Producing actionable climate change information for regions: the distillation paradigm and the 3R framework

The issue of the distillation of actionable climate change information for application to vulnerability, impacts and adaptation studies in support of climate service activities (or VIA-CS) at regional to local scales is revisited. The 3R approach is introduced: robustness, reliability and relevance. Climate information for regions needs to be robust in the sense of producing statistically significant and consistent change signals based on multimodel and multimethod ensembles; it needs to be reliable in the sense of being based on a good understanding of the physical processes underlying the change signals, and on models capable of reproducing the functioning of the climate system at different scales; it needs to be relevant in the sense of providing information targeted for use in VIA-CS applications, including a proper characterization of uncertainties based on probabilistic approaches. It is advocated that the distillation problem requires an interdisciplinary consensus approach and a new generation of scientists acting at the interface between the climate modelling and end-user communities.