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| HadCM3 | |
|---|---|
| Name | HadCM3 |
| Developer | Met Office Hadley Centre United Kingdom |
| Release | 1990s |
| Model type | Coupled atmosphere–ocean general circulation model |
| Resolution | atmosphere ~2.5°×3.75°, ocean ~1.25°×1.25° |
| Components | atmospheric model, ocean model, sea ice, land surface |
| Applications | climate projection, paleoclimate, attribution, IPCC |
HadCM3
HadCM3 is a coupled atmosphere–ocean general circulation model developed by the Met Office Hadley Centre in the United Kingdom in the 1990s. It provided influential simulations for the Intergovernmental Panel on Climate Change assessment reports and shaped research at institutions such as University of Reading, University of Oxford, University of Exeter, NASA, NOAA, and the Max Planck Institute for Meteorology. The model underpinned studies involving the El Niño–Southern Oscillation, Atlantic Meridional Overturning Circulation, Paleocene–Eocene Thermal Maximum, and twentieth-century attribution projects.
HadCM3 combined an atmospheric component originating from the HadAM3 atmosphere model with an ocean component derived from the HadOM3 ocean model, creating a fully coupled system without flux adjustments. It operated at resolutions comparable to contemporary models from NCAR, GFDL, MPI-M, ECMWF, and CSIRO. Widely used by groups at Princeton University, Columbia University, Imperial College London, Scripps Institution of Oceanography, and the University of California, Berkeley, it influenced regional downscaling efforts linked to UK Climate Projections and coordinated experiments under the Coupled Model Intercomparison Project framework.
Development occurred at the Hadley Centre under leadership including staff affiliated with Met Office Chief Scientist roles and collaborations with researchers from University of Reading and University of East Anglia. Design choices were informed by findings from the Climate Variability and Predictability Program, World Climate Research Programme, and methodologies used in models by GFDL CM2, ECHAM, MIROC, and CanESM. The decision to eliminate flux adjustments distinguished it from earlier coupled models like those at GFDL and NCAR. Numerical schemes drew on traditions from Primitive equations solvers used in operational centers such as ECMWF and research groups at Meteorological Office, guided by parameter estimation methods that echo techniques from Bayesian statistics practitioners at Imperial College and London School of Economics affiliates.
The atmospheric core, originally from HadAM3, used a global grid with sigma–pressure vertical coordinates and physical parameterizations for radiation linked to algorithms developed in community models at JPL and NOAA/GFDL. The ocean core from HadOM3 included a free-surface formulation, isopycnal and z-level mixing schemes informed by literature from Woods Hole Oceanographic Institution and Scripps Institution of Oceanography. Sea ice and land surface schemes interfaced with vegetation and hydrology modules similar in spirit to work at Columbia University’s Lamont–Doherty Earth Observatory and University of East Anglia land surface studies. Configuration experiments mirrored protocols later formalized by CMIP and were run on supercomputers at the Met Office and national facilities such as UK National Supercomputing Service, NERSC, and PRACE centers.
HadCM3 contributed to detection and attribution studies published by teams at Hadley Centre, University of Oxford, Stanford University, Harvard University, and Lawrence Berkeley National Laboratory. It produced influential projections used in IPCC Third Assessment Report and subsequent assessments influencing policy discussions at United Nations Framework Convention on Climate Change negotiations and national reports for agencies like DEFRA and Environment Agency. Applications included investigations of sea-level rise drivers by groups at NOAA and University of Hawaii, analyses of monsoon variability involving collaborators from Indian Institute of Tropical Meteorology and Peking University, and historical paleoclimate simulations relevant to work at University of Arizona and University of Cambridge on Last Glacial Maximum dynamics.
Performance evaluation compared HadCM3 output against observations and reanalysis products maintained by ECMWF, NASA/GSFC, NOAA/NCEP, and datasets curated by HadCRUT teams and Berkeley Earth. Metrics included representation of jet stream behavior, tropical modes like El Niño–Southern Oscillation, midlatitude storm tracks studied by researchers at NCAR and University of Washington, and ocean circulation features such as the Atlantic Meridional Overturning Circulation analyzed by Woods Hole Oceanographic Institution and GEOMAR. Intercomparisons with models from MPI-M, GFDL, CNRM, CSIRO, BCC, and MIROC informed model development cycles and tuning strategies used by the Hadley Centre and allied institutions.
HadCM3’s architecture and scientific output directly influenced successor models at the Hadley Centre, including the HadGEM family used in later CMIP phases and applications by groups at UK Met Office, University of Reading, and Met Éireann. Its open dissemination to research partners enabled contributions to multi-model ensembles assembled by IPCC Working Group I authors and facilitated advances in regional climate modelling pursued at Met Office Hadley Centre Regional Model projects. The model’s legacy persists in pedagogy at universities like University of Exeter and University of East Anglia and in methodological lineages adopted by national modelling centers such as NOAA, NASA, CMA, and Environment and Climate Change Canada.
Category:Climate models