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Climatic and anthropogenic impacts on δ13C variations in a stalagmite from central China.
Tan, LC (Tan, Liangcheng)[ 1 ]; Zhang, HW (Zhang, Haiwei)[ 1,2 ]; Qin, SJ (Qin, Shijiang)[ 1 ]; An, ZS (An, Zhisheng)[ 1 ]
2013-06
Source PublicationTerrestrial Atmospheric and Oceanic Sciences
Volume24Issue:3Pages:333-343
Subtype期刊论文
Abstract

In this paper, we present a delta C-13 record that covers the past 750 years at a resolution of 2 - 3 years which was preserved in a precisely dated stalagmite (DY-1) obtained from the Dayu Cave on the south flank of the Qinling Mountains in central China. Between 1249 AD and 1800 AD, climate-induced vegetation changes appear to have been the primary control on delta C-13 values at a centennial scale. Variations in precipitation amounts control the residence time of seepage water and may have affected the dissolution of bedrock, prior carbonate precipitation in the unsaturated zone above the cave, and the degassing of CO2 within the cave. These hydrogeochemical processes are likely to have been the most important controls on delta C-13 levels over annual to decadal scales, and may also have influenced centennial-scale variations. The reduced delta C-13 value of atmospheric CO2 since the Industrial Revolution may have caused the decreasing trend in delta C-13 values seen in stalagmite DY-1 after 1800 AD. Increased visitor numbers in the unventilated Dayu Cave over time produced a large amount of CO2, and maintained a raised level of pCO(2) in the cave air. This artificially enhanced pCO(2) may have decreased the fraction of CO2 degassing, and hence carbonate precipitation, which could partly cause the decreasing trend in the stalagmite delta C-13 seen over the past 200 years.

KeywordStalagmite Carbon Isotopes Climate Anthropogenic Impact
DOI10.3319/TAO.2012.12.27.01(TT)
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9994
Collection现代环境研究室
Corresponding AuthorTan, LC (Tan, Liangcheng)[ 1 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment,Chinese Academy of Sciences, Xi’an, China;
2.University of Chinese Academy of Sciences, Beijing, China
Recommended Citation
GB/T 7714
Tan, LC ,Zhang, HW ,Qin, SJ ,et al. Climatic and anthropogenic impacts on δ13C variations in a stalagmite from central China.[J]. Terrestrial Atmospheric and Oceanic Sciences,2013,24(3):333-343.
APA Tan, LC ,Zhang, HW ,Qin, SJ ,&An, ZS .(2013).Climatic and anthropogenic impacts on δ13C variations in a stalagmite from central China..Terrestrial Atmospheric and Oceanic Sciences,24(3),333-343.
MLA Tan, LC ,et al."Climatic and anthropogenic impacts on δ13C variations in a stalagmite from central China.".Terrestrial Atmospheric and Oceanic Sciences 24.3(2013):333-343.
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