVE_CFL = True      !   [Boolean] default = False
                                 ! that the diffusive equivalent of the CFL limit is not
                                 ! violated.  If false, always use the greater of 1 or
                                 ! MAX_TR_DIFFUSION_CFL iteration.
-MAX_TR_DIFFUSION_CFL = -1.0     !   [nondim] default = -1.0
+MAX_TR_DIFFUSION_CFL = 2.0      !   [nondim] default = -1.0
                                 ! If positive, locally limit the along-isopycnal tracer
                                 ! diffusivity to keep the diffusive CFL locally at or
                                 ! below this value.  The number of diffusive iterations

ice_ocean_SIS2/OM4_05/MOM_parameter_doc.short

@@ -847,6 +847,11 @@ CHECK_DIFFUSIVE_CFL = True      !   [Boolean] default = False
                                 ! that the diffusive equivalent of the CFL limit is not
                                 ! violated.  If false, always use the greater of 1 or
                                 ! MAX_TR_DIFFUSION_CFL iteration.
+MAX_TR_DIFFUSION_CFL = 2.0      !   [nondim] default = -1.0
+                                ! If positive, locally limit the along-isopycnal tracer
+                                ! diffusivity to keep the diffusive CFL locally at or
+                                ! below this value.  The number of diffusive iterations
+                                ! is often this value or the next greater integer.
 
 ! === module MOM_neutral_diffusion ===
 ! This module implements neutral diffusion of tracers