Hydrogeochemical and climatic interpretations of isotopic signals from precipitation to drip waters in Liangfeng Cave, Guizhou Province, China

	Hydrogeochemical and climatic interpretations of isotopic signals from precipitation to drip waters in Liangfeng Cave, Guizhou Province, China
	Guangneng Zeng; Weijun Luo; Shijie Wang; Xuelian Du
	2015
发表期刊	Environmental Earth Sciences
卷号	74 期号:2 页码:1509–1519
摘要	Oxygen isotope is a commonly used proxy for paleoclimatic studies on stalagmites. In order to understand the transmission of isotopic signals from precipitation to stalagmites, meteorological indexes of exterior and interior cave and hydrogeochemical proxies of drip waters in Liangfeng Cave have been monitored from April, 2011 to April, 2013. Samples of rain and drip waters from three drip sites (designated as 1#, 5#, and 6#) are collected for hydrogen and oxygen isotopes testing. Results show that the amount-weighted mean delta O-18 value of rain in the first year (May 9, 2011 to May 1, 2012) is lighter than that in the second (May 30, 2012 to May 2, 2013). This may result from different proportions of the Pacific/Indian Ocean source moistures. The arithmetic mean delta O-18 values of 1#, 5#, and 6# are similar to the multi-year amount-weighted mean delta O-18 value of precipitation. Hydrogeochemical analyses of drip waters reveal that the discharge rates increase in the order of 6# < 1# < 5# and that water/rock reaction, fresh/old water mixing and CO2 degassing exert dominant controls on seepage waters in aquifers. Hard infiltration of rain during dry season (with heavier delta O-18 value) due to its small amount may cause lower mean drip water delta O-18 values (e.g., 1#). Evaporation during the dripping and exuding processes in dry season may result in heavier mean drip water delta O-18 values (e.g., 6#). Considering calcite depositing mostly during dry season, we compare the mean delta O-18 values of drip waters during dry season between the first and second years. Differences exist and share the same trend with rain. The results indicate that drip waters can inherit oxygen isotopic signals of rain. But it is critical to have a "Replication Test" on delta O-18 records of stalagmites from the same cave for paleoclimatic studies. What's more, delta O-18 values in stalagmites feeding by drip waters that have no/little annual delta O-18 variations may be useful to paleotemperature reconstructions.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6037
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Guangneng Zeng,Weijun Luo,Shijie Wang,et al. Hydrogeochemical and climatic interpretations of isotopic signals from precipitation to drip waters in Liangfeng Cave, Guizhou Province, China[J]. Environmental Earth Sciences,2015,74(2):1509–1519.
APA	Guangneng Zeng,Weijun Luo,Shijie Wang,&Xuelian Du.(2015).Hydrogeochemical and climatic interpretations of isotopic signals from precipitation to drip waters in Liangfeng Cave, Guizhou Province, China.Environmental Earth Sciences,74(2),1509–1519.
MLA	Guangneng Zeng,et al."Hydrogeochemical and climatic interpretations of isotopic signals from precipitation to drip waters in Liangfeng Cave, Guizhou Province, China".Environmental Earth Sciences 74.2(2015):1509–1519.

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