兰州大学机构库
Timing and structure of the weak Asian Monsoon event about 73,000 years ago
Du, Wenjing1; Cheng, Hai1,2; Xu, Yao1; Yang, Xunlin3; Zhang, Pingzhong4; Sha, Lijuan1; Li, Hanying1; Zhu, Xiaoyan5; Zhang, Meiliang5; Strikis, Nicolas M.6; Cruz, Francisco W.6; Edwards, R. Lawrence2; Zhang, Haiwei1; Ning, Youfeng1
2019-08
Source PublicationQuaternary Geochronology   Impact Factor & Quartile
ISSN1871-1014
EISSN1878-0350
Volume53
page numbers10
AbstractOxygen isotope (delta O-18) records of cave speleothem have played an important role in the past two decades in characterizing the Asian Monsoon (AM) variability and correlating the monsoonal events with other global climate events on millennial timescales. Of a series of millennial events occurred during the last glacial period, the Chinese Stadial-20 (CS-20, corresponding to the Greenland Stadial-20, GS-20) event around similar to 73 kyr BP (thousand years before present, where present = 1950 AD) is distinctive, since it is the weakest AM event during the last glacial period and is likely linked to the Toba volcanic super-eruption. While Greenland ice core records are commonly used to correlate the last glacial millennial events, yet their absolute age uncertainties around the GS-20 is larger than 1000 years. This prohibits precise correlations of the event between global climate archives from different climate systems to investigate the underlying climatic dynamics. Here, we present three Chinese cave stalagmite delta O-18 records from the AM region, covering a period from 76 to 71 kyr BP, across the CS-20. All stalagmites have high uranium contents and relatively fast growth rates, allowing acquisition of high-resolution (similar to 10 years) delta O-18 records with precise Th-230 age controls (<= 200 years, 2 sigma) to precisely characterize the structure and timing of the CS-20. Our results demonstrate that the onset and termination of the CS-20 are more gradual in Chinese cave records relative to the GS-20 event in Greenland ice core records. As such, we suggest a new 'break-point' approach to correlate CS-20 with GS-20, at either the initial onset or initial termination shifts of the events, instead of the conventional 'mid-point' match. We dated the initial onset and initial termination of CS-20 to similar to 74.0 +/- 0.2 and 72.5 +/- 0.2 kyr BP, respectively, confirming the Greenland ice core chronology well within the quoted uncertainty. The 'break-point' correlation at the GS-20/CS-20 initial termination suggests a lagged onset of CS-20 relative to the onset of GS-20. The lagged onset is in line with a northern high-latitude forcing mechanism triggering the event and a central role of oceanic reorganizations in the propagation of the climate signal. An alternative 'break-point' correlation at the GS-20/CS-20 initial onset suggests that the CS-20 initial termination leads the GS-20 initial termination by a few hundred years. This apparent paradox thus calls for further empirical and theoretical studies to better understand the underlying climatic dynamics and in turn the correlation strategy.
KeywordCave delta O-18 records GS-20 event Structure and timing Climate correlation
PublisherELSEVIER SCI LTD
DOI10.1016/j.quageo.2019.05.002
Indexed BySCIE
Language英语
Funding ProjectUS National Science Foundation[1702816]
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000480376300002
PublisherELSEVIER SCI LTD
Original Document TypeArticle
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/295100
Collection兰州大学
Corresponding AuthorCheng, Hai
Affiliation
1.Xi An Jiao Tong Univ, Inst Global Environm Change, 99 Yanxiang Rd, Xian 710049, Shaanxi, Peoples R China
2.Univ Minnesota, Dept Earth Sci, Minneapolis, MN USA
3.Southwest Univ, Sch Geog Sci, Chongqing, Peoples R China
4.Lanzhou Univ, Sch Geol Sci & Mineral Resources, Lanzhou, Gansu, Peoples R China
5.CAGS, Inst Karst Geol, Karst Dynam Lab, Guilin, Peoples R China
6.Univ Sao Paulo, Inst Geociencias, Sao Paulo, SP, Brazil
Recommended Citation
GB/T 7714
Du, Wenjing,Cheng, Hai,Xu, Yao,et al. Timing and structure of the weak Asian Monsoon event about 73,000 years ago[J]. Quaternary Geochronology,2019,53.
APA Du, Wenjing.,Cheng, Hai.,Xu, Yao.,Yang, Xunlin.,Zhang, Pingzhong.,...&Ning, Youfeng.(2019).Timing and structure of the weak Asian Monsoon event about 73,000 years ago.Quaternary Geochronology,53.
MLA Du, Wenjing,et al."Timing and structure of the weak Asian Monsoon event about 73,000 years ago".Quaternary Geochronology 53(2019).
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