Lithium isotopes and partition coefficients in inorganic carbonates: Proxy calibration for weathering reconstruction

Day, Christopher C.; Strandmann, Philip A.E. Pogge von; Mason, Andrew J.

doi:10.1016/j.gca.2021.02.037

Cited by 21 publications

(26 citation statements)

References 76 publications

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“…(a) δ 13 C spel vs. age, colour-coded by cave. Villars Cave -stalagmites Vil-stm11(Genty et al, 2006) andVil-car-1 (Wainer et al, 2011); Chauvet Cave -stalagmite Chau-stm6(Genty et al, 2006); El Pindal Cave (studied here)-previously published record from stalagmite Candela(Moreno et al, 2010); La Garma Cave -stalagmite GAR-01(Baldini et al, 2015); El Soplao Cave -stalagmite SIR-1(Rossi et al, 2018); Père Noël Cave -stalagmite PN-95-5(Verheyden et al, 2014); Buraca Gloriosa -stalagmite BG6LR(Denniston et al, 2018). All stalagmite data were extracted from the SISAL database, version 2(Comas-Bru et al, 2020b, a).…”

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confidence: 64%

“…The code used for calculation of the stalagmite dead carbon fraction can be found at (https://github. com/flechleitner/DCF_calculator, last access: 16 September 2021, and https://doi.org/10.5281/zenodo.5503025, Lechleitner, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Speleothem carbon isotope (δ 13 C spel ) records from the temperate region of western Europe are often clearly correlated to regional temperature reconstructions during the last glacial (Genty et al, 2003) and the deglaciation (Baldini et al, 2015;Denniston et al, 2018;Genty et al, 2006;Moreno et al, 2010;Rossi et al, 2018;Verheyden et al, 2014) (Fig. 1), pointing towards a regionally coherent mechanism driving the response to the temperature increase.…”

Section: Introductionmentioning

confidence: 94%

“…Furthermore, a change in respired substrate over time, leading to a shift in the soil respired endmember δ 13 C (Boström et al, 2007), could lead to higher Q 10 than the global mean. We can exclude changes in vegetation assemblage from C4 to C3 plants, as there is no evidence for the widespread presence of C4 plants during the glacial in the NW Iberian Peninsula (Moreno et al, 2010) or elsewhere at temperate western European sites (Denniston et al, 2018;Genty et al, 2006Genty et al, , 2003. A change in the balance between heterotrophic and autotrophic respiration is another possibility that would influence the soil gas δ 13 C. Changes in temperature affect root and microbial respiration differently (Wang et al, 2014), as do changes in other environmental variables, e.g.…”

Section: Estimation Of the Soil Respired End-member From Cave Airmentioning

confidence: 99%

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Stalagmite carbon isotopes suggest deglacial increase in soil respiration in western Europe driven by temperature change

et al. 2021

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Abstract. The temperate region of western Europe underwent significant climatic and environmental change during the last deglaciation. Much of what is known about the terrestrial ecosystem response to deglacial warming stems from pollen preserved in sediment sequences, providing information on vegetation composition. Other ecosystem processes, such as soil respiration, remain poorly constrained over past climatic transitions but are critical for understanding the global carbon cycle and its response to ongoing anthropogenic warming. Here we show that speleothem carbon isotope (δ13Cspel) records may retain information on soil respiration and allow its reconstruction over time. While this notion has been proposed in the past, our study is the first to rigorously test it, using a combination of multi-proxy geochemical analysis (δ13C, Ca isotopes, and radiocarbon) on three speleothems from the NW Iberian Peninsula and quantitative forward modelling of processes in soil, karst, and cave. Our study is the first to quantify and remove the effects of prior calcite precipitation (PCP, using Ca isotopes) and bedrock dissolution (using the radiocarbon reservoir effect) from the δ13Cspel signal to derive changes in respired δ13C. The coupling of soil gas pCO2 and δ13C via a mixing line describing diffusive gas transport between an atmospheric and a respired end-member allows the modelling of changes in soil respiration in response to temperature. Using this coupling and a range of other parameters describing carbonate dissolution and cave atmospheric conditions, we generate large simulation ensembles from which the results most closely matching the measured speleothem data are selected. Our results robustly show that an increase in soil gas pCO2 (and thus respiration) is needed to explain the observed deglacial trend in δ13Cspel. However, the Q10 (temperature sensitivity) derived from the model results is higher than current measurements, suggesting that part of the signal may be related to a change in the composition of the soil respired δ13C, likely from changing substrate through increasing contribution from vegetation biomass with the onset of the Holocene.

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confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Estimation Of the Soil Respired End-member From Cave Airmentioning

confidence: 99%

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Stalagmite carbon isotopes suggest deglacial increase in soil respiration in western Europe driven by temperature change

et al. 2021

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“…While there is general agreement that there is no temperature effect on Li isotope fractionation in calcite ( 6 , 7 , 30 , 31 ), a negative relationship between pH and calcite δ 7 Li has been reported for some epibenthic foraminifera ( 30 ) and inorganic calcite ( 32 ). However, other studies directly contradict this ( 31 ), leaving an uncertainty in the potential influence of pH on δ 7 Li.…”

Section: Resultsmentioning

confidence: 99%

Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum

et al. 2021

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The Paleocene-Eocene Thermal Maximum (PETM; ~55.9 Ma) was a geologically rapid warming period associated with carbon release, which caused a marked increase in the hydrological cycle. Here, we use lithium (Li) isotopes to assess the global change in weathering regime, a critical carbon drawdown mechanism, across the PETM. We find a negative Li isotope excursion of ~3‰ in both global seawater (marine carbonates) and in local weathering inputs (detrital shales). This is consistent with a very large delivery of clays to the oceans or a shift in the weathering regime toward higher physical erosion rates and sediment fluxes. Our seawater records are best explained by increases in global erosion rates of ~2× to 3× over 100 ka, combined with model-derived weathering increases of 50 to 60% compared to prewarming values. Such increases in weathering and erosion would have supported enhanced carbon burial, as both carbonate and organic carbon, thereby stabilizing climate.

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Demystifying diagenesis: The future of diagenetic inquiry in the geosciences

Fantle,

Lloyd

2025

Treatise on Geochemistry

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Lithium isotopes and partition coefficients in inorganic carbonates: Proxy calibration for weathering reconstruction

Cited by 21 publications

References 76 publications

Stalagmite carbon isotopes suggest deglacial increase in soil respiration in western Europe driven by temperature change

Stalagmite carbon isotopes suggest deglacial increase in soil respiration in western Europe driven by temperature change

Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum

Demystifying diagenesis: The future of diagenetic inquiry in the geosciences

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