AR4 Climate Change 2007: The Physical Science Basis


This Working Group I contribution to the IPCC’s Fourth Assessment Report (AR4) provides a comprehensive assessment of the physical science of climate change and continues to broaden the view of that science, following on from previous Working Group I assessments. The results presented here are based on the extensive scientific literature that has become available since completion of the IPCC’s Third Assessment Report, together with expanded data sets, new analyses, and more sophisticated climate modelling capabilities.

Front Matter
Summary for Policymakers
Technical Summary


Historical Overview of Climate Change Science
Changes in Atmospheric Constituents and in Radiative Forcing
Observations: Surface and Atmospheric Climate Change
Observations: Changes in Snow, Ice and Frozen Ground
Observations: Oceanic Climate Change and Sea Level
Couplings Between Changes in the Climate System and Biogeochemistry
Climate Models and Their Evaluation
Understanding and Attributing Climate Change
Global Climate Projections
Regional Climate Projections

Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, 2007 Solomon, S., D. Qin, M. Manning, Z. Chen, M. Marquis, K.B. Averyt, M. Tignor and H.L. Miller (eds.) Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.

Uncertainty Guidance Note for the Fourth Assessment Report
Figures Showing Individual Model Results for Different Climate Variables

Supplementary Material

3 – Observations: Surface and Atmospheric Climate Change – Supplementary Material – Appendix 3.B: Techniques, Error Estimation and Measurement Systems
6 – Palaeoclimate – Supplementary Material – Appendix 6.A. Glossary for Terms Specific to Chapter 6
8 – Climate Models and Their Evaluation – Supplementary Material – Appendix 8.A. Supplementary Figures and Tables
9 – Understanding and Attributing Climate Change – Supplementary Material – Appendices & References
10 – Global Climate Projections – Supplementary Material
11 – Regional Climate Projections – Supplementary Material

SPM in UN and other languages

Other Languages

A number of countries have undertaken translations of the SPMs into languages that are not official languages of the United Nations. IPCC welcomes these initiatives but would note that the translations have been prepared under the responsibility of the respective country or institutions. The IPCC does not assume any responsibility for the accuracy of these translations into non-UN languages. In working to achieve the widest possible dissemination of IPCC knowledge, the IPCC is pleased to assist in making these translations available.