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

G. Liu; X. Li; H. W. Chiang; H. Cheng; S. Yuan; S. Chawchai; S. He; Y. Lu; L. T. Aung; P. M. Maung; W. N. Tun; K. M. Oo; X. Wang

doi:10.1126/sciadv.aay8189

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

G. Liu^*, X. Li, H. W. Chiang, H. Cheng, S. Yuan, S. Chawchai, S. He, Y. Lu, L. T. Aung, P. M. Maung, W. N. Tun, K. M. Oo, X. Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

75 Citations (Scopus)

Abstract

While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (δ¹⁸O) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem δ¹⁸O 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.

Original language	English
Article number	eaay8189
Journal	Science advances
Volume	6
Issue number	7
DOIs	https://doi.org/10.1126/sciadv.aay8189
Publication status	Published - 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

ASJC Scopus Subject Areas

General

Access to Document

10.1126/sciadv.aay8189

Cite this

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title = "On the glacial-interglacial variability of the Asian monsoon in speleothem δ18O records",

abstract = "While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (δ18O) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem δ18O 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.",

author = "G. Liu and X. Li and Chiang, {H. W.} and H. Cheng and S. Yuan and S. Chawchai and S. He and Y. Lu and Aung, {L. T.} and Maung, {P. M.} and Tun, {W. N.} and Oo, {K. M.} and X. Wang",

note = "Publisher Copyright: Copyright {\textcopyright} 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).",

year = "2020",

doi = "10.1126/sciadv.aay8189",

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AU - Liu, G.

AU - Li, X.

AU - Chiang, H. W.

AU - Cheng, H.

AU - Yuan, S.

AU - Chawchai, S.

AU - He, S.

AU - Lu, Y.

AU - Aung, L. T.

AU - Maung, P. M.

AU - Tun, W. N.

AU - Oo, K. M.

AU - Wang, X.

N1 - Publisher Copyright: Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

PY - 2020

Y1 - 2020

N2 - While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (δ18O) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem δ18O 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.

AB - While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (δ18O) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem δ18O 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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