New insights towards an integrated understanding of NE Asian monsoon during mid to late Holocene
New insights towards an integrated understanding of NE Asian monsoon during mid to late Holocene
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DOI：
10.1016/j.quascirev.2020.106793
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发表时间：
2021-02
影响因子：
4
通讯作者：
Jingyao Zhao;L. Tan;Yan Yang;C. Pérez-Mejías;Y. A. Brahim;Jianghu Lan;Jian Wang;Hanying Li
中科院分区：
文献类型：
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作者：
Jingyao Zhao;L. Tan;Yan Yang;C. Pérez-Mejías;Y. A. Brahim;Jianghu Lan;Jian Wang;Hanying Li
Speleothem records from NE Asia are essential to understand the spatial patterns of the Asian Summer Monsoon (ASM) variability. In this paper, we present a new high-resolution and chronologically well-resolved speleothem record from Liu-li (LL) cave, NE China, through δ18O, δ13C and Sr/Ca ratio characterizing a dynamic ASM history over the past 6680 years. The LL δ18O record shows a long-term trend to higher values, following the North Hemisphere summer insolation (NHSI), with the exception of the last 2 kyr characterized by a negative δ18O excursion. The ‘2-kyr shift’ is evident in NE Asia over the past 2 kyr, originally inferred from the speleothem δ18O negative excursion in South China, as well as in many other proxy records from East China, but it merely manifests a flat trend in most of the western East Asian Summer Monsoon (EASM) and Indian Summer Monsoon (ISM) regions, rather than a negative excursion. On multi-centennial to millennial timescales, the intensification of the Tsushima Warm Current (TWC) can amplify rainfall on both sides of the Japan Sea. A close comparison between the monsoon reconstruction and the cultural changes in NE Asia suggests contemporary climatic and cultural regime-shifts, implying an important role of the ASM weakening in the collapse of Neolithic and Early Bronze cultures in this region.
