Long-term decrease in Asian monsoon rainfall and abrupt climate change events over the past 6,700 years

Yang, Bao, Qin, Chun, Bräuning, Achim, Osborn, Timothy, Trouet, Valerie, Ljungqvist, Fredrik Charpentier, Esper, Jan, Schneider, Lea, Grießinger, Jussi, Büntgen, Ulf, Rossi, Sergio, Dong, Guanghui, Yan, Mi, Ning, Liang, Wang, Jianglin, Wang, Xiaofeng, Wang, Suming, Luterbacher, Jürg, Cook, Edward R. and Stenseth, Nils Chr. (2021) Long-term decrease in Asian monsoon rainfall and abrupt climate change events over the past 6,700 years. Proceedings of the National Academy of Sciences, 118 (30). ISSN 0027-8424

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Abstract

Asian summer monsoon (ASM) variability and its long-term ecological and societal impacts extending back to Neolithic times are poorly understood due to a lack of high-resolution climate proxy data. Here, we present a precisely dated and well-calibrated tree-ring stable isotope chronology from the Tibetan Plateau with 1- to 5-y resolution that reflects high- to low-frequency ASM variability from 4680 BCE to 2011 CE. Superimposed on a persistent drying trend since the mid-Holocene, a rapid decrease in moisture availability between ∼2000 and ∼1500 BCE caused a dry hydroclimatic regime from ∼1675 to ∼1185 BCE, with mean precipitation estimated at 42 ± 4% and 5 ± 2% lower than during the mid-Holocene and the instrumental period, respectively. This second-millennium–BCE megadrought marks the mid-to late Holocene transition, during which regional forests declined and enhanced aeolian activity affected northern Chinese ecosystems. We argue that this abrupt aridification starting ∼2000 BCE contributed to the shift of Neolithic cultures in northern China and likely triggered human migration and societal transformation.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: LivePure Connector
Date Deposited: 17 Jun 2021 00:05
Last Modified: 13 Sep 2021 00:05
URI: https://ueaeprints.uea.ac.uk/id/eprint/80283
DOI: 10.1073/pnas.2102007118

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