气候变化领域集成服务门户(CCPortal): Potential ENSO effects on the oxygen isotope composition of modern speleothems: Observations from Jiguan Cave, central China

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DOI	10.1016/j.jhydrol.2018.09.015
	Potential ENSO effects on the oxygen isotope composition of modern speleothems: Observations from Jiguan Cave, central China
	Sun, Zhe; Yang, Yan; Zhao, Jingyao; Tian, Ning; Feng, Xiangxiang
通讯作者	Yang, Y (通讯作者)
发表日期	2018
ISSN	0022-1694
EISSN	1879-2707
起始页码	164
结束页码	174
卷号	566
英文摘要	Despite of the fast development of speleothem records, oxygen isotope (delta O-18), the main paleoclimatic proxy, remains complicated in climatic interpretation. Continuous cave monitoring is essential for understanding the response of stalagmite oxygen isotope to East Asian Summer Monsoon moisture transportation. We introduce a 7 years (2010-2016) study on oxygen isotope of atmospheric precipitation, cave drips and modern speleothems at Jiguan Cave, central China, located Chinese north-south divide where is sensitive to Asian Monsoon. The monitoring covered a whole ENSO (El Nino Southern Oscillation) cycle, from El Nino in 2010 to La Nina in 2011 and recovered another El Nino in 2015. The precipitation delta O-18 shows obvious seasonality (negative in summer and positive in winter), but air temperature and rainfall amount are not primary controlling factors. The interannual delta O-18 of precipitation corresponds with ENSO variability, which means delta O-18 value is positive during El Nino event and vice versa. We used HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory) model to simulate the moisture transportation for rainy season in El Nino and La Nina years, and found the Pacific contributed over 50% moisture in El Nino years and the Indian Ocean was the predominant oceanic source in La Nina year. There is no seasonality in drips delta O-18 value, while the response to ENSO variability is evident on interannual scale. The stable negative delta O-18 of drips compared with precipitation indicate there is a threshold for infiltration, suggesting cave drips are recharged by summer heavy precipitation with light delta O-18 value, but it's the mixture of latest and former rainy precipitation that recharge drips in drought, which has been verified by simple infiltration model. We found the modern speleothems were precipitated under nonequilibrium fractionation during drought years, nevertheless, they can record the El Nino related delta O-18 positive anomaly. Overall, the modern speleothems can receive the precipitation delta O-18 signal transferred by drips, and our study offers significance for verification of Asian Summer Monsoon driving force and interpretation of stalagmite delta O-18.
关键词	ASIAN SUMMER MONSOON ICE-AGE TERMINATIONS STABLE-ISOTOPE DRIP-WATER PALEOCLIMATE RECONSTRUCTIONS PRECIPITATION ISOTOPES SEASONAL-VARIATIONS MOISTURE SOURCES LIANGFENG CAVE SW CHINA
英文关键词	Oxygen isotope; Precipitation; Karst drip water; Modern speleothems; El Nino Southern Oscillation; Jiguan Cave; Central China
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:000449901100012
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/259250
推荐引用方式 GB/T 7714	Sun, Zhe,Yang, Yan,Zhao, Jingyao,et al. Potential ENSO effects on the oxygen isotope composition of modern speleothems: Observations from Jiguan Cave, central China[J]. 中国科学院青藏高原研究所,2018,566.
APA	Sun, Zhe,Yang, Yan,Zhao, Jingyao,Tian, Ning,&Feng, Xiangxiang.(2018).Potential ENSO effects on the oxygen isotope composition of modern speleothems: Observations from Jiguan Cave, central China.JOURNAL OF HYDROLOGY,566.
MLA	Sun, Zhe,et al."Potential ENSO effects on the oxygen isotope composition of modern speleothems: Observations from Jiguan Cave, central China".JOURNAL OF HYDROLOGY 566(2018).