data api · Global

Climate Change Impact on Water Resources (CCIWR)

Projected future changes in water resources across all global land areas at 0.5° × 0.5° resolution, built on top of the ISIMIP3b protocol. It covers three hydrological variables — total runoff, diffuse groundwater recharge, and actual evapotranspiration — derived from a multi-model ensemble of global hydrological and CMIP6 climate models. Relative changes are provided for three future 30-year horizons under three emissions scenarios (SSP1-2.6, SSP3-7.0, SSP5-8.5), at annual and seasonal timescal

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What's in it

Data offered docs-verified: total runoff · diffuse groundwater recharge · actual evapotranspiration · relative change vs 1985–2014 baseline · absolute future value (mm)
Coverage docs-verified: Global land areas · Historical baseline 1985–2014; three future 30-year horizons centred on 2030, 2055 and 2085
Resolution docs-verified: 0.5° × 0.5° spatial grid; annual and seasonal (yearly, DJF, MAM, JJA, SON) outputs
Formats docs-verified: Zarr v3 (sharded)
Access docs-verified: Public; anonymous S3 access with no API key. Licence not stated in docs; see product README.

Useful for

Use cases llm-inferred: Screening future groundwater recharge and runoff change at a site for climate-resilience or water-resource assessments · Ensemble-median and percentile range of runoff change for catchment-scale climate sensitivity narratives · Mapping model consensus on drying thresholds to add risk-aware climate context to adaptation or drainage strategies
Audience llm-inferred: hydrologists · water resources engineers · climate change adaptation planners · environmental consultants · GIS analysts

Limitations

Constraints llm-inferred: Coarse 0.5° grid; site-scale (sub-km) assessments would need downscaling · Number of available ensemble members varies by pixel, so statistics use valid members only · Outputs are model projections reflecting ensemble uncertainty, not observations or a single trajectory · Relative change is against a 1985–2014 baseline; absolute values are only in the FUTUR group · Requires a Zarr v3 (zarr>=3) reader; older tooling will not open the sharded store · Underlying paper is under review (EGUsphere preprint) · Product created June 2026; limited track record and maintenance cadence unknown · Licence not stated in docs; check the product README before client deliverables

Licence: see product README
Authentication: Public; anonymous HTTPS/S3 access via data.source.coop
GitHub stars: Unknown
Last commit: Unknown
Last successful page check: 14/10/2026
Page health: page reachable
Package: Not recorded
Verification: Not independently verified

Provenance & evidence

Verified via Source Cooperative API /api/v1/products/earthblox (public product, updated 2026-06-16).

Metadata observed 14/10/2026 · research sweep: manual-2026-10-15 (source.coop)