On the glacial-interglacial variability of the Asian monsoon in speleothem δ18O records

被引：74

作者：

Liu, G. ^{[1
,2
,3
]}

Li, X. ^{[4
]}

Chiang, H-W ^{[2
]}

Cheng, H. ^{[4
]}

Yuan, S. ^{[1
,2
,3
]}

Chawchai, S. ^{[5
]}

He, S. ^{[2
]}

Lu, Y. ^{[2
]}

Aung, L. T. ^{[2
,6
]}

Maung, P. M. ^{[2
,7
]}

Tun, W. N. ^{[6
]}

Oo, K. M. ^{[7
]}

Wang, X. ^{[2
,3
]}

机构：

[1] Nanyang Technol Univ, Interdisciplinary Grad Sch, Singapore 639798, Singapore

[2] Nanyang Technol Univ, Earth Observ Singapore, Singapore 639798, Singapore

[3] Nanyang Technol Univ, Asian Sch Environm, Singapore 639798, Singapore

[4] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China

[5] Chulalongkorn Univ, Dept Geol, Bangkok 10330, Thailand

[6] Myanmar Earthquake Comm, Yangon 11052, Myanmar

[7] Dept Meteorol & Hydrol, Nay Pyi Taw 15011, Myanmar

来源：

SCIENCE ADVANCES | 2020年 / 6卷 / 07期

基金：

新加坡国家研究基金会;

关键词：

WATER-VAPOR; RELATIVE-HUMIDITY; DEUTERIUM EXCESS; HIGH-RESOLUTION; SUMMER MONSOON; ICE CORE; ISOTOPIC COMPOSITION; HYDROGEN ISOTOPES; SOLAR-RADIATION; INDIAN MONSOON;

D O I：

10.1126/sciadv.aay8189

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

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