Carbon isotope fractionation between dissolved bicarbonate and gaseous carbon dioxide

Mook, W.G.; Bommerson, J.C.; Staverman, W.H.

doi:10.1016/0012-821x(74)90078-8

Cited by 1,516 publications

(885 citation statements)

References 11 publications

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“…increased bicarbonate concentration) drives DIC 13 C enrichment through isotopic equilibrium exchange with CO 2 (ca. 8‰ at 25 C in the HCO À 3 ÀCO 2 system; Mook et al, 1974). This interpretation and our results are consistent with mechanistic models of the isotopic response of DIC during evaporation (Abongwa and Atekwana, 2013;Dreybrodt and Deininger, 2014).…”

Section: Evaporation Experimentssupporting

confidence: 90%

Evaporation induced 18O and 13C enrichment in lake systems: A global perspective on hydrologic balance effects

Horton

Defliese

Tripati

et al. 2016

Quaternary Science Reviews

138

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a b s t r a c tGrowing pressure on sustainable water resource allocation in the context of global development and rapid environmental change demands rigorous knowledge of how regional water cycles change through time. One of the most attractive and widely utilized approaches for gaining this knowledge is the analysis of lake carbonate stable isotopic compositions. However, endogenic carbonate archives are sensitive to a variety of natural processes and conditions leaving isotopic datasets largely underdetermined. As a consequence, isotopic researchers are often required to assume values for multiple parameters, including temperature of carbonate formation or lake water d 18 O, in order to interpret changes in hydrologic conditions. Here, we review and analyze a global compilation of 57 lacustrine dual carbon and oxygen stable isotope records with a topical focus on the effects of shifting hydrologic balance on endogenic carbonate isotopic compositions.Through integration of multiple large datasets we show that lake carbonate d 18 O values and the lake waters from which they are derived are often shifted by >þ10‰ relative to source waters discharging into the lake. The global pattern of d 18 O and d 13 C covariation observed in >70% of the records studied and in several evaporation experiments demonstrates that isotopic fractionations associated with lake water evaporation cause the heavy carbon and oxygen isotope enrichments observed in most lakes and lake carbonate records. Modeled endogenic calcite compositions in isotopic equilibrium with lake source waters further demonstrate that evaporation effects can be extreme even in lake records where d 18 O and d 13 C covariation is absent. Aridisol pedogenic carbonates show similar isotopic responses to evaporation, and the relevance of evaporative modification to paleoclimatic and paleotopographic research using endogenic carbonate proxies are discussed.Recent advances in stable isotope research techniques present unprecedented opportunities to overcome the underdetermined nature of stable isotopic data through integration of multiple isotopic proxies, including dual element 13 C-excess values and clumped isotope temperature estimates. We demonstrate the utility of applying these multi-proxy approaches to the interpretation of paleohydroclimatic conditions in ancient lake systems. Understanding past, present, and future hydroclimatic systems is a global imperative. Significant progress should be expected as these modern research techniques become more widely applied and integrated with traditional stable isotopic proxies.

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Section: Evaporation Experimentssupporting

confidence: 90%

Evaporation induced 18O and 13C enrichment in lake systems: A global perspective on hydrologic balance effects

Horton

Defliese

Tripati

et al. 2016

Quaternary Science Reviews

138

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“…The total fractionation between the metabolic CO 2 and aragonite shells is 12.7‰, 10‰ from the fractionation between the metabolic CO 2 and HCO 3  pool from which the shell is deposited (Mook et al 1974;Zhang et al 1995) and 2.7‰ from that between aragonite and bicarbonate pool (Rubinson and Clayton 1969). In our study, the average offset between the aragonite shells and soft bodies is around 14.0‰, which is close to the total isotopic fractionations between the metabolic CO 2 and aragonite shells, supporting a significant fractionation between the metabolic CO 2 and HCO 3  pool that cannot be ignored during estimation of the proportions of the shell carbon with various origins.…”

Section: Discussionmentioning

confidence: 99%

Radiocarbon and Stable Carbon Isotope Analyses of Land Snails from the Chinese Loess Plateau: Environmental and Chronological Implications

Han

et al. 2010

Radiocarbon

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ABSTRACT. Paired radiocarbon and stable carbon analyses have been carried out on aragonite shells and organic soft bodies of snails from the Chinese Loess Plateau in order to explore the possibility of using these kinds of samples as environmental and chronological indicators. Results show that the soft bodies exhibit 14 C concentrations similar to those of plant leaves, indicating that carbon in the soft bodies is fixed from organic diets. The aragonite shells are depleted in 14 C compared to the soft bodies due to ingestion of 14 C-depleted carbonate. This depletion shows a consistent pattern across the Chinese Loess Plateau, implying a good potential for the snail shells to be applicable for 14 C dating with a simple correction. The  13 C values measured for aragonite shells display a linear relationship with those obtained for the soft bodies with a constant offset. In addition, the carbon derived from organic diets accounts for more than 70% of the total shell carbon. This fact suggests that stable carbon isotope composition of aragonite shells mainly reflects that of organic diet, and could be used as a reliable indicator of paleodiet in the Chinese Loess Plateau.

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“…Measurements were performed in duplicate on each triplicate sub-sample. The d 13 C of carbon dioxide was calculated from d 13 C-DIC with the in situ temperature according to Mook et al 68 For isotopic analysis of particulate organic carbon, replicate (n ¼ 3) sediment horizons were dried, homogenized and combined before removal of inorganic carbon via fuming with hydrochloric acid and analysis with an elemental analyser coupled to an IRMS. The stable carbon isotopic composition of apolar derivatives of intact polar lipids were analysed with a ThermoFinnigan Trace GC coupled to a ThermoFinnigan Delta-plus XP IRMS via GC-combustion interface III to a HP Series GC 69 .…”

Section: (Hplc)mentioning

confidence: 99%

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

et al. 2015

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The role of anaerobic oxidation of methane (AOM) in wetlands, the largest natural source of atmospheric methane, is poorly constrained. Here we report rates of microbially mediated AOM (average rate ¼ 20 nmol cm À 3 per day) in three freshwater wetlands that span multiple biogeographical provinces. The observed AOM rates rival those in marine environments. Most AOM activity may have been coupled to sulphate reduction, but other electron acceptors remain feasible. Lipid biomarkers typically associated with anaerobic methane-oxidizing archaea were more enriched in 13 C than those characteristic of marine systems, potentially due to distinct microbial metabolic pathways or dilution with heterotrophic isotope signals. On the basis of this extensive data set, AOM in freshwater wetlands may consume 200 Tg methane per year, reducing their potential methane emissions by over 50%. These findings challenge precepts surrounding wetland carbon cycling and demonstrate the environmental relevance of an anaerobic methane sink in ecosystems traditionally considered strong methane sources.

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Carbon isotope fractionation between dissolved bicarbonate and gaseous carbon dioxide

Cited by 1,516 publications

References 11 publications

Evaporation induced 18O and 13C enrichment in lake systems: A global perspective on hydrologic balance effects

Evaporation induced 18O and 13C enrichment in lake systems: A global perspective on hydrologic balance effects

Radiocarbon and Stable Carbon Isotope Analyses of Land Snails from the Chinese Loess Plateau: Environmental and Chronological Implications

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

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