Preprints
https://doi.org/10.5194/cp-2023-87
https://doi.org/10.5194/cp-2023-87
21 Nov 2023
 | 21 Nov 2023
Status: a revised version of this preprint was accepted for the journal CP and is expected to appear here in due course.

A series of climate oscillations around 8.2 ka BP revealed through multi-proxy speleothem records from North China

Pengzhen Duan, Hanying Li, Zhibang Ma, Jingyao Zhao, Xiyu Dong, Ashish Sinha, Peng Hu, Haiwei Zhang, Youfeng Ning, Guangyou Zhu, and Hai Cheng

Abstract. The 8.2 ka event has been extensively investigated as a remarkable single event, but rarely considered as a part of multi-centennial climatic evolution. Here, we present absolutely dated speleothem multi-proxy records spanning 9.0–7.9 ka BP from Beijing in North China, near the northern limit of the East Asian summer monsoon (EASM) and thus sensitive to climate change, to provide evidence for the intensified multi-decadal climatic oscillations since 8.5 ka BP. Three extreme excursions characterized by inter-decadal consecutive δ18O excursions exceeding ±1σ are identified from 8.5 ka BP in our speleothem record. The former two are characterized by enriched 18O at ~8.40 and 8.20 ka BP, respectively, suggesting a prolonged arid event which is supported by the positive trend in δ13C values, increased trace element ratios, and lower growth rate. Following the 8.2 ka event, an excessive rebound immediately emerges in our δ18O and trace element records but moderate in the δ13C, probably suggesting pluvial conditions and nonlinear response of the local ecosystem. Following two similar severe droughts at 8.40 and 8.20 ka BP, the different behavior of δ13C suggests the recovering degree of resilient ecosystem responding to different rebounded rainfall intensity. A comparison with other high-resolution records suggests that the two droughts-one pluvial patterns between 8.5 and 8.0 ka BP are of global significance instead of a regional phenomenon, which is causally linked to the slowdown and acceleration of the Atlantic Meridional Overturning Circulation that was further dominated by the freshwater injections in the North Atlantic.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Pengzhen Duan, Hanying Li, Zhibang Ma, Jingyao Zhao, Xiyu Dong, Ashish Sinha, Peng Hu, Haiwei Zhang, Youfeng Ning, Guangyou Zhu, and Hai Cheng

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on cp-2023-87', Anonymous Referee #1, 17 Dec 2023
    • AC1: 'Reply on RC1', Pengzhen Duan, 15 Jan 2024
    • AC2: 'Reply on RC1', Pengzhen Duan, 15 Jan 2024
  • CC1: 'Comment on cp-2023-87', Xing Cheng, 25 Feb 2024
    • AC3: 'Reply on CC1', Pengzhen Duan, 08 Mar 2024
  • RC2: 'Comment on cp-2023-87', Anonymous Referee #2, 10 Apr 2024
    • AC4: 'Reply on RC2', Pengzhen Duan, 16 Apr 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on cp-2023-87', Anonymous Referee #1, 17 Dec 2023
    • AC1: 'Reply on RC1', Pengzhen Duan, 15 Jan 2024
    • AC2: 'Reply on RC1', Pengzhen Duan, 15 Jan 2024
  • CC1: 'Comment on cp-2023-87', Xing Cheng, 25 Feb 2024
    • AC3: 'Reply on CC1', Pengzhen Duan, 08 Mar 2024
  • RC2: 'Comment on cp-2023-87', Anonymous Referee #2, 10 Apr 2024
    • AC4: 'Reply on RC2', Pengzhen Duan, 16 Apr 2024
Pengzhen Duan, Hanying Li, Zhibang Ma, Jingyao Zhao, Xiyu Dong, Ashish Sinha, Peng Hu, Haiwei Zhang, Youfeng Ning, Guangyou Zhu, and Hai Cheng
Pengzhen Duan, Hanying Li, Zhibang Ma, Jingyao Zhao, Xiyu Dong, Ashish Sinha, Peng Hu, Haiwei Zhang, Youfeng Ning, Guangyou Zhu, and Hai Cheng

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Short summary
We use multiproxy speleothem records to manifest a two drought-one pluvial pattern during 8.5–8.0 ka BP. The different rebounded rainfall amount after two droughts causes different behavior of δ13C, suggesting the dominant role of rainfall threshold on the ecosystem. A comparison of different records suggests the prolonged 8.2 ka event is a globally common phenomenon rather than a regional signal. The variability of the AMOC strength is mainly responsible for these climate changes.