CLIVAR

CLIVAR
Name	CLIVAR
Formation	1995

CLIVAR is an international research programme focused on understanding variability and predictability of the climate system on seasonal to centennial timescales through coordinated observational, modeling, and theoretical studies. It coordinates efforts among national and international bodies to improve knowledge of phenomena such as the El Niño–Southern Oscillation, the Atlantic Meridional Overturning Circulation, and decadal variability, linking studies across oceanography, atmospheric science, and coupled climate modeling. CLIVAR activities connect scientists from programs and institutions involved with long-term climate observation, numerical simulation, and climate services.

Overview

CLIVAR coordinates multinational research on oceanic and atmospheric components of climate variability through partnerships with World Climate Research Programme, Intergovernmental Panel on Climate Change, World Meteorological Organization, National Aeronautics and Space Administration, National Oceanic and Atmospheric Administration, European Centre for Medium-Range Weather Forecasts, UK Met Office, and regional programs such as SPOR and Asian Monsoon Years. Emphasis areas include tropical variability (for example, El Niño–Southern Oscillation and Indian Ocean Dipole), extratropical variability (including North Atlantic Oscillation and Pacific Decadal Oscillation), and coupled processes like air–sea interaction and ocean circulation that influence phenomena such as Atlantic Multidecadal Variability and Southern Annular Mode. CLIVAR links observational networks managed by institutions like Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Jet Propulsion Laboratory, CSIRO, and NOAA Pacific Marine Environmental Laboratory.

History and development

The programme emerged in 1995 under the umbrella of the World Climate Research Programme alongside initiatives such as GEWEX and SPARC to build on earlier efforts including TOGA and WOCE. Early milestones involved integrating measurements from projects run by Scripps Institution of Oceanography, Lamont–Doherty Earth Observatory, National Oceanography Centre, Ifremer, Plymouth Marine Laboratory, and GEOMAR. Workshops and panels with participation from scientists affiliated with University of Washington, University of Southampton, Massachusetts Institute of Technology, Princeton University, Columbia University, and University of Tokyo set priorities for sustained observations, modeling intercomparisons, and process studies. Major international meetings occurred in venues such as Boulder, Colorado, Geneva, Plymouth, Sydney, and Vigo where representatives from agencies including NASA, NOAA, European Commission, DFG, and NSF coordinated funding strategies.

Scientific objectives and research themes

Core objectives include understanding mechanisms of seasonal-to-decadal predictability, quantifying the role of the ocean in climate modulation, and improving coupled model representations to inform assessment bodies such as the Intergovernmental Panel on Climate Change. Research themes span tropical dynamics (involving El Niño–Southern Oscillation, Madden–Julian Oscillation, and Indian Ocean Dipole), midlatitude teleconnections (involving North Atlantic Oscillation, Pacific North American pattern, and Southern Annular Mode), and upper-ocean processes including western boundary currents like the Gulf Stream and Kuroshio Current. Studies address interactions with cryospheric features such as Antarctic Circumpolar Current and Arctic Oscillation, and with biogeochemical cycles studied by teams at Monterey Bay Aquarium Research Institute and Alfred Wegener Institute. Efforts contribute to predictability research linked to agencies like European Space Agency and JAXA.

Observing systems and data resources

CLIVAR relies on sustained observing systems including the Argo float array, the TAO/TRITON array, the Global Drifter Program, ship-based programs such as VOS and WOCE Hydrographic Programme, satellite missions from TOPEX/Poseidon, Jason series, ERS, ENVISAT, and data assimilation centers like ECMWF and NCEP. Data repositories and analysis centers include NOAA National Centers for Environmental Information, PANGAEA, British Oceanographic Data Centre, Scripps Institution of Oceanography archives, and the International CLIVAR Project Office archives. Collaboration with programs such as GCOS, GOOS, Argo, OceanSITES, and IOCCP ensures integration of in situ and remote-sensing datasets used in evaluation of models developed by groups at GFDL, Met Office Hadley Centre, CNRM, ECMWF, and NCAR.

Modeling and prediction efforts

CLIVAR has driven coordinated model intercomparisons, forecast experiments, and targeted sensitivity studies carried out by modeling centers including GFDL, NCAR, Hadley Centre, CNRM, MRI (Meteorological Research Institute), JMA, NOAA Geophysical Fluid Dynamics Laboratory, IAP (Institute of Atmospheric Physics, China), and LASG. Activities include participation in the Coupled Model Intercomparison Project experiments informing IPCC assessments, designed seasonal-to-decadal prediction systems, initialized hindcasts and retrospective forecast ensembles, and process-level simulations addressing air–sea fluxes, ocean mixing, and mesoscale eddy dynamics. Model evaluation uses metrics developed with observational partners like Scripps Institution of Oceanography, Jet Propulsion Laboratory, and NOAA to benchmark skill in reproducing phenomena such as El Niño–Southern Oscillation amplitude, phase locking, and decadal shifts.

International structure and working groups

The programme operates through regional panels and thematic working groups involving institutions such as International CLIVAR Project Office, CLIVAR Atlantic Panel, CLIVAR Pacific Panel, and CLIVAR Indian Ocean Panel, with contributors from Universities Space Research Association, NOAA, NASA, ECMWF, Met Office, CSIRO, Ifremer, and national academies including Royal Society and National Academy of Sciences. Working groups focus on topics such as observational design, data management, modeling, paleoceanography involving Lamont–Doherty Earth Observatory, and process studies coordinated with programs like SPARC and GEWEX. Steering committees and task forces bring together representatives from UNESCO, IOC (UNESCO) programs, and bilateral initiatives to align research priorities and resource commitments.

Impact, applications, and legacy

CLIVAR contributions have influenced assessment reports by the Intergovernmental Panel on Climate Change, operational seasonal forecasting at NOAA, impacts studies used by agencies such as European Commission and World Bank, and regional climate services developed by national meteorological services including UK Met Office, JMA, and Bureau of Meteorology (Australia). Legacy outcomes include improved observing networks like Argo, enhanced model initialization techniques informing decadal prediction efforts, and capacity-building through training workshops at institutions such as Scripps Institution of Oceanography, Plymouth Marine Laboratory, and University of Cape Town. The programme's coordinated approach has links to successor and partner initiatives within the World Climate Research Programme and broader Earth system science community.

Category:Climate research organizations