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Agenda Notes Monday April 16th 2018 11:00 AM
Date: 16 April 2018
Time: 11:00 MDT / 19:00 CET
Call-in number: 1-866-740-1260
Access Code: 4978161
- Review status of
release-v6.0
branch - Framework modifications:
- Webpage: https://github.com/MPAS-Dev/mpas-dev.github.com
Monday 9 April 2018 @ 11:00 MDT
Participants: Adrian, Matt, Mark, Michael
- Maybe one more change needed in the
Makefile.ACME
file, but otherwise, we should be on track for a release tomorrow (Tuesday) - General agreement that we should try using a detailed set of release notes for the annotation of the
v6.0
tag- Will GitHub automatically use this for the release notes on the Releases page?
- Updates to the mpas-dev.github.io page can be made by cloning/committing/pushing to the corresponding git repository
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 namedlog.<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.
- Set
- 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
andatmosphere
cores.- Use
make -j N ...
.
- Use
- 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.