PUBLIC INTERFACE ~ PUBLIC ROUTINES ~ NAMELIST

Module ocean_overflow_mod

Contact:  S.M. Griffies ,  Michael Bates
Reviewers: 
Change History: WebCVS Log

OVERVIEW

Tracer source from discharging dense shallow water into the abyss at the parcel's depth of neutral buoyancy.

Tracer source from discharging dense shallow water into the abyss at the parcel's depth of neutral buoyancy. Follow the approach of Campin and Goosse (1999), as well as modifications.

OTHER MODULES USED

        constants_mod
     diag_manager_mod
              fms_mod
      mpp_domains_mod
              mpp_mod
    ocean_density_mod
    ocean_domains_mod
 ocean_parameters_mod
ocean_tracer_util_mod
      ocean_types_mod
       ocean_util_mod
  ocean_workspace_mod

PUBLIC INTERFACE

ocean_overflow_init:
overflow:
watermass_diag_init:
watermass_diag:

PUBLIC ROUTINES

  1. ocean_overflow_init

    DESCRIPTION
    Initial set up for mixing of tracers into the abyss next to topography.


  2. overflow

    DESCRIPTION
    Compute thickness and density weighted tracer source [tracer*rho*m/s] due to upstream tracer advection in regions where density-driven overflows are favorable. The MOM implementation of the Campin and Goosse (1999) algorithm is detailed in MOM Elements.


  3. watermass_diag_init

    DESCRIPTION
    Initialization of watermass diagnostic output files.


  4. watermass_diag

    DESCRIPTION
    Diagnose effects from overflow on the watermass transformation.


NAMELIST

&ocean_overflow_nml

use_this_module
For using this module. Default is false.
[logical]
debug_this_module
For debugging
[logical]
overflow_mu
Dissipation rate for the bottom friction. Campin and Goosse suggest overflow_mu=10^-4
[real, units: inverse seconds]
overflow_delta
Fraction of a grid cell participating in the overflow process. Campin and Goosse suggest overflow_delta=1/3.
[real, units: dimensionless]
overflow_umax
Maximum downslope speed.
[real, units: m/s]
do_bitwise_exact_sum
Set true to do bitwise exact global sum. When it is false, the global sum will be non-bitwise_exact, but will significantly increase efficiency. The default value is false.
[logical]
no_return_flow
Set true to remove the Campin and Goose return flow "piping". Default no_return_flow=.false. to recover the standard approach from Campin and Goose.
[logical]

REFERENCES

  1. Campin and Goosse (1999): Parameterization of density-driven downsloping flow for a coarse-resolution model in z-coordinate", Tellus 51A, pages 412-430
  2. S.M. Griffies, M.J. Harrison, R. C. Pacanowski, and A. Rosati A Technical Guide to MOM4 (2003) NOAA/Geophysical Fluid Dynamics Laboratory
  3. S.M. Griffies, Elements of MOM (2012) NOAA/Geophysical Fluid Dynamics Laboratory

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