Input data set: Wood Harvesting

Description:

Annual wood-harvest area and harvested biomass carbon for five LUH3 land-use classes (primary forest, primary non-forest, secondary mature forest, secondary young forest and secondary non-forest) on the ISIMIP 0.25° and 0.5° grids, with an annual time step.

Area is given as a grid-cell fraction. Biomass carbon is given in kg per grid cell and split by end use into industrial roundwood and fuelwood, using roundwood/fuelwood fractions from LUH3, new in ISIMIP4. For each class, the roundwood and fuelwood variables sum exactly to that class's total harvested biomass carbon.

Per-country totals of the same fifteen quantities are published separately (see the national documentation entry for this dataset.)

Derived from the CMIP7 input4MIPs UofMD Land-Use Harmonization (LUH3) dataset, using the multiple-transitions wood-harvest area and biomass-carbon fields together with the multiple-management roundwood/fuelwood split fractions. Project page: https://luh.umd.edu/

Historical: UofMD-landState-3-1-2
SSP1-VL: UofMD-landState-vl-3-1-1
SSP3-H: UofMD-landState-h-3-1-1

All three were taken at input4MIPs publication version v20260408.

Chini, L. and Hurtt, G.: Land-Use Harmonization 3 v1.2 for CMIP7 Historical (LUH3 v1.2), source_id UofMD-landState-3-1-2, https://doi.org/10.5281/zenodo.19261724 — used for histsoc, 1850soc, 1901soc and 2021soc

Chini, L. and Hurtt, G.: Land-Use Harmonization 3 Future Scenario VL v1.1 for ScenarioMIP (LUH3-VL v1.1), source_id UofMD-landState-vl-3-1-1, https://doi.org/10.5281/zenodo.19353397 — used for ssp1vlsoc-noadapt

Chini, L. and Hurtt, G.: Land-Use Harmonization 3 Future Scenario H v1.1 for ScenarioMIP (LUH3-H v1.1), source_id UofMD-landState-h-3-1-1, https://doi.org/10.5281/zenodo.19354835 — used for ssp3hsoc-noadapt

References for the LUH methodology:
Hurtt et al. (2020), Geoscientific Model Development, https://doi.org/10.5194/gmd-13-5425-2020
Chini et al. (2021), Earth System Science Data, https://doi.org/10.5194/essd-13-4175-2021

Gridded and national values are computed independently, not one from the other. National totals are aggregated from the native 0.25° source field using the ISIMIP fractional country mask; gridded files are produced by conservatively remapping that same native field onto the 0.25°/0.5° target grids. A user's own country-mask aggregation of these gridded files will not exactly reproduce the national files' values.

The roundwood/fuelwood split is exhaustive by construction: for each of the five classes, the industrial-roundwood and fuelwood variables sum exactly to that class's total harvested biomass carbon. The unsplit total is not published, only the two parts, to avoid inviting a downstream double-count.

The biomass-carbon variables are per-grid-cell totals, not densities. They are remapped with a mass-conserving method rather than a plain conservative remap; mass is conserved between the native 0.25° field and both target resolutions to within about 0.3%, the same coastal-remap residual the area (harv) fractions carry.

2021soc differs between the two rounds. Under ISIMIP4b it holds the 2021 land-use state fixed across the 2022–2099 future window; under ISIMIP4a it holds the same state fixed across the full 1850–2025 historical period, as a present-day baseline.

Under ISIMIP4a, two years are held constant: the LUH3 multiple-transitions product this dataset reads stops at 2023, so 2024 and 2025 repeat that last observed year under histsoc, and 1901soc/2021soc hold their respective base year fixed across the whole 1850–2025 span.

Input data set: Wood Harvesting — Gridded (ISIMIP4)