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学科主题: Geosciences, Multidisciplinary
题名: East Asian Summer Monsoon variations in the past 12.5 ka: High-resolution delta O-18 record from a precisely dated aragonite stalagmite in central China
作者: [Zhang, Hui-Ling ; Yu, Ke-Fu ; Liu, Guo-Hui] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Zhang, Hui-Ling ; Liu, Guo-Hui] Univ Chinese Acad Sci, Beijing 100049, Peoples R China ; [Zhang, Hui-Ling] Guangdong Ocean Univ, Dept Ocean Engn, Fac Engn, Zhanjiang 524088, Peoples R China ; [Zhang, Hui-Ling ; Yu, Ke-Fu ; Zhao, Jian-Xin ; Feng, Yue-Xing ; Zhou, Wei] Univ Queensland, Sch Earth Sci, Radiogen Isotope Lab, Brisbane, Qld 4072, Australia ; [Lin, Yu-Shi] CAGS, Inst Karst Geol, Key Lab Karst Dynam, Guilin 541004, Peoples R China
通讯作者: zhanghuiling0375@126.com ; kefuyu@scsio.ac.cn ; j.zhao@uq.edu.au ; y.feng@uq.edu.au ; linyush-i1935@163.com ; zhou.vicki@gmail.com ; sdlgbio@126.com
关键词: Aragonite stalagmite ; East Asian Summer Monsoon ; Central China ; Stable isotopes ; U-Th dating
刊名: JOURNAL OF ASIAN EARTH SCIENCES
发表日期: 2013
卷: 73, 页:162-175
部门归属: 海洋地质
资助者: Field investigation and sample collection, XRD analyses and oxygen isotope measurements were supported by the National Key Basic Research Program of China (Nos. 2013CB956102 and 2010CB95950101), the "Strategic Priority Research Program" of the Chinese Academy of Sciences (Grant No. XDA05080300), the National Science Foundation of China (Grant # 40830852 and #41025007). We also acknowledge the support of an ARC discovery grant (Project DP0773081) to Zhao and Yu which covered the costs for Zhang's visit to UQ, oxygen isotope sample preparation, and U/Th dating work. Dr. Yu was a recipient of an Australian Research Fellowship from the ARC (Project DP0773081) when conducting this research. We thank Mr. Xiao-ming Chen of Nanjing Institute of Geology and Palaeontology for his superb technical support for C-O isotope analyses. We thank three anonymous reviewers for their kind and constructive reviews. The post-review revised version of the manuscript has benefited dramatically from incisive comments and suggestions by Prof Houyun Zhou.
摘要: Due to possible aragonite to calcite transformation resulting in alteration in isotopic signatures and a bias in age-dating, aragonite speleothems are often excluded from paleoclimatic archives. However, aragonite stalagmites contain ppm-level uranium content, making them much easier to date, achieving higher age-dating precisions than calcite stalagmites. In this regard, provided aragonite-to-calcite transformation did not occur, aragonite stalagmites are potentially well suited for Holocene climate research, given their climate proxies can be placed into a better constrained chronological framework. In this paper, we present high-precision U/Th dates and O isotopic time series for a 82 cm, long, continuous growth aragonite stalagmite, LH2, from Lianhua Cave, Hunan Province, China, and discuss East Asian Summer Monsoon (EASM) variability for the last 12.5 ka BP (before present). The U/Th-dated delta O-18 sequence with a mean 16-year resolution and the growth rate pattern of LH2 show that EASM experienced a strengthening stage, a strong stage and a weakening stage during the last 12.5 ka. During the YD (12.5-11.5 ka BP), heavy delta O-18 values and low growth rate indicate a weak monsoon period. During the Preboreal (from similar to 11.5 to 10.6 ka BP), delta O-18 values decreased dramatically (similar to 1.94 parts per thousand) reflecting abrupt strengthening of the monsoon. From 10.6 to 4.2 ka BP, the record is characterized by the lightest delta O-18 values and high growth rates, suggesting a strong monsoon period. The summer monsoon weakened substantially after 4.2 ka BP, as inferred from gradually increasing delta O-18 values and decreasing growth rate. Overall, the intensity of the EASM is regulated by summer insolation at 30 degrees N during the last 12.5 ka. Although oxygen isotope fractionation is different between aragonite-H2O and calcite-H2O because of Rayleigh Fractionation Law, the overall temporal pattern of delta O-18 values from aragonite stalagmite LH2 is concordant with other high-resolution Holocene calcite stalagmite records from South China. The comparison among these records shows that the Holocene Optimum was synchronous across Asian continental region influenced by the EASM and Indian Summer Monsoon (ISM), lasting from similar to 10.6 to 4.2 ka BP, as reflected by consistently lighter delta(18)Ovalues among all these records regardless of their latitudinal difference. These records do not support previously reported asynchronism between EASM and ISM. In details, the long-term delta O-18 trend in LH2 is punctuated by a number of centennial fluctuations. For instance, two weak monsoon events occurred at 9232 +/- 57 yr BP and 8137 +/- 21 yr BP, correlating in time with cooling events in Greenland ice cores. The latest weak monsoon event centered at 302 +/- 8 yr BP which is related to the Little Ice Age (LIA). In addition, the monsoon intensity derived from our record also shows a strong connection with latitudinal migration of the Inter-Tropical Convergence Zone (ITCZ) as recorded in the Cariaco Basin sediments. Spectral analysis of delta O-18 values shows that significant peaks match with solar periodicities of 208 yr (de Vries cycle), 86 yr (Gleissberg cycle) or related to Delta C-14 production suggesting shorter-term monsoon variations are forced by solar radiation. Overall, our study suggests that the delta O-18 record in the aragonite stalagmite is highly consistent with those derived from calcite stalagmites, suggesting that aragonite stalagmites are suitable for palaeoclimate reconstruction, especially for the Holocene period, as aragonite calcite transformation has not occurred. (C) 2013 Elsevier Ltd. All rights reserved.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000322929500016
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/11116
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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[Zhang, Hui-Ling; Yu, Ke-Fu; Liu, Guo-Hui] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Zhang, Hui-Ling; Liu, Guo-Hui] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Zhang, Hui-Ling] Guangdong Ocean Univ, Dept Ocean Engn, Fac Engn, Zhanjiang 524088, Peoples R China; [Zhang, Hui-Ling; Yu, Ke-Fu; Zhao, Jian-Xin; Feng, Yue-Xing; Zhou, Wei] Univ Queensland, Sch Earth Sci, Radiogen Isotope Lab, Brisbane, Qld 4072, Australia; [Lin, Yu-Shi] CAGS, Inst Karst Geol, Key Lab Karst Dynam, Guilin 541004, Peoples R China.East Asian Summer Monsoon variations in the past 12.5 ka: High-resolution delta O-18 record from a precisely dated aragonite stalagmite in central China,JOURNAL OF ASIAN EARTH SCIENCES,2013,73():162-175
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