What is SIMA
The SIMA project seeks to construct a unified community atmospheric modeling system, for use in an Earth System Model (ESM), that enables diverse configurations for applications spanning minutes to centuries and global scales to cloud scales, including atmospheric forecasts and projections of the atmospheric state and composition from the surface to the thermosphere.
There is now pressure for modeling systems with capabilities for broader, more comprehensive application. The community would benefit immensely by having a unified atmospheric modeling system serving as a tool for the study of cross-disciplinary problems and enabling coupling to other Earth system component models. SIMA seeks to construct a unified community atmospheric modeling system, for use in an Earth System Model (ESM), that enables diverse configurations for applications spanning minutes to centuries and global scales to cloud scales, including atmospheric forecasts and projections of the atmospheric state and composition from the surface to the thermosphere. See the SIMA Vision document for more details.
History of SIMA
NCAR advisory panels and Site Visit Teams over the last 3 years have recommended that NCAR unify and integrate the atmospheric modeling efforts that are distributed to the community.
In response to this, NCAR and the community have developed a vision for the next generation of community models for the atmosphere: SIMA, the System for Integrated Modeling of the Atmosphere. The primary goal of the 'SIMA' system is to be able to conduct frontier science simulations in climate, weather and geospace research using the same modeling system.
The initial SIMA vision development arose from the Singletrack project, and featured a large number of NCAR staff and selected community participants. This project ran from January - December 2018 and developed a 'Vision document and Roadmap' that became SIMA. We have started some initial explorations of different options in a 'SIMA version 0' (SIMAv0) using extensions to our existing modeling systems.
SIMA planning process started
2019 - 2020
Development of SIMA V0
SIMA community workshop
Development of SIMA V1
Target date for SIMA V1 release to community
Jan. - May. 2018
Organized, developed science goals, applications: Singletrack project
Jun. - Aug. 2018
Develop a ‘Roadmap’, Solicit Community Feedback
Oct. - Dec. 2018
Singletrack Roadmap available. More feedback (CESM/UCAR Members), name change to ‘SIMA’
Jan. - Feb. 2019
SIMA Terms of Reference, CESM CAB presentation
SIMA version 0 reinvestment project
Aug. - Dec. 2019
SIMA Version 0 Development
SIMA Community Workshop
SIMA Version 1 Developments
Target applications in SIMA framework (end of CY21)
SIMA is currently developing Applications that are scheduled to be released to the community in Fall of 2021. The image below shows the latest application table.
SIMAv0 advanced and integrated various NCAR modeling systems. Efforts included the following.
- SIMAv0 Chemistry: A new portable and robust infrastructure for building and maintaining chemistry schemes was developed, as well as a regionally-refined chemical model setup for running over the US at 14 km.
- SIMAv0 Geospace: The current dynamical cores were extended to the thermosphere, and coupling to a geomagnetic grid was enabled.
- SIMAv0 Polar: A refined-mesh configuration of CESM2 with 14-km resolution over the Arctic and Greenland was developed for community use.
- SIMAv0 Climate: A 14-km refined CESM2 mesh for the U.S. was developed for the community and a Refined Mesh Toolkit made available for mesh generation.
- MPAS in CESM: The non-hydrostatic MPAS dynamical core was integrated into CESM to enable global, cloud-scale simulation with access to the Earth system components of CESM. In addition, implementation began of the Common Community Physics Package (CCPP) into CAM/CESM to allow easy access to CCPP-compliant physics schemes, including those from WRF and MPAS.