Annual precipitation — SSP3-7.0 2071-2100 (CHELSA)
This layer maps projected total annual precipitation for the late-century period 2071–2100 under a high-emissions future.
Source: CHELSA-CMIP6 v2.1 (Karger et al.) Year: 2071-2100 Category: Physical risks · Mitigating services · Climate Chronic Risks · 2071-2100 Coverage: Global Format: Raster grid (~2 km) Used in risk analysis: No (contextual layer; not used in materiality scoring)
What it shows
This layer maps projected total annual precipitation for the late-century period 2071–2100 under a high-emissions future. It shows where rainfall is expected to increase or decrease relative to the historical baseline. As a forward-looking view of changing water availability, it helps anticipate where drying or wetting may stress ecosystems, water supply and agriculture.
How it is built
The source is the CHELSA high-resolution climatology (version 2.1), one of its standard bioclimatic measures, here in its future-projection form. It describes total annual precipitation averaged over 2071–2100 under the SSP3-7.0 high-emissions scenario, downscaled from a single climate model (MPI-ESM1-2-HR) at roughly a 2 km grid. As a projection from one model under one scenario, it should be read as an indicative future, not a precise forecast.
How to read it
Values are projected precipitation totals: higher values mark wetter projected conditions and lower values drier ones. The layer is most informative when compared against the 1981–2010 baseline precipitation layer to reveal the direction and scale of expected change at a site.
Class thresholds
The underlying quantity is a physical variable: projected total annual precipitation, in millimetres per year (mm/yr), averaged over 2071–2100 under the SSP3-7.0 high-emissions scenario. This is a continuous-gradient layer with no discrete risk classes — pixel values are the projected rainfall total itself, rendered on a smooth colour ramp spanning 0 to 3 000 mm/yr (the display range; the underlying data is not clipped to it). There is no risk-flag threshold: the layer is contextual and is not used in materiality scoring.
How these thresholds were set. There are no class breaks to set — the colour ramp is a Darwin in-house display choice (a linear stretch over the 0–3 000 mm/yr range, kept identical to the 1981–2010 baseline layer so the two can be compared directly), not a classification. The precipitation values themselves come unchanged from the CHELSA-CMIP6 v2.1 SSP3-7.0 projection (MPI-ESM1-2-HR).
Source
CHELSA-CMIP6 version 2.1 (Karger et al.), open licence.
Comparison with the WWF Risk Filter Suite
There is no equivalent indicator in the WWF Risk Filter Suite. This is a forward-looking climate-scenario variant; the WWF Suite publishes present-day indicators rather than late-century bioclimatic projections, so it has no distinct WWF counterpart and is a Darwin extension of the chronic-climate theme.
Legend
Symbolised field: Annual precipitation
Generated from darwin/layers/layer-chelsa-precip_annual-ssp370.toml and risk_indicator_pairs.toml (develop).