Influence of Asian outflow on Rishiri Island, northernmost Japan: Application of radon as a tracer for characterizing fetch regions and evaluating a global 3D model

► Use radon and back trajectory to estimate fetch regions at Rishiri Island. ► Predominant continental fetch regions are southeastern Siberia and northeastern China. ► The major maritime fetch regions are the Sea of Okhotsk and the Bering Sea. ► A global 3D model accurately simulated radon and seasonal fetch regions.