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MPAS Version 6.0
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@matthewhoffman matthewhoffman released this 17 Apr 21:04
· 1217 commits to master since this release
v6.0
ece5f71

This major release of MPAS introduces the MPAS-Seaice core, and it includes new
functionality, general improvements, and fixes to the Ocean, Land Ice, and
Atmosphere cores. Also included are various small improvements, optimizations,
and clean-up in the shared software infrastructure. Specific changes to each of
the MPAS components are detailed below.

Framework:

  • Introduction of a new module for logging messages during model execution.
    Unless any errors are encountered, MPAS cores now write a single log file,
    named log.<core>.0000.out. In case errors occur, each MPI task will write
    its own error log file named log.<core>.<task ID>.err.
  • Performance enhancements to aggregated halo exchanges used in the Ocean,
    Land-ice, and Sea-ice cores.
  • Minor enhancements to the MPAS "stream manager", including the ability to
    specify "final_only" for the "input_interval" or "output_interval" of a stream
    to read/write that stream only at the model stop time.
  • Various bug-fixes and other clean-up to ensure that the framework can be used
    in coupled-model configurations involving more than one MPAS core.

Atmosphere:

Relative to the v5.0 release, the MPAS v6.0 release represents a minor
increment in capability for the MPAS-Atmosphere core. MPAS-Atmosphere v6.0
includes:

  • An increase of the default number of layers from 41 to 55 to match
    the standard experimental set-up used at NCAR.
  • The addition of support for the use of GMTED2010 terrain elevation,
    matching the default terrain dataset used in the WRF model.
    • Set config_topo_data = 'GMTED2010' in the namelist.init_atmosphere file
      when interpolating static fields.
  • Computation of the GWDO sub-grid-scale orography fields in a way that is more
    consistent with the pre-computed fields used in the WRF model.
  • Support for parallel builds of the init_atmosphere and atmosphere cores.
    • Use make -j N ....
  • A significant reduction in the size of model initial conditions files.

Land Ice:

The last MPAS release with land ice improvements was v3.0. MPAS v6.0 adds the
following significant features relative to v3.0:

  • Adds support for the First-Order velocity solver through the external Albany
    library.
  • Adds a thermal solver that can be solved in terms of temperature (verified)
    or enthalpy (experimental).
  • Adds subglacial hydrology model.
  • Adds a number of calving options including eigencalving.
  • Adds an adaptive time stepper.
  • Adds analysis members for global and regional statistics.
  • Ability to couple with E3SM.
  • Adds a number of test cases and model configurations.
  • General cleanup and bug fixes.

Ocean:

  • Ability to couple with E3SM.
  • New in-situ analysis computations.
  • Division of tracers into groups to control output, algorithms, and forcing.
  • Addition of biogeochemistry tracers and column computations.

Sea Ice:

  • First release of MPAS-Seaice.
  • MPAS-Seaice solves the sea-ice momentum equation with an
    Elastic-Viscous-Plastic rheology and variational horizontal operators adapted
    for the MPAS mesh.
  • Horizontal transport of mass and tracers uses an incremental remapping scheme.
  • Column physics and biogeochemistry uses an early version of the Icepack
    library.
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