1_Alaska NHM by-HRU mean-monthly calibration targets derived from Global Circulation Model (GCM) simulations, 1980 – 2022

This data release contains inputs for and outputs from hydrologic simulations for the Alaska (AK) domain using the Precipitation Runoff Modeling System (PRMS) version 5.2.1.1 and the USGS National Hydrologic Model infrastructure (NHM, Regan and others, 2018). This child item holds NetCDF files and methodology to make mean-monthly calibration targets (baselines) for the AK domain, as was used in the “byHRU” calibration. Global Circulation Model (GCM) data from National Aeronautics and Space Administration (NASA) were processed into 10 mean-monthly global datasets (Koczot and others, 2025) and stored in NetCDF format (.nc file extension; https://www.unidata.ucar.edu/software/netcdf/). Using these datasets, mean-monthly values were computed for each hydrologic response unit (HRU) in the AK domain (Bock and others, 2024). Resulting data are used as calibration targets for the AK NHM-PRMS model application. DATA TYPE DESIGNATION: Data layers are labeled according to type, as shown below: ID Data Type 1. AET Actual evapotranspiration 2. GW Groundwater (really baseflow) component of total runoff. 3. PET Potential evapotranspiration 4. SCA Snow-cover area (fraction of cell area) from NASA FLDAS. 5. SM Soil moisture 6. SR Solar radiation 7. SRO Surface runoff 8. SSR Subsurface runoff. 9. SWE Snow-water equivalent 10. SWI Soil-water infiltration CONTENTS OF THIS CHILD PAGE: 1. 10 NetCDF Files (1 for each data type). 1. AK_AET_filled.nc 2. AK_GW_filled.nc 3. AK_PET_filled.nc 4. AK_SCA_filled.nc 5. AK_SM_filled.nc 6. AK_SRO_filled.nc 7. AK_SR_filled.nc 8. AK_SSR_filled.nc 9. AK_SWE_filled.nc 10. AK_SWI_filled.nc 2. metadata XML file

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