Loess deposits in the low latitudes of East Asia reveal the ~20-kyr precipitation cycle

Xusheng Li, Yuwen Zhou, Zhiyong Han (), Xiaokang Yuan, Shuangwen Yi, Yuqiang Zeng, Lisha Qin, Ming Lu and Huayu Lu
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Xusheng Li: Nanjing University
Yuwen Zhou: Nanjing University
Zhiyong Han: Nanjing University
Xiaokang Yuan: Nanjing University
Shuangwen Yi: Nanjing University
Yuqiang Zeng: Nanjing University
Lisha Qin: Nanjing University
Ming Lu: Nanjing University
Huayu Lu: Nanjing University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The cycle of precipitation change is key to understanding the driving mechanism of the East Asian summer monsoon (EASM). However, the dominant cycles of EASM precipitation revealed by different proxy indicators are inconsistent, leading to the “Chinese 100 kyr problem”. In this study, we examine a high-resolution, approximately 350,000-year record from a low-latitude loess profile in China. Our analyses show that variations in the ratio of dithionite−citrate−bicarbonate extractable iron to total iron are dominated by the ~20-kyr cycle, reflecting changes in precipitation. In contrast, magnetic susceptibility varies with the ~100-kyr cycle and may be mainly controlled by temperature-induced redox processes or precipitation-induced signal smoothing. Our results suggest that changes in the EASM, as indicated by precipitation in this region, are mainly forced by precession-dominated insolation variations, and that precipitation and temperature may have varied with different cycles over the past ~350,000 years.

Date: 2024
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DOI: 10.1038/s41467-024-45379-9

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