Role of the Siberian Summer Cold Wave in Intensifying East Asian Summer Precipitation

In this study, we clarify the role of a distinguished weather pattern over Siberia that has contributed to intense summer precipitation across East Asia, particularly in recent decades. This weather pattern, termed the Siberian Summer Cold Wave (SSCW), is defined through rigorous criteria and retrospective case selection. SSCW is characterized by the rapid influx of cold air from the Siberian region into East Asia during summer, which is associated with an increase in the potential temperature gradient, leading to the development of precipitation. Since the early 2000s, the frequency of SSCW events has increased, coinciding with a rise in severe precipitation events, underscoring its significance. Although SSCW has played a crucial role in influencing precipitation in East Asia, previous studies have predominantly focused on mechanisms related to heavy rainfall occurring in southern regions of East Asia. Consequently, there has been a relative lack of research investigating systems contributing to heavy precipitation from the north. This study provides a comprehensive analysis of SSCW events and elucidates their precipitation characteristics, positioning SSCW as a pivotal precipitation pattern within the East Asian summer climate. Our findings highlight the need for continued research to better understand SSCW dynamics and effectively mitigate associated risks.