[A-AS08] Multiple scale structure and their interactions in Asian monsoon system

[AAS08-04] Influence of climate change on the interactions between the South Asian monsoon and West-North Pacific typhoons

★Invited Papers

*Krishnan Raghavan¹, Aswin Sagar^1,2, T. P. Sabin¹ (1.Indian Institute of Tropical Meteorology, Pune, India, 2.Savitribai Phule Pune University)

Keywords:South Asian Monsoon, West-North Pacific Typhoons, Climate Change

Interactions of convective activities associated with the South Asian monsoon and the West-North Pacific (WNP) typhoons have attracted meteorologists for a long time. Several past studies have documented an out-of-phase variation in the observed convective activities between the two regions on sub-seasonal time-scales. In this connection, it is often observed that periods characterized by typhoons crossing over to the north of 30^oN over the WNP typically coincide with ‘breaks’ in the monsoon rainfall over the Indian subcontinent.
Human-induced climate change has been a key driver of the observed changes in global land monsoon precipitation, since the second half of the 20^th century (IPCC AR6 WG1, 2021). In particular, it is recognized that the expected enhancement of the South Asian monsoon precipitation by greenhouse gas (GHG) forcing has been offset by precipitation reductions since 1950s caused by the Northern Hemisphere (NH) anthropogenic aerosols (IPCC AR6 WG1, 2021). Given this backdrop of changes in the observed monsoon precipitation since the mid-20^th century, a relevant scientific issue arises as to whether human-induced climate change has influenced the interactions of convective activities between the South Asian monsoon region and the WNP typhoons. The present talk is aimed at addressing this scientific problem using results from high-resolution climate change experiments together with insights from observed datasets.