FaIR v1.6.2: Calibrated Parameter Ensemble for IPCC AR6

2237 ensemble members provide calibrated parameters for the FaIR simple climate model used in the IPCC Sixth Assessment Report. The dataset, drawn from a prior of 1 million members, is constrained by historical observations of warming, ocean heat content, and atmospheric CO2 concentrations. It includes full and reduced-size parameter sets optimized for climate assessment scenarios.

Use Cases

• Running climate projections for IPCC Working Group 3 assessments based on the constrained parameter ensemble.
• Analyzing the distribution of equilibrium climate sensitivity across the calibrated ensemble members.
• Investigating transient climate response parameters derived from historical observational constraints.
• Testing model behavior under Shared Socioeconomic Pathway (SSP) scenarios using the provided parameter sets.

Strengths

• Contains 2237 ensemble members rigorously constrained by multiple historical observations, including warming from 1850-2019.
• Derived from a substantial initial prior ensemble of 1 million members, indicating a thorough sampling and filtering process.
• Includes multiple file versions (full, slim, common) optimized for different computational and analysis needs.

Limitations

• Specific column names and data structure within the JSON files are not described in the provided metadata.
• The exact dataset size (file size) and row count are not specified across any source.
• Conflicting metadata exists: some sources list an organization (University of Leeds) while others do not.

Provenance

Source

Chris Smith, associated with the University of Leeds.

Collection Method

Parameters were drawn from a prior ensemble of 1 million members and constrained by historical observational data to match IPCC AR6 assessed ranges.

Time Range

Calibration and constraints reference historical periods from 1850 to 2019.