Research on extreme rainfall over eastern asia using complex networks

Abstract

We construct a climate network of extreme rainfall over eastern Asia during the period of 1971 to 2000. The study provides valuable insights into the spatial structure of 90th percentile rainfall events during the East Asia Summer Monsoon in June, July, and August (JJA). We calculate degree distribution which is one of the most important and simplest measures of networks from undirected network and directed network. The degree spatial pattern of undirected network is quite different among north, middle and south of eastern Asia, and research indicates the spatial scale of extreme rainfalls synchronization is lager over inland regions with non-typical monsoon climate than that of coastal regions with typical monsoon climate. The degree spatial pattern of directed network manifests the moisture sinks and the moisture sources. The result might be great helpful to understanding the dynamical mechanism of extreme rainfalls from a new aspect.