Take some representative set of
climate models predicting the
climate at the end of the 21st century given some scenario of emissions (for example the 20 models in the
archive established by IPCC for the 4th assessment) and compute this global measure of
local impact.
Adding
local information, not captured in the coarse scale
climate model or observational
archives, can provide an improved representation of the relevant processes at this scale, and thus yield additional information, for instance concerning topography, land use or small scale features such as sea breezes or organisation of convection.