On the glacial-interglacial variability of the Asian monsoon in speleothem delta O-18 records

TitleOn the glacial-interglacial variability of the Asian monsoon in speleothem delta O-18 records
Publication TypeJournal Article
Year of Publication2020
AuthorsLiu G, Li X, Chiang H-W, Cheng H, Yuan S, Chawchai S, He S, Lu Y, Aung LThu, Maung PMaung, Tun WN, Oo KMoe, Wang X
JournalScience Advances
Volume6
Issue7
Date Published02/2020
Abstract

While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (delta O-18) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem delta O-18 records from three locations along the trajectory of the Indian summer monsoon (ISM), a major branch of the AM, and characterize AM rainfall over the past 180,000 years. We have found that the records close to the monsoon moisture source show large glacial-interglacial variability, which then decreases landward. These changes likely reflect a stronger oxygen isotope fractionation associated with progressive rainout of AM moisture during glacial periods, possibly due to a larger temperature gradient and suppressed plant transpiration. We term this effect, which counteracts the forcing of glacial boundary conditions, the moisture transport pathway effect.

DOI10.1126/sciadv.aay8189