Global surface water quality datasets under uncertain climate and socio-economic change, derived from the dynamical surface water quality model (DynQual) at 5 arcmin spatial resolution

Global ~10km (5 arcmin) surface water quality data from the dynamical surface water quality model (DynQual) from 2005-2100, with annual and monthly temporal resolution. Simulations are made under three combined climate and socio-economic scenarios (SSP1-RCP2.6; SSP3-RCP7.0 and SSP5-RCP8.5) and using five general circulation model (GFDL-ESM4; UKESM1-0-LL; MPI-ESM1-2-hr; IPSL-CM6A-LR and MRI-ESM2-0), following the ISIMIP3b protocol (https://protocol.isimip.org/#/ISIMIP3b). Output data are provided at annual and monthly temporal resolution over WorldClim time periods (2005-2020; 2021-2040; 2041-2060; 2061-2080; 2081-2100).

Output data includes:
- Discharge (m3 s-1)
- Water temperature (K)
- Total dissolved solids (TDS) load (g s-1)
- Biological oxygen demand (BOD) load (g s-1)
- Fecal coliform (FC) load (million cfu s-1)
- Salinity; as indicated by TDS concentrations (mg l-1)
- Organic pollution; as indicated by BOD concentrations (mg l-1)
- Pathogen/bacterial pollution; as indicated by FC concentrations (cfu 100ml-1)

Note. A minimum discharge threshold of 0.1 m3 s-1 was used when computing TDS, BOD and FC concentrations, as uncertainties in absolute values of water availabilities have large impacts on resulting in-stream concentrations. Concentrations in these gridcells are assigned as NA.

Full time series of these variables at 30 arcmin (0.5 degree) can be found at: https://zenodo.org/records/14677534.