-
- PP11E-0870: Gone with the Tilt: Obliquity-Modulated Monsoon Pulses in East Asia From the Triassic to the Neogene
-
Board 0870‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Sophia Moxuan Zhang, Organization Not Listed (First Author, Presenting Author)
Vadim Kravchinsky, University of Alberta
Rui Zhang, College of Geography and Environmental Sciences, Zhejiang Normal University
Leonardo Sagnotti, Ist Naz Geofisica Vulcanologia
Yongbing Li, Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences
Likuan Zhang, Institute of Geology and Geophysics, Chinese Academy of Sciences
Joseph Ferraro, Baylor University
Earth’s monsoon systems bring seasonal rainfall to billions of people, and their long-term behavior is shaped by subtle changes in Earth’s orbit. While scientists have long studied how orbital cycles affect global climate, the role of axial tilt—or obliquity—in driving monsoon rainfall over millions of years is less well understood.In this study, we examine six sediment records from across East Asia, ranging from the Triassic to the Pliocene (240 to 2.6 million years ago). These records preserve strong signals of long-term obliquity rhythms—particularly 173,000-year and 1.2-million-year cycles—that align with past episodes of intensified monsoon rainfall and northward shifts in the tropical rainbelt. These patterns appear in times both with and without large ice sheets, suggesting that obliquity can drive tropical hydroclimate change independently of glacial cycles.
We also find that the influence of obliquity was sometimes enhanced by regional tectonics, such as the retreat of the Paratethys Sea or the uplift of the Tibetan Plateau. Our results show that axial tilt has been a persistent and powerful driver of East Asian rainfall for over 240 million years, helping to explain how the climate system responds to planetary motion.
Scientific DisciplineNeighborhoodType
Enter Note
Go to previous page in this tab
Session
