Interconnection between the Indian and the East Asian summer monsoon: Spatial synchronization patterns of extreme rainfall events. (23rd September 2022)

• Record Type: Journal Article
• Authors: Gupta, Shraddha; Su, Zhen; Boers, Niklas; Kurths, Jürgen; Marwan, Norbert; Pappenberger, Florian
• Is Part Of: International journal of climatology. Volume 43:Number 2(2023)
• Page Start: 1034
• Page End: 1049
• Publication Date: 2022-09-23
• Subjects: complex networks -- East Asian summer monsoon -- event synchronization -- extreme precipitation -- Indian summer monsoon -- Intraseasonal oscillation; Climatology -- Periodicals; Climat -- Périodiques; Climatologie -- Périodiques; 551.605
• DOI: 10.1002/joc.7861
• Languages: English
• ISSNs: 0899-8418

Abstract

Abstract: A deeper understanding of the intricate relationship between the two components of the Asian summer monsoon (ASM)—the Indian summer monsoon (ISM) and the East Asian summer monsoon (EASM)—is crucial to improve the subseasonal forecasting of extreme precipitation events. Using an innovative complex network‐based approach, we identify two dominant synchronization pathways between ISM and EASM—a southern mode between the Arabian Sea and southeastern China occurring in June, and a northern mode between the core ISM zone and northern China which peaks in July—and their associated large‐scale atmospheric circulation patterns. Furthermore, we discover that certain phases of the Madden–Julian oscillation and the lower frequency mode of the boreal summer intraseasonal oscillation (BSISO) seem to favour the overall synchronization of extreme rainfall events between ISM and EASM while the higher‐frequency mode of the BSISO is likely to support the shifting between the modes of ISM–EASM connection. Abstract : In this study, we use a combination of complex network and nonlinear synchronization measure, to identify two dominant extreme rainfall synchronization pathways between the Indian and the East Asian summer monsoon systems and the large‐scale atmospheric circulation patterns associated with each of them. We also investigate the influence of the intraseasonal oscillations, the Madden–Julian oscillations and the boreal summer intraseasonal oscillations on the intraseasonal variability of the relationship between the two monsoon systems.