CMIP6-LOCA2 spatial summaries of HU8 and HU10 watershed boundaries from 1950-2100 for the Contiguous United States

Three different CMIP6-LOCA2 based climate projection data sets are spatially averaged over the Watershed Boundary Dataset (WBD) using HU8 and HU10 hydrologic units for the contiguous United States to provide time series for analysis. The primary data set is the statistically downscaled CMIP6-LOCA2 (Localized Constructed Analogs, v20220519 version, Pierce et al. 2023), which includes temperature and precipitation projections from the Climate Model Intercomparison Program Phase 6 (CMIP6) for 27 models under the ssp245, ssp370, and ssp585 scenarios. The “unsplit Livneh” (Pierce et al., 2021) is used as the training data set for LOCA2, where hydrologic unit spatial summaries are also included here for convenience. The second data set analyzes the daily LOCA2 to produce 36 annual and 4 monthly threshold and extreme event metrics (CMIP6-LOCA2 Thresholds). Many of the threshold exceedance variables stem from the Climdex project (https://www.climdex.org), which predominately uses metric units. Additional English-based thresholds were included to support Department of the Interior research. The third data set is from a monthly water-balance model that used the LOCA2 projections to simulate the hydrological cycle of runoff, snow, soil moisture, and evapotranspiration (CMIP6-LOCA2 MWBM). Users interested in 6 km grids should refer to the home pages of each of the respective sources. Each of these three data sets are spatially average using the Watershed Boundary Dataset (WBD) using HU8 and HU10 hydrologic units (https://www.usgs.gov/national-hydrography/watershed-boundary-dataset). The NetCDF time series files herein can be linked to the shapefile geometry using the “huc8” and “huc10” fields in the respective files. The “feature_area” variable can be used to create weighted averages for multiple HUs, such creating a weighted HU2 average from the HU8 units. The 27 included CMIP6 GCMs are: ACCESS-CM2, ACCESS-ESM1-5, AWI-CM-1-1-MR, BCC-CSM2-MR, CESM2-LENS, CNRM-CM6-1, CNRM-CM6-1-HR, CNRM-ESM2-1, CanESM5, EC-Earth3, EC-Earth3-Veg, FGOALS-g3, GFDL-CM4, GFDL-ESM4, HadGEM3-GC31-LL, HadGEM3-GC31-MM, INM-CM4-8, INM-CM5-0, IPSL-CM6A-LR, KACE-1-0-G, MIROC6, MPI-ESM1-2-HR, MPI-ESM1-2-LR, MRI-ESM2-0, NorESM2-LM, NorESM2-MM, TaiESM1

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