On the glacial-interglacial variability of the Asian monsoon in speleothem δ 18 O records | Zendy

Guangxin Liu | Zendy; Xianglei Li | Zendy; HongWei Chiang | Zendy; Hai Cheng | Zendy; Shufang Yuan | Zendy; Sakonvan Chawchai | Zendy; Shaoneng He | Zendy; Yi Lü | Zendy; Lin Thu Aung | Zendy; Phyo Maung Maung | Zendy; W. N. Tun | Zendy; Kyaw Moe Oo | Zendy; Xianfeng Wang | Zendy

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

Author(s) -

Guangxin Liu,

Xianglei Li,

HongWei Chiang,

Hai Cheng,

Shufang Yuan,

Sakonvan Chawchai,

Shaoneng He,

Yi Lü,

Lin Thu Aung,

Phyo Maung Maung,

W. N. Tun,

Kyaw Moe Oo,

Xianfeng Wang

Publication year - 2020

Publication title -

science advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.928

H-Index - 146

ISSN - 2375-2548

DOI - 10.1126/sciadv.aay8189

Subject(s) - speleothem , glacial period , interglacial , monsoon , geology , east asian monsoon , climatology , physical geography , geography , paleontology , cave , archaeology

While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (δO) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem δO 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.

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