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Constraining climate model projections with observations amplifies future runoff declines
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Constraining climate model projections with observations amplifies future runoff declines
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Journal Article
Constraining climate model projections with observations amplifies future runoff declines
2026
Overview
Climate models are increasingly used to inform water availability projections at regional scales. However, the models’ own runoff sensitivities—the change in runoff per unit change of precipitation or temperature—are often biased, which can degrade their projections of runoff change. Specifically, models tend to underestimate the runoff decline in response to a temperature increase. Here, we conduct a comprehensive analysis with multiple observational datasets, two climate model generations, and large ensemble sampling of internal climate variability to assess these biases and to constrain future runoff projections across major river basins globally. For basins that can be robustly constrained by available observations, the constraint indicates stronger runoff declines than raw model projections. The constrained projections thus indicate more severe impacts of climate change on water resources than indicated by direct climate model output.
Global river runoff projections constrained by observations indicate stronger declines in runoff under climate change than raw model outputs, according to a study combining multiple observational datasets, two generations of climate models, and large ensemble sampling of internal variability.
