Title: Impact of global warming on the Asian summer monsoon

Authors: Chenxi Xu¹, Wenling An¹, Junbo Ren¹, Qingyu Zhao¹, Ru Huang¹, Yaru Zhao¹, Yucheng Liu¹, Zhengtang Guo¹

Affiliations:
¹ Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Abstract: The impact of global warming on the Asian summer monsoon has garnered significant attention due to its implications for regional hydroclimate. However, high-resolution monsoon records in the low-latitude monsoon region of Asia remain scarce. Tree ring oxygen isotope can not only solve the problem of cross-dating for trees in low latitudes, but also is a promising proxy summer hydroclimate. 
In this study, we utilized tree ring oxygen isotopes to reconstruct the history of the Asian summer monsoon over the past few hundred years. Our findings reveal two key insights: Firstly, the South Asian summer monsoon has weakened in response to global warming, leading to a notable increase in the frequency of extreme drought events. Secondly, global warming has strengthened the relationship between the Asian summer monsoon and the El Niño-Southern Oscillation.
These results underscore the potential for more frequent and severe extreme events in monsoonal Asia in the future. To evaluate impacts of higher temperature in future on the Asian summer monsoon, future research should focus on investigating seasonal to interdecadal monsoon changes using high-resolution records from deep time such as the Miocene and Pliocene.

Biography: Chenxi Xu is the Deputy director of Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, where he also holds a Professorship. Dr. Xu received his PhD from Nagoya University Japan. After 2 years as a postdoc at the Research Institute for Humanity and Nature, Japan, he moved to the Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.
His research focused on high-resolution Asian summer monsoon variations in the past using tree ring oxygen isotopes. He will introduce Asian summer monsoon variations in the past several hundred years and deep time.