气候变化领域集成服务门户(CCPortal): Inconsistency between records of delta O-18 and trace element ratios from stalagmites: Evidence for increasing mid-late Holocene moisture in arid central Asia

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DOI	10.1177/0959683619887431
	Inconsistency between records of delta O-18 and trace element ratios from stalagmites: Evidence for increasing mid-late Holocene moisture in arid central Asia
	Liu, Xiaokang; Liu, Jianbao; Shen, Chuan-Chou; Yang, Yan; Chen, Jianhui; Chen, Shengqian; Wang, Xianfeng; Wu, Chung-Che; Chen, Fahu
通讯作者	Liu, JB (通讯作者)
发表日期	2020
ISSN	0959-6836
EISSN	1477-0911
起始页码	369
结束页码	379
卷号	30 期号:3
英文摘要	The interpretation of trace element/calcium ratios of speleothems as indicators of local hydroclimatic variability in the vicinity of caves has led to controversy in reconstructing the evolution of moisture conditions in arid central Asia (ACA) during the Holocene. Here we present records of Mg/Ca, Sr/Ca, Ba/Ca, and U/Ca from precisely dated stalagmites from Baluk cave in Xinjiang (northwest China), spanning the past 9370 years. The co-variations of the trace element ratios, together with the slopes of the regression lines of the corresponding logarithmically transformed data, suggest that they are dominated by prior calcite precipitation (PCP) and thus can be used as reliable proxies of changes in moisture/precipitation. The trace element ratios are relatively high during 9 to 5 ka and lower from 5 ka to the present, indicating a trend of increasing mid-late Holocene moisture in ACA. The long-term trend of variation of the trace element ratios is correlative with two other records of speleothem trace element ratios from caves in ACA: Kesang cave (western Xinjiang) and Ton cave (Uzbekistan). This spatial coherency of the trend of inferred moisture conditions from three caves that are separated by hundreds of kilometers demonstrates that speleothem trace element ratios are indicative of large spatial scale rather than local hydroclimatic variability in ACA during the Holocene. However, the long-term trend of variation of the trace element ratios is the inverse of the corresponding oxygen isotope (delta O-18) records from the same cave sites, which implies that Holocene speleothem delta O-18 records do not represent changes in the precipitation amount in ACA; rather, they most likely reflect moisture sources and related water vapor transport controlled by Northern Hemisphere summer insolation (NHSI). Our findings provide new evidence for a 'westerlies-dominated climatic regime', which influenced hydroclimatic changes in ACA during the Holocene.
关键词	NORTHERN XINJIANG SUMMER MONSOON ISOTOPIC COMPOSITION LATE PLEISTOCENE CLIMATIC CHANGES WETTING TREND SPELEOTHEM CAVE CHINA LAKE
英文关键词	arid central Asia; Holocene moisture; precipitation; inconsistent trends; speleothem delta O-18; speleothem trace element ratios; westerlies circulation
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000498515700001
来源期刊	HOLOCENE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260011
推荐引用方式 GB/T 7714	Liu, Xiaokang,Liu, Jianbao,Shen, Chuan-Chou,et al. Inconsistency between records of delta O-18 and trace element ratios from stalagmites: Evidence for increasing mid-late Holocene moisture in arid central Asia[J]. 中国科学院青藏高原研究所,2020,30(3).
APA	Liu, Xiaokang.,Liu, Jianbao.,Shen, Chuan-Chou.,Yang, Yan.,Chen, Jianhui.,...&Chen, Fahu.(2020).Inconsistency between records of delta O-18 and trace element ratios from stalagmites: Evidence for increasing mid-late Holocene moisture in arid central Asia.HOLOCENE,30(3).
MLA	Liu, Xiaokang,et al."Inconsistency between records of delta O-18 and trace element ratios from stalagmites: Evidence for increasing mid-late Holocene moisture in arid central Asia".HOLOCENE 30.3(2020).