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Abstract

Human land‐use and land‐use change are key drivers of change to the Earth’s carbon cycle and climate system. As a result, their accurate representation within Earth System Model (ESM) experiments is an increasingly important goal. The Land‐use Harmonization (LUH) connects historical land‐use reconstructions with future land‐use projections from Integrated Assessment Models (IAMs), attempts to preserve all future gridded changes depicted by the IAMs, computes associated land‐use transitions, and provides this data in a consistent format designed for use in ESMs. The 6th Coupled Model Inter‐comparison Project (CMIP6) recently made land‐use a required forcing, and the LUH2 dataset was made an entry card for participating in CMIP6 runs. LUH2 improves upon LUH1 in multiple ways, including finer spatial resolution (0.25 x 0.25 degrees), earlier model start date (850 AD), additional land‐use states and transitions including multiple cropland and pasture types, improved spatial detail for wood harvesting and shifting cultivation, and new data layers of land management information such as irrigation and fertilizer usage (Hurtt et al. in prep).

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