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The Radiative Forcing Model Intercomparison Project (RFMIP) is one of the 21 World Climate Research Programme (WCRP) endorsed model intercomparisons for the forthcoming Coupled Model Intercomparison Phase 6 (CMIP6) exercise.

The goal of RFMIP is to answer one of the three key questions of CMIP6, namely, how does the earth system respond to [radiative] forcing? The effective radiative forcing and rapid adjustments from climate models participating in CMIP6 will be analysed. We will then aim to evaluate the uncertainty in greenhouse gas and aerosol radiative forcing from an additional set of experiments with prescribed greenhouse gas, aerosol and background climatologies, using each model’s native radiative transfer model.

There are three main components of RFMIP:


Diagnosing components of effective radiative forcing in CMIP6 models


Testing of radiation code parameterisations


Model responses to aerosol forcing, 1850-present