Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation

C. He, Z. Liu, B. L. Otto-Bliesner, E.C. Brady, C. Zhu, R. Tomas, P.U. Clark, J. Zhu, A. Jahn, S. Gu, J. Zhang, J. Nusbaumer, D. Noone, H. Cheng, Y. Wang, M. Yan, Y. Bao

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Oxygen isotope speleothem records exhibit coherent variability over the pan-Asian summer monsoon (AM) region. The hydroclimatic representation of these oxygen isotope records for the AM, however, has remained poorly understood. Here, combining an isotope-enabled Earth system model in transient experiments with proxy records, we show that the widespread AM δ18Oc signal during the last deglaciation (20 to 11 thousand years ago) is accompanied by a continental-scale, coherent hydroclimate footprint, with spatially opposite signs in rainfall. This footprint is generated as a dynamically coherent response of the AM system primarily to meltwater forcing and secondarily to insolation forcing and is further reinforced by atmospheric teleconnection. Hence, widespread δ18Op depletion in the AM region is accompanied by a northward migration of the westerly jet and enhanced southwesterly monsoon wind, as well as increased rainfall from South Asia (India) to northern China but decreased rainfall in southeast China.
Original languageEnglish
Article numbereabe2611
Pages (from-to)1-12
Number of pages12
JournalScience Advances
Issue number4
Publication statusPublished (in print/issue) - 22 Jan 2021

Bibliographical note

Funding Information:
This work is supported by Chinese NSFC 41630527; U.S. NSF 1810682, 1810681, 1401803, and 1656907; Chinese NSFC 41888101; MOST2017YFA0603801; Nanjing Univ. Inf. Sci. & Tech. and Nanjing Normal University. The CESM project is supported primarily by the NSF. This material is based on work supported by the National Center for Atmospheric Research, which is a major facility sponsored by the NSF under Cooperative Agreement no. 1852977. Computing and data storage resources, including the Cheyenne supercomputer (doi: 10.5065/D6RX99HX), were provided by the Computational and Information Systems Laboratory (CISL) at NCAR. D.N. was supported by NSF award 1502806.

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