Data-model comparison of soil–water δ 18 O at a temperate site in N. Spain with implications for interpreting speleothem δ 18 O

Comas-Bru, Laia; McDermott, Frank

doi:10.1016/j.jhydrol.2015.09.053

Cited by 19 publications

(16 citation statements)

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“…It was shown that the MTT estimations in the soil depend on the applied travel time model [ Timbe et al ., ] and also the sampling frequency has an influence on the estimates of MTT [ Timbe et al ., ]. An alternative dynamic model approach is a combination of mixing and piston flow assumptions, which were shown to be able to simulate the temporal variable travel times through a lysimeter [ Lindström and Rodhe , ] or the stable isotope dynamics of mobile water in 0.6 m soil depth [ Comas‐Bru and McDermott , ]. Given the hydroecological feedbacks presented in the previous sections, which influence the water flow and solute transport, lumped convolution approaches that do not consider transient water flow and evapotranspiration losses within the soil profile seem to oversimplify the processes.…”

Section: Processes In the Soilmentioning

confidence: 99%

“…Ultimately, the investigation of the evaporation and the accompanied fractionation in the topsoil depends on the method of choice for the pore water stable isotope sampling. Studies using zero tension, suction lysimeters, or wick samplers, which only investigate water in the large pore sizes, reported only little to no fractionation in the top soil [e.g., Landon et al, 2000;Asano et al, 2002;Timbe et al, 2014;Muñoz-Villers and McDonnell, 2012;Kim and Jung, 2014;Geris et al, 2015;Comas-Bru and McDermott, 2015], while other studies using centrifugation [Kudo et al, 2013], cryogenic vacuum extraction [e.g., Brooks et al, 2010;Goldsmith et al, 2012], or the direct equilibration [e.g., Garvelmann et al, 2012;Bertrand et al, 2012] found a fractionation in the upper soil layer. However, recent publications showed that especially the latter two methods are not necessarily comparable [Orlowski et al, 2016b].…”

Section: 1002/2015rg000515mentioning

confidence: 99%

“…This intense dampening of the rainfall signal in the upper 0.5 m of the soil is related to canopy and litter interception, root water uptake, and preferential uptake during the vegetation season in addition to dispersion Gehrels et al, 1998;Brodersen et al, 2000;Tang and Feng, 2001;Gazis and Feng, 2004;O'Driscoll et al, 2005;Comas-Bru and McDermott, 2015]. A "critical depth," defined as the depth at which annual variations in the isotopic composition do not exceed the analytical precision, can be derived [Clark and Fritz, 1997]. The analytical precision for pore water stable isotope analysis is usually reported to be between 0.2 to 0.5‰ for δ 18 O and 0.7 to 2‰ for δ 2 H, as reviewed in Sprenger et al [2015b].…”

Section: Percolation and Groundwater Rechargementioning

confidence: 99%

“…While the pore water isotopic composition in the top 0.1 m varies usually as much or even more (due to evaporative enrichment see section 3.2) than the isotopic signal of the precipitation, the pore water isotope dynamic is highly damped within the upper 0.5 m (Figure ). This intense dampening of the rainfall signal in the upper 0.5 m of the soil is related to canopy and litter interception, root water uptake, and preferential uptake during the vegetation season in addition to dispersion [ Stewart and McDonnell , ; Gehrels et al ., ; Brodersen et al ., ; Tang and Feng , ; Gazis and Feng , ; O ' Driscoll et al ., ; Comas‐Bru and McDermott , ]. A “critical depth,” defined as the depth at which annual variations in the isotopic composition do not exceed the analytical precision, can be derived [ Clark and Fritz , ].…”

Section: Processes In the Soilmentioning

confidence: 99%

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Illuminating hydrological processes at the soil‐vegetation‐atmosphere interface with water stable isotopes

Sprenger

Leistert

Gimbel

et al. 2016

Reviews of Geophysics

418

382

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Water stable isotopes (18O and 2H) are widely used as ideal tracers to track water through the soil and to separate evaporation from transpiration. Due to the technical developments in the last two decades, soil water stable isotope data have become easier to collect. Thus, the application of isotope methods in soils is growing rapidly. Studies that make use of soil water stable isotopes often have a multidisciplinary character since an interplay of processes that take place in the vadose zone has to be considered. In this review, we provide an overview of the hydrological processes that alter the soil water stable isotopic composition and present studies utilizing pore water stable isotopes. The processes that are discussed include the water input as precipitation or throughfall, the output as evaporation, transpiration, or recharge, and specific flow and transport processes. Based on the review and supported by additional data and modeling results, we pose a different view on the recently proposed two water world hypothesis. As an alternative to two distinct pools of soil water, where one pool is enriched in heavy isotopes and used by the vegetation and the other pool does not undergo isotopic fractionation and becomes recharge, the water gets successively mixed with newly introduced rainwater during the percolation process. This way, water initially isotopically enriched in the topsoil loses the fractionation signal with increasing infiltration depth, leading to unfractionated isotopic signals in the groundwater.

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Section: Processes In the Soilmentioning

confidence: 99%

Section: 1002/2015rg000515mentioning

confidence: 99%

Section: Percolation and Groundwater Rechargementioning

confidence: 99%

Section: Processes In the Soilmentioning

confidence: 99%

See 2 more Smart Citations

Illuminating hydrological processes at the soil‐vegetation‐atmosphere interface with water stable isotopes

Sprenger

Leistert

Gimbel

et al. 2016

Reviews of Geophysics

418

382

View full text Add to dashboard Cite

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“…Recycling of moisture contributing to Postojna precipitation takes place mostly in central and eastern Europe, where hydrological balance is often positive (e.g., Wriedt and Bouraoui, 2009) and transpiration is enhanced versus precipitation (e.g., Granier et al, 2000;Domínguez-Villar et al, 2018). Soil water in temperate European sites have shown a limited impact of evaporation on the oxygen isotope signature (Comas-Bru and McDermott, 2015;Riechelmann et al, 2017).…”

Section: Moisture Sources Control On 18 O Values Of Precipitationmentioning

confidence: 99%

The impact of moisture sources on the oxygen isotope composition of precipitation at a continental site in central Europe

Krklec

Domínguez‐Villar

Lojen

2018

Journal of Hydrology

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Typhoon rainfall impact on drip water δ¹⁸O in Xianyun cave, Southeast China

Yang

Zhang

et al. 2021

Hydrological Processes

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Precisely dated high-resolution speleothems may record past typhoon events, however, the state of the art cave monitoring is a prerequisite to identify suitable stalagmites for the reconstruction of such events. With this motivation, we examined the isotopic composition (δ 18 O and d-excess values) of rainfall, outside river, cave drip water, and an underground river in the Xianyun cave system, located in southeastern China. Monthly to bimonthly monitoring of environmental and isotopic conditions was conducted for 1 year, from December 2018 to December 2019, including a typhoon event (August 24, 2019 to August 26, 2019), called Bailu. The δ 18 O of rainfall samples over the cave and outside river water ranged from −9.7‰ to −1.9‰ and −8.2‰ to −6.3‰, respectively, while the δ 18 O of Typhoon Bailu rainfall and instantaneous outside river water ranged from −19.6‰ to −6.3‰ and −10.4‰ to −7.7‰, respectively. Typhoon Bailu-induced rainfall showed distinctly negative δ 18 O values as compared to those of the monthly and bimonthly rainfall, exhibiting a three-stage inverted U-shaped variation characteristic. Four drip water monitoring sites inside the cave revealed low variations during the studied period with average values of −7.8‰, −8.0‰, −8.0‰, and −8.1‰. However, during the typhoon, the drip water δ 18 O values exhibited similar characteristic as outside rainfall but with just 0.2‰ negative deviation owing to precipitation amount and drip water source reservoir. The integration of rainfall amount with drip water source reservoir determines the degree to which a typhoon isotopic signature gets diluted during epikarst infiltration. This study provides the first instrumental evidence of typhoon signal in karst system in southeastern China. Our results imply that the δ 18 O of drip water in Xianyun cave can instantaneously respond to typhoon rainfall. However, the 0.2‰ shift in drip water δ 18 O is difficult to be recorded by speleothems. We suggest multiyear monitoring to ascertain fully if the stalagmites could be used as paleotyphoon proxy.

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Data-model comparison of soil–water δ 18 O at a temperate site in N. Spain with implications for interpreting speleothem δ 18 O

Cited by 19 publications

References 48 publications

Illuminating hydrological processes at the soil‐vegetation‐atmosphere interface with water stable isotopes

Illuminating hydrological processes at the soil‐vegetation‐atmosphere interface with water stable isotopes

The impact of moisture sources on the oxygen isotope composition of precipitation at a continental site in central Europe

Typhoon rainfall impact on drip water δ¹⁸O in Xianyun cave, Southeast China

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Data-model comparison of soil–water δ 18 O at a temperate site in N. Spain with implications for interpreting speleothem δ 18 O

Cited by 19 publications

References 48 publications

Illuminating hydrological processes at the soil‐vegetation‐atmosphere interface with water stable isotopes

Illuminating hydrological processes at the soil‐vegetation‐atmosphere interface with water stable isotopes

The impact of moisture sources on the oxygen isotope composition of precipitation at a continental site in central Europe

Typhoon rainfall impact on drip water δ18O in Xianyun cave, Southeast China

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Product

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Typhoon rainfall impact on drip water δ¹⁸O in Xianyun cave, Southeast China