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Abstract:
A deeper understanding of the intricate relationship be-
tween 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 south-eastern China occurring in June, and a north-
ern mode between the core ISM zone and northern China
which peaks in July – and their associated large-scale at-
mospheric circulation patterns. Furthermore, we discover
that certain phases of the Madden-Julian oscillation and
the lower frequency mode of the boreal summer intrasea-
sonal oscillation (BSISO) seem to favour the overall synchro-
nization 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 con-
nection.
