H2CM - model simulations

Dataset overviewThis archive contains the monthly, global output of our Hybrid Hydrological Carbon‐Cycle Model (H2CM) from a 10-fold cross‐validation experiment (with priors placed on the global constants). Each of the ten NetCDF files corresponds to one held-out fold and provides model predictions on a regular 1°×1° latitude–longitude grid for the period 1 January 2001 through 31 December 2019. Spatial and temporal resolution Spatial grid: 180 latitudes (from 89.5° N to 89.5° S) by 360 longitudes (from 179.5° W to 179.5° E) Temporal resolution: monthly time steps (228 months total) Variables and units Variable Description Units gpp Gross primary productivity g C m⁻² day⁻¹ npp Net primary productivity g C m⁻² day⁻¹ nee Net ecosystem exchange (GPP minus TER) g C m⁻² day⁻¹ Ra Autotrophic respiration g C m⁻² day⁻¹ Rh Heterotrophic respiration g C m⁻² day⁻¹ ter Terrestrial ecosystem respiration (Ra + Rh) g C m⁻² day⁻¹ T Transpiration mm day⁻¹ Purpose and usage These files support evaluation of H2CM’s ability to predict carbon fluxes (and transpiration) under a cross‐validation framework. By providing ten independent model realizations—each omitting one fold of training data—users can: Assess spatial and temporal uncertainties in carbon flux estimates Reproduce key results on model performance in tropical, arid, and temperate regions Integrate these outputs into further analyses of ecosystem responses to climate variability Users may load any single fold for standalone analysis or combine multiple folds to derive ensemble means, confidence intervals, and sensitivity metrics. Additional informationIt's important to note that the original model simulations were conducted with a daily temporal resolution, but the data shared here have been aggregated to a monthly scale. We are open to sharing the original daily simulations and additional variables not included in this repository upon request. Please feel free to reach out to us for more information or data requests.