Remote influence of the interannual variability of the Australian summer monsoon on wintertime climate in East Asia and the western North Pacific

Abstract Anomalous convective activity in the Tropics forced by sea surface temperature (SST) variability exerts significant remote influence that provides a basis for seasonal prediction extratropics. In austral summer exhibits pronounced interannual over northern Australia (NAUS), which is, however, unlikely SST anomalies but essentially manifestation of internal Australian monsoon (AUSM) system. Based on observational data, present study reveals its impacts wintertime climate East Asia and western North Pacific. The anomalous AUSM excites Western Pacific (WP) pattern, as confirmed through an atmospheric general circulation model experiment. Through this cross-equatorial teleconnection, enhanced leads to strengthening Asian winter with colder Korean Peninsula Japan reduced precipitation southern China. Okhotsk sea-ice extent decreases under warm weakened offshore winds. same opposite polarities. Our data analysis numerical experiments reveal WP-like are excited propagation stationary Rossby waves generated upper-level divergent wind from NAUS extends into Northern Hemisphere subtropical jet. climatological Hadley is essential process. concomitant diabatic heating feedback forcing transient eddies along stormtrack act further amplify response.