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We present the development and validation of a simplified permafrost-carbonmechanism for use with the land surface scheme operating in the CLIMBER-2earth system model. The simplified model estimates the permafrost fractionof each grid cell according to the balance between modelled cold (below0 °C) and warm (above 0 °C) days in a year. Areasdiagnosed as permafrost are assigned a reduction in soil decomposition rate,thus creating a slow accumulating soil carbon pool. In warming climates,permafrost extent reduces and soil decomposition rates increase, resultingin soil carbon release to the atmosphere. Four accumulation/decompositionrate settings are retained for experiments within the CLIMBER-2(P) model,which are tuned to agree with estimates of total land carbon stocks todayand at the last glacial maximum. The distribution of this permafrost-carbonpool is in broad agreement with measurement data for soil carbon content.The level of complexity of the permafrost-carbon model is comparable toother components in the CLIMBER-2 earth system model

A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model