A review of single-sample-based models and other approaches for radiocarbon dating of dissolved inorganic carbon in groundwater

Han, L.F.; Plummer, L. Niel

doi:10.1016/j.earscirev.2015.11.004

Cited by 116 publications

(119 citation statements)

References 84 publications

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“…The Han-Plummer plot suggests that DIC in Group 3 wells is influenced by water-rock interactions, including calcite and dolomite dissolution as well as isotopic exchange between DIC and calcite (Wigley, 1976;Han and Plummer, 2016).…”

Section: Biogeochemical Processes Affecting Group 3 Wellsmentioning

confidence: 99%

“…Isotopic exchange, which can occur either in the soil by reaction between soil CO 2 and DIC or in the saturated zone be-tween DIC and solid carbonates, can also be identified with the graphical method. Isotopic exchange in the soil zone, which is usually accompanied by slow water infiltration (Han and Plummer, 2016), would shift δ 13 C and 14 C from Tamer's point towards values close to A , whereas the endpoint of DIC fully equilibrated with respect to soil CO 2 can be derived according to Han and Plummer (2016):…”

Section: Han-plummer Plotmentioning

confidence: 99%

“…Processes affecting DIC and its isotopic composition include calcite-dolomite dissolution (Tamers et al, 1975), isotopic exchange under open or closed conditions (Fontes and Garnier, 1979;Eichinger, 1983;Han and Plummer, 2013), heterotrophic respiration of organic matter (Aravena et al, 1995), as well as precipitation and recrystallization of calcite (Wigley, 1976). Adjustment models exist for most of the mentioned processes, which can be applied in order to determine the initial 14 C concentration (Han and Plummer, 2016). The Han-Plummer plot can help to identify processes that affect the DIC isotopic signature.…”

Section: Han-plummer Plotmentioning

confidence: 99%

“…ε a/g and ε g/b are the respective carbon isotope fractionation factor of gaseous CO 2 and dissolved CO 2 and gaseous CO 2 and HCO − 3 . Isotopic exchange under closed conditions would include isotope exchange reactions between DIC and CaCO 3 and shift δ 13 C and 14 C values in direction to the calcite endmember C. Fully equilibrated DIC isotopic signatures can be derived according to Han and Plummer (2016):…”

Section: Han-plummer Plotmentioning

confidence: 99%

“…In order to determine initial 14 C concentrations in DIC, numerous correction models have been applied to account for the different processes that affect DIC and bias 14 C ages (Han and Plummer, 2016). Corrections have to be considered for dissolution of carbonates by dissolved CO 2 (Tamers et al, 1975) …”

Section: Introductionmentioning

confidence: 99%

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Carbon isotopes of dissolved inorganic carbon reflect utilization of different carbon sources by microbial communities in two limestone aquifer assemblages

Nowak

Schwab

Lazar

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Isotopes of dissolved inorganic carbon (DIC) are used to indicate both transit times and biogeochemical evolution of groundwaters. These signals can be complicated in carbonate aquifers, as both abiotic (i.e., carbonate equilibria) and biotic factors influence the δ 13 C and 14 C of DIC. We applied a novel graphical method for tracking changes in the δ 13 C and 14 C of DIC in two distinct aquifer complexes identified in the Hainich Critical Zone Exploratory (CZE), a platform to study how water transport links surface and shallow groundwaters in limestone and marlstone rocks in central Germany. For more quantitative estimates of contributions of different biotic and abiotic carbon sources to the DIC pool, we used the NETPATH geochemical modeling program, which accounts for changes in dissolved ions in addition to C isotopes.Although water residence times in the Hainich CZE aquifers based on hydrogeology are relatively short (years or less), DIC isotopes in the shallow, mostly anoxic, aquifer assemblage (HTU) were depleted in 14 C compared to a deeper, oxic, aquifer complex (HTL). Carbon isotopes and chemical changes in the deeper HTL wells could be explained by interaction of recharge waters equilibrated with post-bomb 14 C sources with carbonates. However, oxygen depletion and δ 13 C and 14 C values of DIC below those expected from the processes of carbonate equilibrium alone indicate considerably different biogeochemical evolution of waters in the upper aquifer assemblage (HTU wells). Changes in 14 C and 13 C in the upper aquifer complexes result from a number of biotic and abiotic processes, including oxidation of 14 C-depleted OM derived from recycled microbial carbon and sedimentary organic matter as well as water-rock interactions. The microbial pathways inferred from DIC isotope shifts and changes in water chemistry in the HTU wells were supported by comparison with in situ microbial community structure based on 16S rRNA analyses.Our findings demonstrate the large variation in the importance of biotic as well as abiotic controls on 13 C and 14 C of DIC in closely related aquifer assemblages. Further, they support the importance of subsurface-derived carbon sources like DIC for chemolithoautotrophic microorganisms as well as rock-derived organic matter for supporting heterotrophic groundwater microbial communities and indicate that even shallow aquifers have microbial communities that use a variety of subsurface-derived carbon sources.

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Section: Biogeochemical Processes Affecting Group 3 Wellsmentioning

confidence: 99%

Section: Han-plummer Plotmentioning

confidence: 99%

Section: Han-plummer Plotmentioning

confidence: 99%

Section: Han-plummer Plotmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon isotopes of dissolved inorganic carbon reflect utilization of different carbon sources by microbial communities in two limestone aquifer assemblages

Nowak

Schwab

Lazar

et al. 2017

Hydrol. Earth Syst. Sci.

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A review of CO₂ and associated carbon dynamics in headwater streams: A global perspective

Marx

Dušek

Jankovec

et al. 2017

Reviews of Geophysics

254

216

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Terrestrial carbon export via inland aquatic systems is a key process in the global carbon cycle. It includes loss of carbon to the atmosphere via outgassing from rivers, lakes, or reservoirs and carbon fixation in the water column as well as in sediments. This review focuses on headwater streams that are important because their stream biogeochemistry directly reflects carbon input from soils and groundwaters. Major drivers of carbon dioxide partial pressures (pCO2) in streams and mechanisms of terrestrial dissolved inorganic, organic and particulate organic carbon (DIC, DOC, and POC) influxes are summarized in this work. Our analysis indicates that the global river average pCO2 of 3100 ppmV is more often exceeded by contributions from small streams when compared to rivers with larger catchments (> 500 km2). Because of their large proportion in global river networks (> 96% of the total number of streams), headwaters contribute large—but still poorly quantified—amounts of CO2 to the atmosphere. Conservative estimates imply that globally 36% (i.e., 0.93 Pg C yr−1) of total CO2 outgassing from rivers and streams originate from headwaters. We also discuss challenges in determination of CO2 sources, concentrations, and fluxes. To overcome uncertainties of CO2 sources and its outgassing from headwater streams on the global scale, new investigations are needed that should include groundwater data. Such studies would also benefit from applications of integral CO2 outgassing isotope approaches and multiscale geophysical imaging techniques.

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Synecological response of spring benthic prokaryotes and macroinvertebrates to Paleozoic roof pendant‐derived calcium

et al. 2023

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Despite the ecological significance of desert springs, little is known about relationships between spring hydrogeochemistry and ecology, particularly over multiple trophic levels. Here, we surveyed microbial communities (bacteria and archaea) and benthic macroinvertebrate (BMI) communities in springs that recharge through granitoid bedrock in Owens Valley, CA, to determine whether subtle geochemical differences imparted by metamorphosed roof pendant weathering in the source area affect spring ecosystems. Relative to other springs, roof‐pendant‐recharged springs were characterized by elevated (1) Ca2+/Na+, Ca2+/Mg2+, and divalent/monovalent cation ratios, (2) relative abundance of taxa inferred to be benthic aerobes and prosthecate/stalked bacteria, and (3) abundance and diversity of shredder and collector gatherer BMIs. These BMI feeding groups graze on biofilm communities and stimulate bacterial degradation of particulate organic matter, consistent with extensive bacteria–BMI connections in co‐occurrence networks in these springs. Springs not impacted by roof pendants were instead enriched with taxa inferred to be anaerobes, chemolithotrophs, and low‐diversity BMI communities with poor bacteria–BMI network connectivity. We speculate that excess Ca2+ derived from roof pendant weathering plays a key role in biofilm formation on coarse granite substrates, with subsequent trophic interactions between benthic microbial biofilms and diverse BMI shredders/collector gatherers.

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A review of single-sample-based models and other approaches for radiocarbon dating of dissolved inorganic carbon in groundwater

Cited by 116 publications

References 84 publications

Carbon isotopes of dissolved inorganic carbon reflect utilization of different carbon sources by microbial communities in two limestone aquifer assemblages

Carbon isotopes of dissolved inorganic carbon reflect utilization of different carbon sources by microbial communities in two limestone aquifer assemblages

A review of CO₂ and associated carbon dynamics in headwater streams: A global perspective

Synecological response of spring benthic prokaryotes and macroinvertebrates to Paleozoic roof pendant‐derived calcium

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A review of single-sample-based models and other approaches for radiocarbon dating of dissolved inorganic carbon in groundwater

Cited by 116 publications

References 84 publications

Carbon isotopes of dissolved inorganic carbon reflect utilization of different carbon sources by microbial communities in two limestone aquifer assemblages

Carbon isotopes of dissolved inorganic carbon reflect utilization of different carbon sources by microbial communities in two limestone aquifer assemblages

A review of CO2 and associated carbon dynamics in headwater streams: A global perspective

Synecological response of spring benthic prokaryotes and macroinvertebrates to Paleozoic roof pendant‐derived calcium

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A review of CO₂ and associated carbon dynamics in headwater streams: A global perspective