Calcium Isotope Evidence for Secondary Carbonate Formation in the Upper Yellow River, Northeastern Tibetan Plateau

Опубликована: Янв. 1, 2025

Chemical weathering and secondary mineral formation, both of which involve Ca cycling, are intricately linked to the carbon cycle. However, impact these geochemical processes on particularly through carbonate formation in terrestrial environments, remains not fully understood. In this study, we analyzed isotopic compositions Upper Yellow River, northeastern Tibetan Plateau, investigate role chemical influencing cycles region. Inversion modeling reveals relative contributions different sources dissolved river water, with accounting for 41–95%. Although fractions from show linear correlations riverine δ44/40Ca values, detailed analysis that do imply a source control. Strong positive between Sr/Ca, Mg/Ca, water suggest predominantly regulates lake waters. Using Monte Carlo simulations, Rayleigh fractionation model best fits isotope factor 0.9997. The highest values (1.49‰ 1.76‰) attributed lakes. Meanwhile, formed soils, such as calcrete crusts dispersed particles, primarily influenced by rainfall, evaporation, evaporite dissolution, explains ~0.3‰ variation δ44/40Ca. Combining literature data, propose could be primary cause imbalance This study highlights influence cycle, its soil inorganic pool CO2 degassing

Язык: Английский

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Seasonally Dynamic Dissolved Carbon Cycling in a Large Hard Water Lake

Journal of Geophysical Research Biogeosciences, Год журнала: 2025, Номер 130(3)

Опубликована: Март 1, 2025

Abstract Inland waters play a crucial role in the global carbon cycle, with lakes integrating from various sources within their catchment addition to that fixed by local primary productivity. Isotopic measurements of pools can differentiate contributions these sources, natural abundance radiocarbon ( 14 C) particularly powerful tool due large range C characteristics among sources. Here, we present dissolved inorganic (DIC) and organic (DOC) monthly water column samplings over course year Lake Geneva, oligotrophic hard perialpine lake Western Europe. We find DIC is significantly C‐depleted relative atmosphere primarily dissolution carbonate rocks lake's catchment. Variability DI largely tied Rhône River inflow, where values were also found vary seasonally. DOC has signature similar DIC, reflecting fact much pool autochthonous. However, more was observed July increased river discharge snow glacier melt upper basin. These observations shed light on dynamics Geneva its alpine highlight importance preaged inputs largest

Язык: Английский

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Organic matter accumulation and carbon sequestration in the Paleocene-Eocene Thermal Maximum: Insights from the Kongdian Formation in Cangdong Sag, Bohai Bay Basin

Journal of Asian Earth Sciences, Год журнала: 2025, Номер unknown, С. 106606 - 106606

Опубликована: Апрель 1, 2025

Язык: Английский

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Calcium isotope evidence for secondary carbonate formation in the Upper Yellow River, Northeastern Tibetan Plateau

Global and Planetary Change, Год журнала: 2025, Номер unknown, С. 104881 - 104881

Опубликована: Май 1, 2025

Язык: Английский

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Closing the inland water carbon cycle

Science Advances, Год журнала: 2024, Номер 10(44)

Опубликована: Окт. 30, 2024

Inland water carbon dioxide emissions mirror the ocean’s uptake and are driven not only by ecosystem heterotrophy but also chemical equilibration calcification.

Язык: Английский

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Use of process-based coupled ecological-hydrodynamic models to support lake water ecosystem service protection planning at the regional scale

Journal of Contaminant Hydrology, Год журнала: 2024, Номер 268, С. 104469 - 104469

Опубликована: Ноя. 26, 2024

Язык: Английский

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