The Arctic-Siberian Plain warming drives the heat waves in East Asia.

Generally, it is well known that the East Asian heatwaves are strongly affected by the Pacific-Japan pattern and circum-global teleconnection pattern. However, recent studies suggest that various teleconnection patterns also can contribute to the East Asian heat waves (e.g., Scandinavian pattern, Arctic Oscillation, El Nino-Southern Oscillation, etc.). However, the teleconnection between the Arctic-Siberian Plain (ASP) warming and East Asian heat waves has been unexplored. This study investigates the teleconnection mechanism between East Asian heatwaves and the warming over the ASP for the last 42 years (1979-2020). The results show that the enhanced surface radiative heating by the anticyclonic anomalies over the ASP region increases the air temperature and surface evaporation, amplifying the thermal high pressure via positive water vapor feedback. The Rossby wave, amplified by land-atmosphere interaction in the ASP, propagates to East Asia through the upper troposphere, causing favorable atmospheric patterns for the occurrence of the East Asian heatwaves.