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DOI	10.1016/j.jhydrol.2020.125841
	The transport mechanism of carbon isotopes based on 10 years of cave monitoring: Implications for paleoclimate reconstruction
	Li, Yidong; Yang, Yan; Jiang, Xiuyang; Zhao, Jingyao; Sun, Zhe; Shi, Xiao; Tian, Ning; Yang, Yunyue; Li, Jiancang; Duan, Junwei
通讯作者	Yang, Y (通讯作者)
发表日期	2021
ISSN	0022-1694
EISSN	1879-2707
卷号	592
英文摘要	Cave monitoring is crucial to unraveling the factors controlling carbon isotope compositions and their transportation in karst systems. Here, we report a 10-year (2010 similar to 2019) cave monitoring of carbon isotopes from the plants, soil, cave water, and speleothems in Jiguan Cave, Central China, located on the Chinese north-south divide in an area that is sensitive to the Asian monsoon. The results show that the cave ventilation and soil air CO2 controlled by the local temperature and humidity conditions are responsible for the seasonal variability in the delta C-13(DIC) values. The variation in the delta C-13(DIC) values and trace element ratios of the cave water are sensitive to the local hydrological conditions. Although there is the lag time from precipitation to cave water in drought year, the delta C-13(DIC) and trace element ratios (Mg/Ca, Ba/Ca and Sr/Ca) of cave water are strongly coupled and reflect the extreme drought due to the influence of prior calcite precipitation (PCP) and water-rock interaction. The 10-year monitoring period covered two complete El Nino Southern Oscillation (ENSO) cycles. During the two strong El Nino years (2010 and 2015), the cave drip water delta C-13(DIC) values were negative but the delta O-18 values were positive. This opposite trend is mainly due to their different controlling mechanisms. The rainfall amount and moisture sources are responsible for the delta C-13(DIC) and delta O-18 values of the drip water, respectively. Throughout the karst cave system, the carbon isotopes in Jiguan Cave are continuously enriched when migrating from the vegetation to the soil to the cave drip water to the modern speleothems. Comparisons with the stalagmite delta C-13 records for the nearby Jiguan Cave suggest that stalagmite carbon isotopes may reflect the regional precipitation changes induced by the ENSO on the decadal scale. Overall, we demonstrate that the delta C-13 is a potentially reliable proxy that records the changes in the regional environment, especially precipitation changes, and is also a sensitive indictor that indirectly reflects ENSO.
关键词	SUMMER MONSOON PRECIPITATION PRIOR CALCITE PRECIPITATION HOLOCENE ASIAN MONSOON SOIL ORGANIC-MATTER DRIP-WATER OXYGEN-ISOTOPE SPELEOTHEM CALCITE CENTRAL CHINA JIGUAN CAVE ICE-AGE
英文关键词	Carbon isotopes; Karst hydrology; El Nino Southern Oscillation; Extreme drought events; Modern speleothems
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:000639844900055
来源期刊	JOURNAL OF HYDROLOGY
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/260390
推荐引用方式 GB/T 7714	Li, Yidong,Yang, Yan,Jiang, Xiuyang,et al. The transport mechanism of carbon isotopes based on 10 years of cave monitoring: Implications for paleoclimate reconstruction[J]. 中国科学院青藏高原研究所,2021,592.
APA	Li, Yidong.,Yang, Yan.,Jiang, Xiuyang.,Zhao, Jingyao.,Sun, Zhe.,...&Duan, Junwei.(2021).The transport mechanism of carbon isotopes based on 10 years of cave monitoring: Implications for paleoclimate reconstruction.JOURNAL OF HYDROLOGY,592.
MLA	Li, Yidong,et al."The transport mechanism of carbon isotopes based on 10 years of cave monitoring: Implications for paleoclimate reconstruction".JOURNAL OF HYDROLOGY 592(2021).