Joint effect of East Asia–Pacific and Scandinavian teleconnections on summer precipitation in Southwest China

Abstract Based on the summer precipitation data from 328 meteorological stations in Southwest China and monthly mean reanalysis National Centers for Environmental Prediction/National Center Atmospheric Research, relationships of with East Asia–Pacific (EAP) teleconnection pattern Scandinavian (SCA) are explored by using correlation analysis composite analysis. The results show that two teleconnections significantly negatively correlated same period. EAP SCA can affect affecting atmospheric circulation situation middle high latitudes, north–south east–west movement WPSH, water vapor transport southwest China. In particular, jointly China, which be divided into four categories configurations based their phases, is, (I) positive + SCA, (II) negative (III) (IV) SCA. distribution varies under different configurations. Category I corresponds to an opposite anomalies between north south configuration category I(II), cold air latitudes is weaker (stronger), WPSH more north(south) west(east) than climatological mean, mainly comes Western Pacific (Bay Bengal), thus resulting precipitation. While III(IV), no similar symmetrical found, obvious other characteristics as well.