The IPCC AR5 guidance note on consistent treatment of uncertainties: a common approach across the working groups

• Published in: Climatic change Vol. 108; no. 4; pp. 675 - 691
• Main Authors: Mastrandrea, Michael D., Mach, Katharine J., Plattner, Gian-Kasper, Edenhofer, Ottmar, Stocker, Thomas F., Field, Christopher B., Ebi, Kristie L., Matschoss, Patrick R.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-10-2011; Springer Nature B.V
• Subjects: Assessments; Atmospheric Sciences; Calibration; Climate change; Climate Change/Climate Change Impacts; Communication; Earth and Environmental Science; Earth Sciences; Environmental policy; Intergovernmental Panel on Climate Change; Language; Panels; Policy making; Uncertainty; Working groups; Climate Outcome; Uncertainty Guidance; Guidance Note; Third Assessment Report; Author Team
• ISSN: 0165-0009; 1573-1480
• DOI: 10.1007/s10584-011-0178-6

Evaluation and communication of the relative degree of certainty in assessment findings are key cross-cutting issues for the three Working Groups of the Intergovernmental Panel on Climate Change. A goal for the Fifth Assessment Report, which is currently under development, is the application of a common framework with associated calibrated uncertainty language that can be used to characterize findings of the assessment process. A guidance note for authors of the Fifth Assessment Report has been developed that describes this common approach and language, building upon the guidance employed in past Assessment Reports. Here, we introduce the main features of this guidance note, with a focus on how it has been designed for use by author teams. We also provide perspectives on considerations and challenges relevant to the application of this guidance in the contribution of each Working Group to the Fifth Assessment Report. Despite the wide spectrum of disciplines encompassed by the three Working Groups, we expect that the framework of the new uncertainties guidance will enable consistent communication of the degree of certainty in their policy-relevant assessment findings.