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, Na; Yang, Yunyue; Li, Jiancang; Duan, Junwei

doi:10.1016/j.jhydrol.2020.125841

Cited by 21 publications

(5 citation statements)

References 97 publications

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“…S1), as aforementioned, although the limitations of resolution and age deviation exist among them. Furthermore, the newly modern monitoring results show that the cave drip water δ 13 CDIC is definitely a potential proxy for reflecting regional monsoon rainfall on the inter-annual to decadal scales (Li et al, 2021;Yin et al, 2021). Therefore, within subtropical or moderate monsoon regime, advanced bio-productivity (e.g., vegetation and microbial activity) associated with warm and humid climates, will produce high soil CO2 partial pressure (pCO2) and lead to lower δ 13 C values in cave feeding water.…”

Section: Calcite δ 13 Cmentioning

confidence: 99%

“…Moreover, modern cave observations show the δ 13 CDIC and trace elemental ratios in cave drip solution (or stalagmite formation) are clearly responsive to the local hydroclimatic variations, especially during the flood and drought events (Chen and Li, 2018;Yin et al, 2021). Therefore, they can definitely be used as the potential indicators for regional monsoon rainfall changes on the inter-annual to decadal scales (Li et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strong coupling of the East Asian summer monsoon and hydroclimate footprints during 53–47 ka

Huang

Jia

Shao

et al. 2022

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Calcite δ 13 Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strong coupling of the East Asian summer monsoon and hydroclimate footprints during 53–47 ka

Huang

Jia

Shao

et al. 2022

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Similar to the proxies of oxygen and carbon isotopes and trace elements in stalagmites, understanding the significance of organic matter in stalagmite paleoclimate reconstruction through modern cave monitoring and deciphering the signal transmission and mechanisms of organic matter in karst systems is particularly important. Long-term monitoring studies in caves have primarily focused on stable isotopes (δ 18 O, δ 13 C) [12][13][14][15][16] and trace elements (Mg, Ca Ba Sr) as representatives of inorganic geochemical processes with climatic implications [17][18][19][20]; relatively less attention has been paid to organic geochemical processes [3,[21][22][23][24]. Currently, the modern monitoring of organic matter in caves has been limited in duration, with the majority of studies focused on investigating the mechanisms behind the formation of fluorescent luminescence laminae in stalagmites [10,25,26].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Influencing Factors of Dissolved Organic Matter in Cave Drip Water—A Case Study from Furong Cave, Southwest China

He,

Li,

et al. 2024

Water

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Understanding the hydrological processes of dissolved organic matter (DOM) in the surface karst zone is crucial for the utilization and safety of groundwater resources. However, research on DOM in drip water from karst caves is limited. In this study, continuous monitoring was conducted for four years at four drip water monitoring sites (MP1, MP2, MP3, and MP9) in Furong Cave, Southwest China. The three-dimensional fluorescence excitation–emission spectroscopy (3D-EEM) and fluorescence region integration (FRI) methods were employed, along with correlation analysis, to investigate the spectral characteristics, composition, sources, and influencing factors of the DOM in the drip water of Furong Cave. The results indicated that (1) the three-dimensional fluorescence peaks in the drip water were classified into six categories: A, B, C, T, Ti, and M. (2) The dominant source of the drip water DOM is endogenous organic matter. (3) The FRI analysis indicates a relatively high proportion of Type II substances in the drip water, predominantly composed of tryptophan-like substances. (4) The DOM in the drip water of Furong Cave was influenced by various factors, including the mixing effect of “new” and “old” water, water residence time in karst systems, and water–rock interactions (WRI), resulting in the complex responses of drip rates and DOM to surface precipitation and temperature at different drip water sites. This study provides a reference for comparative research on DOM in cave drip water in karst regions, which contributes to a better understanding of the migration mechanism of DOM in karst aquifers under different climate and karst ecological conditions.

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“…Carbon isotopes are an essential and widely used source of information for a broad range of research fields, including carbon cycle studies (e.g., Spiker 1980;Repasch et al 2021), paleoclimate investigations (e.g., Rudzka et al 2011;Li et al 2021), and forensic sciences (e.g., Alkass et al 2011). Radiocarbon tracks atmospheric 14 C concentrations and carries information about ages (Arnold and Libby 1949) or residence times (Reddy et al 2002).…”

Section: Introductionmentioning

confidence: 99%

A UNIVERSAL GAS INTERFACE FOR SIMULTANEOUS ¹⁴C AND δ¹³C MEASUREMENTS

Wertnik,

Wacker,

Bernasconi

et al. 2023

Radiocarbon

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While simultaneous radiocarbon and δ13C measurements have been available for organic materials (by accelerator mass spectrometry, AMS, and isotope ratio mass spectrometry, IRMS, respectively), this has not been possible for carbonates until now. Using an existing interface for gas ion source AMS measurements, we developed a prototype for a universal gas interface that allows simultaneous measurement of both carbon isotope ratios from potentially any source of CO2. First results obtained from reference materials (IAEA-C6, OxaII, PhA, IAEA-C1, IAEA-C2, ETH-4) show that for both organic as well as carbonate samples, the precision of radiocarbon measurements in the coupled mode is comparable to routine standalone AMS measurements. For IRMS δ13C measurements, the performance for different materials shows more variation with precisions ranging from 0.07‰ to 0.47‰. However, both organic materials and carbonates can achieve precisions as good as 0.13‰. Once fully automated, the method shows potential for filling the gap of simultaneous carbon isotope measurements for non-organic materials.

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The transport mechanism of carbon isotopes based on 10 years of cave monitoring: Implications for paleoclimate reconstruction

Cited by 21 publications

References 97 publications

Strong coupling of the East Asian summer monsoon and hydroclimate footprints during 53–47 ka

Strong coupling of the East Asian summer monsoon and hydroclimate footprints during 53–47 ka

Characteristics and Influencing Factors of Dissolved Organic Matter in Cave Drip Water—A Case Study from Furong Cave, Southwest China

A UNIVERSAL GAS INTERFACE FOR SIMULTANEOUS ¹⁴C AND δ¹³C MEASUREMENTS

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The transport mechanism of carbon isotopes based on 10 years of cave monitoring: Implications for paleoclimate reconstruction

Cited by 21 publications

References 97 publications

Strong coupling of the East Asian summer monsoon and hydroclimate footprints during 53–47 ka

Strong coupling of the East Asian summer monsoon and hydroclimate footprints during 53–47 ka

Characteristics and Influencing Factors of Dissolved Organic Matter in Cave Drip Water—A Case Study from Furong Cave, Southwest China

A UNIVERSAL GAS INTERFACE FOR SIMULTANEOUS 14C AND δ13C MEASUREMENTS

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A UNIVERSAL GAS INTERFACE FOR SIMULTANEOUS ¹⁴C AND δ¹³C MEASUREMENTS