资源环境科技发展态势分析平台

This paper describes five sets of regions intended for use in summarizing extreme weather over Earth's land areas from a climate perspective. The sets differ in terms of their target size: similar to 10 Mm(2), similar to 5 Mm(2), similar to 2 Mm(2), similar to 0.5 Mm(2), and similar to 0.1 Mm(2) (where 1 Mm(2)= 1 million km(2)). The regions are based on political/economic divisions, and hence are intended to be primarily aligned with geographical domains of decision-making and disaster response rather than other factors such as climatological homogeneity. This paper describes the method for defining these sets of regions; provides the final definitions of the regions; and performs some comparisons across the five sets and other available regional definitions with global land coverage, according to climatological and non-climatological properties.