Contact:  Stephen M. Griffies ,  Alistair Adcroft
Reviewers: 
Change History: WebCVS Log

This module setups various passive tracer configurations. Some idealized initial conditions are provided.

These tracers are used for various idealized purposes, such as tracing water mass transports, testing advection schemes, etc.

These passive tracers are always initialized within this module with an idealized profile. No preprocessing step is required. To define a common initial condition for all passive tracers use the namelist "ocean_passive_nml"

This setting can be overwritten for each tracer by the namelist feature of the tracer field_table. For example

"namelists","ocean_mod","ocean_passive/patch" restore = f init_condition = temp_sq_init

init_condition is one of :: 'level', 'wall','patch', 'patch_'klevel, with "klevel" an integer for the k-level that will place the patch. 'exponential', 'shelfbowl', 'rho_surface', 'temp_sq_init', 'salt_sq_init' Default is 'patch'

With rho_surface' a density surface can be selected, the density value is defined in the field table namelist, for example

init_surface = 1025

However, if an initial file exists for a passive tracer, then ocean_tracer_mod will overwrite the passive tracer with the tracer concentration in the initial file. In this way, we can, for example, initialize a passive tracer with some profile that is not readily determined via a simple algorithmic procedure.

If restoring of a passive tracer to its initial value is enabled by setting in the field table

restore = t

the initial field is used only to find the grid cells where to restore the passive tracer to the initial tracer field. Restoring is done where the tracer concentration exceeds 0.00001. The inital value of passive tracers with restoring is always set to '1'. With the field_table namelist

init_value = some_real

this can be changed to another but also constant value.

All passive tracers in this module are dimensionless and are treated the same internally to this module. However, they can generally have different initial conditions and can use different advection schemes. Indeed, one motivation for developing this module is to test advection schemes, with the same initial condition used for each of the tracers, but different advection schemes. In this way we can readily determine the difference between advection schemes on various profiles within mom4p1.

Sample passive tracers are setup here. The user can modify code in a straightforward manner to change the number of passive tracers and/or the initial profiles.

     constants_mod
 field_manager_mod
       fm_util_mod
           fms_mod
           mpp_mod
 ocean_domains_mod
ocean_tpm_util_mod
   ocean_types_mod

ocean_passive_init:

passive_tracer_init:

ocean_passive_tracer_init:

surface_init:

layer_init:

wall_init:

patch_init:

patch_init_klevel:

exponential_init:

shelfbowl_init:

update_tracer_passive:

None.

&ocean_passive_nml

None.

None.

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