Working Group I (IPCC)
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| Working Group I (IPCC) | |
|---|---|
| Name | Working Group I (IPCC) |
| Formation | 1988 |
| Type | Scientific assessment body |
| Headquarters | Geneva |
| Parent organization | Intergovernmental Panel on Climate Change |
Working Group I (IPCC) Working Group I assesses the physical science basis of climate change, synthesizing evidence from observational networks, theoretical studies, and numerical models produced by groups such as National Aeronautics and Space Administration, European Centre for Medium-Range Weather Forecasts, and Max Planck Institute for Meteorology. Its assessments inform policymakers represented in bodies like the United Nations Framework Convention on Climate Change, the G77 and China, and the European Union by providing consensus statements grounded in the literature of institutions including Massachusetts Institute of Technology, California Institute of Technology, and Chinese Academy of Sciences.
Overview
Working Group I produces comprehensive assessments on the physical science of climate, drawing on literature from publishers and organizations such as Nature, Science (journal), and the American Geophysical Union. Its reports evaluate evidence from measurement programs like Argo (oceanography), Global Precipitation Measurement, and Integrated Ocean Observing System, and from modeling centers such as Hadley Centre, NOAA Geophysical Fluid Dynamics Laboratory, and Institute Pierre-Simon Laplace. The outputs are used by negotiators at events like the Conference of the Parties, scientists at meetings such as the World Climate Research Programme conferences, and funders including the World Bank.
History and development
Established alongside the Intergovernmental Panel on Climate Change in 1988 by the World Meteorological Organization and the United Nations Environment Programme, the group has evolved through assessment cycles culminating in reports released in years including 1990, 1995, 2001, 2007, 2013–2014, and 2021–2022. Notable milestones involved collaborations with projects such as the Paleoclimate Modelling Intercomparison Project and responses to events like the Mount Pinatubo eruption and the Arctic sea ice decline. Contributors have included authors affiliated with Scripps Institution of Oceanography, Columbia University, University of Oxford, and University of Tokyo, and the group’s processes have been shaped by lessons from controversies around the Climatic Research Unit and inquiries related to the United Kingdom Parliament.
Mandate and scope
The mandate, set by the Intergovernmental Panel on Climate Change plenary and shaped by guidance from the United Nations General Assembly, is to provide objective, policy-relevant but not policy-prescriptive assessments of physical science of climate. Scope covers detection and attribution of change, radiative forcing estimates drawing on work by James Hansen and Syukuro Manabe-influenced modelling traditions, projections based on scenarios such as the Representative Concentration Pathways and Shared Socioeconomic Pathways, and paleoclimate records assembled from studies at Vostok Station, Greenland ice sheet, and Loch Lomond. Outputs are structured to inform entities including the Organisation for Economic Co-operation and Development and national agencies like the Met Office.
Assessment reports and major findings
Major reports synthesize thousands of studies and have produced consensus findings: increasing concentrations of greenhouse gases measured at Mauna Loa Observatory and attributed through detection studies to anthropogenic emissions linked to fossil fuel extraction industries and events like the Industrial Revolution; observed warming trends documented by datasets from GISS, HadCRUT, and Berkeley Earth; and projections of sea level rise informed by research on the Antarctic ice sheet and Greenland ice sheet. Key conclusions align with assessments by United States Global Change Research Program and with impacts examined in reports by IPBES. The Sixth Assessment Report highlighted human influence on every major climate system component, integrating paleoclimate reconstructions from EPICA and recent observations from Sentinel-6.
Methodology and processes
Assessment methodology relies on systematic literature review, expert author teams drawn from universities and research centers such as ETH Zurich, Princeton University, and CSIRO, and iterative drafting with multiple rounds of review by governments and experts including representatives from National Oceanic and Atmospheric Administration and European Space Agency. The process uses established procedures from the IPCC approved by plenary sessions alongside guidance documents like the IPCC Principles. Chapters synthesize findings from model intercomparison projects such as CMIP and observational syntheses from programs like GCOS and GRACE. Confidence language and likelihood terminology are applied following frameworks influenced by the National Research Council.
Membership and governance
Authors and review editors are nominated by governments and observer organizations including World Bank and Greenpeace International and are selected to represent disciplines across institutions such as University of California, Berkeley, Peking University, and University of Cape Town. Governance is exercised through IPCC plenary sessions composed of delegations from Member States of the United Nations, with technical support from the IPCC Secretariat hosted by the World Meteorological Organization and the United Nations Environment Programme. Bureau members and chairs have included scientists affiliated with University of Cambridge, University of Bern, and University of Melbourne.
Interactions with other IPCC Working Groups and scientific bodies
Working Group I interacts closely with Working Group II and Working Group III through shared scenarios like the Shared Socioeconomic Pathways and cross-cutting chapters coordinated with bodies such as the WMO, UNEP, and the Food and Agriculture Organization. It collaborates with scientific programs including the Intergovernmental Oceanographic Commission, the International Energy Agency, and the International Arctic Science Committee to align observations, model output from CMIP exercises, and policy-relevant information used by negotiators at the Conference of the Parties and analysts at institutions such as the International Monetary Fund and World Health Organization.