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MOM6.md

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MOM6 Grids

FMS Notes

References:

The Flexible Modeling System operates from the same directory (INPUT). This is defined in MOM_input variable INPUTDIR. The MOM_input file is defined in input.nml.

The top level file is the grid_spec.nc. This file links to three types of files:

  • Mosaics
  • Ocean topography
  • Exchange grid files

Mosaics

A quick setup entails using the same ocean_mosaic.nc file for atmosphere, land and ocean mosaics.

  • atm_mosaic_file = ocean_mosaic.nc
  • lnd_mosaic_file = ocean_mosaic.nc
  • ocn_mosaic_file = ocean_mosaic.nc
  • All should reside in the INPUT directory and the mosaics should specify the directory as ./.

Ocean topography

The ocean topographic file can be named anything, but the default name is ocean_topog.nc.

  • ocean_topog_file = ocean_topog.nc
  • This file typically resides in the INPUT directory which is specified using ./.

Exchange grid files

For the quick case, three files are specified for tile1. The general pattern is:

  • atmos X land
  • atmos X ocean
  • land X ocean

The included points are usually correspond to those requested in the 2nd element. The land points are exchanged in atmosXland and the ocean points are exchanged in atmosXocean and landXocean.

ocean_mosaic.nc

This defines the name of the mosaic without the extension: ocean_mosaic. The gridlocation defines the location of this file which should reside in the INPUT directory and should be specified as ./.

Each mosaic then points to respective gridfiles and gridtiles. In the quick case, there is only one of each.

  • gridfiles = ocean_hgrid.nc
  • gridtiles = tile1

MOM6 Notes

Within the netCDF file for MOM6 grids the following descriptions of variables and dimensions:

  • Dimensions
    • nx, ny : grid centers
    • nxp, nxp : grid verticies

Nomenclature

  • The supergrid is twice the horizonal resolution.
  • The supergrid contains all the staggered points, but the model only solves equations for the actual grid.
  • When talking about the resolution of a MOM6 grid, the convention is to talk about the resolution of the grid not the supergrid.