Global Rossby wave rivers connecting remote wave activity to the East Asian summer monsoon

We introduce a sink-oriented Rossby wave river (WR) framework that traces remote wave activity along continuous propagation pathways converging toward specific sinks, and use the Li-Yang wave ray flux to diagnose the global WRs converging into the East Asian summer monsoon (EASM) region. At 850 hPa, Southern Hemisphere and pan-tropical pathways dominate and converge near the Philippines; at 500 hPa, low-latitude easterly and midlatitude westerly WRs become comparable in strength; at 200 hPa, WR propagation becomes concentrated along the jet waveguide. Strikingly, the two major 500-hPa WRs undergo nearly head-on confluence, forming a climatological Rossby wave front that closely coincides with the Meiyu front. Vertically, the dominant pathway shifts from the southern monsoon channel below to the northwestern westerly waveguide aloft, with the transition occurring above the Meiyu–Changma–Baiu rainband. This sink-oriented perspective reframes EASM teleconnections as an interconnected global wave-propagation network linking remote Rossby wave sources to regional climate impacts.