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| NCAR CCSM | |
|---|---|
| Name | Community Climate System Model |
| Acronym | CCSM |
| Developed by | National Center for Atmospheric Research, National Science Foundation |
| Initial release | 1996 |
| Latest release | 2004 (CCSM3) / 2010s (successors) |
| Programming languages | Fortran, C, C++ |
| Platforms | Cray, IBM, Sun Microsystems, Intel-based clusters |
| License | Academic/open research |
NCAR CCSM The Community Climate System Model was a coupled climate modeling framework developed at the National Center for Atmospheric Research with major contributions from the National Science Foundation, designed to simulate interactions among the atmosphere, ocean, cryosphere, and land surface for use in climate research, seasonal forecasting, and paleoclimate studies. CCSM integrated component models to study climate variability, forcings, and feedbacks relevant to institutions such as the Intergovernmental Panel on Climate Change, NOAA, and numerous university research groups. The project influenced successor efforts at centers including the Geophysical Fluid Dynamics Laboratory, the Hadley Centre, and the European Centre for Medium-Range Weather Forecasts.
CCSM was conceived as a community resource linking component models for the atmosphere (community atmosphere model lineage), ocean (Parallel Ocean Program lineage), sea ice (CICE ancestry), and land surface (Community Land Model ancestry). It provided a platform for experiments related to El Niño–Southern Oscillation, Atlantic Meridional Overturning Circulation, glacial cycles, volcanic eruption forcing, and anthropogenic greenhouse gas scenarios often cited by the Intergovernmental Panel on Climate Change. CCSM releases (CCSM1–CCSM3) became reference models for multimodel intercomparison projects organized by the World Climate Research Programme and the Coupled Model Intercomparison Project.
The CCSM architecture coupled several distinct component models: the atmospheric model derived from the Community Atmosphere Model has ties to work at NCAR and University Corporation for Atmospheric Research scientists; the ocean model was based on the Parallel Ocean Program developed at Los Alamos National Laboratory and scientific collaborations with Scripps Institution of Oceanography; the sea ice component drew on the CICE model developed at Los Alamos National Laboratory and University of Washington groups; the land model evolved from the Community Land Model with inputs from University of Colorado, Oak Ridge National Laboratory, and Lawrence Berkeley National Laboratory. CCSM included modules for biogeochemistry and chemistry informed by researchers at Woods Hole Oceanographic Institution, Jet Propulsion Laboratory, and Columbia University.
Initial efforts began in the 1990s at NCAR under funding from the National Science Foundation and collaborations with DOE laboratories, culminating in CCSM1. Subsequent major versions—CCSM2 and CCSM3—incorporated advanced parameterizations influenced by projects at the Hadley Centre and methodologies from the Geophysical Fluid Dynamics Laboratory. CCSM development involved contributors from Princeton University, Massachusetts Institute of Technology, University of Washington, University of California, Berkeley, and University of Miami. The project transitioned into the Community Earth System Model with engagement from international partners including Max Planck Institute for Meteorology and Institut Pierre-Simon Laplace scientists.
Researchers used CCSM for attribution studies of 20th-century climate change, projections for regional impacts assessed by agencies such as NOAA and EPA, investigation of paleoceanography (e.g., Last Glacial Maximum experiments), and exploration of abrupt climate events like Younger Dryas analogs. CCSM experiments contributed to IPCC assessment reports and supported collaborations with field programs run by National Oceanic and Atmospheric Administration, United States Geological Survey, and NASA missions such as those at Goddard Space Flight Center. The model underpinned studies on monsoon dynamics, Arctic amplification, sea level rise projections, and carbon cycle feedbacks relevant to Intergovernmental Panel on Climate Change scenarios.
CCSM performance was evaluated against observations from networks and programs like Global Precipitation Climatology Project, Argo, TOGA, and satellite records from NASA missions and European Space Agency sensors. Model skill assessments compared CCSM output with reanalyses from NCEP and ECMWF, and diagnostics used workflows developed by research groups at Lamont–Doherty Earth Observatory and NOAA Geophysical Fluid Dynamics Laboratory. CCSM participated in multimodel comparison projects organized by the World Climate Research Programme and benchmarks influenced by methods from the International CLIVAR Project.
CCSM employed a coupler to exchange state variables and fluxes among components, drawing on software engineering practices developed at NCAR and influenced by tools used at Los Alamos National Laboratory and Argonne National Laboratory. The codebase used Fortran for physics kernels, with C/C++ utilities and parallelization via MPI implementations from vendors such as Cray and IBM and later on commodity Intel clusters. Development workflows integrated version control systems and testing practices common at National Center for Atmospheric Research and university partners, and visualization/analysis pipelines interfaced with tools from UCAR and community packages developed at University of Colorado groups.
Critiques of CCSM focused on resolution constraints compared to regional models used at Lawrence Livermore National Laboratory and the need for improved parameterizations highlighted by studies at MIT and Princeton University. Limitations included biases in tropical precipitation documented by researchers at Columbia University, sea ice representation issues noted by University of Washington teams, and uncertainties in carbon cycle coupling raised by groups at Oak Ridge National Laboratory and Woods Hole Oceanographic Institution. Computational costs and complexity prompted transitions to successor frameworks and influenced community debates held at meetings of the American Geophysical Union and American Meteorological Society.
Category:Climate models