Variabilities of the spring river runoff system in East China and their relations to precipitation and sea surface temperature

摘要: The annual cycle and variabilities of the spring river runoff in East China (EC) at continental scale their relationship with precipitation, sea surface temperature (SST), El Nino-Southern Oscillation(ENSO) are investigated. Monthly mean data from 72 stations 160 precipitation EC, covering a period between 1951 1983, used for this study. seasonal evolution depth is generally consistent that rainfall but has more regional characteristics. dominant spatial patterns temporal variations studied empirical orthogonal function (EOF) analysis. leading EOFs show intensity South highly correlated each other, indicating direct response to which different summer situation. Statistic analysis suggests ENSO event may exert strong influence on these two modes. second present north-south oscillation EC Nanling Mountain as boundary also well correlated. These modes related distribution topography not be influenced by ENSO. third exhibit east–west oscillations both precipitation. interdecadal precipitation/runoff SST further singular value decomposition (SVD) results indicate first coupled mode associated anomalies an ENSO-like signal indicates pronounced warming (SST) wetting (runoff) trends North after mid-1970s, observed runoff. links subtropical main EOF China. Copyright © 2008 Royal Meteorological Society