Transport and transformation of dissolved inorganic carbon in a subtropical groundwater‑fed reservoir, south China

Li, Jianhong; Pu, Junbing; Tao, Zhang

doi:10.1016/j.watres.2021.117905

Cited by 23 publications

(8 citation statements)

References 49 publications

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“…DOC and DIC concentrations were analyzed with a TOC-500A analyzer (Shimadzu Corp, Kyoto, Japan). The DIC carbon isotopes were analyzed with a MAT-253 mass spectrometer coupled with a Gas Bench II automated device (Li et al 2021a). The DOC isotope composition was measured by ISO TOC CUBE-ISOPRIME100 (Elementar).…”

Section: Sample Collection and Measurementsmentioning

confidence: 99%

Isotopic composition and emission characteristics of CO₂ and CH₄ in glacial lakes of the Tibetan Plateau

Yan

et al. 2023

Environ. Res. Lett.

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Carbon dioxide (CO2) and methane (CH4) emissions from freshwater ecosystems are predicted to increase under climate warming. However, freshwater ecosystems in glacierized regions differ critically from those in non-glacierized regions. The potential emissions of CO2 and CH4 from glacierized environments in the Tibetan Plateau (TP) were only recently recognized. Here, the first direct measurement of CO2 and CH4 emission fluxes and isotopic composition during spring of 2022 in 13 glacial lakes of the TP revealed that glacial lakes were the previously overlooked CO2 sinks due to chemical weathering in glacierized regions. The daily average CO2 flux was -5.1±4.4 mmol m-1 d-1, and the CO2 consumption could reach 38.9 Gg C-CO2 yr-1 by all glacial lakes in the TP. This consumption might be larger during summer when glaciers experience intensive melting, highlighting the importance of CO2 uptake by glacial lake on the global carbon cycle. However, the studied glacial lakes were CH4 sources with total emission flux ranging from 4.4±3.3 to 4082.5±795.6 µmol m-2 day-1. The large CH4 range was attributed to ebullition found in three of the glacial lakes. The low dissolved organic carbon concentrations and CH4 oxidation might be responsible for low CH4 diffusive fluxes of glacial lakes without ebullition. In addition, groundwater input could alter CO2 and CH4 emissions from glacial lakes. CH4 in glacial lakes probably had a thermogenic source; whereas CO2 was influenced mainly by atmospheric input, as well as organic matter remineralization and CH4 oxidation. Overall, glacial lakes in the TP play an important role in global carbon cycle and budget, and more detailed isotopic and microbial studies are needed to constrain the contributions of different pathways to CO2 and CH4 production, consumption and emissions.

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Section: Sample Collection and Measurementsmentioning

confidence: 99%

Isotopic composition and emission characteristics of CO₂ and CH₄ in glacial lakes of the Tibetan Plateau

Yan

et al. 2023

Environ. Res. Lett.

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“…Isotopes of DIC (δ 13 C DIC ) were determined using Thermo MAT253 plus (Thermo Fisher Scientific, Germany) with a Gas Bench II automated device (Thermo Fisher Scientific, Germany) (Su et al., 2019). The carbon isotope ratios of DIC were expressed in delta notation (δ 13 C) relative to Vienna PDB, and the standard deviations based on replicate measurements for δ 13 C were ∼0.05‰ (Li, Pu, & Zhang, 2022).…”

Section: Methodsmentioning

confidence: 99%

“…The variation in riverine recharge will lead to an enrichment or dilution effect on DIC and may further affect the source proportion of DIC (Gao et al., 2020; Liu et al., 2016; Raymond & Hamilton, 2018; Song et al., 2020). Among these influential factors, the effect of damming and lake recharge on DIC has aroused widespread concern (Li, Pu, & Zhang, 2022; Wang et al., 2020). As over 16 million dams have been operating globally and many new dams will be built, biogeochemical processes of riverine DIC have significantly changed (Maavara et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Changes in Dissolved Inorganic Carbon Across Yangtze River Regulated by Dam and River‐Lake Exchange

Zhao,

Wang,

et al. 2023

Global Biogeochemical Cycles

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The boom in dam construction and continuous river‐lake exchange has had a profound impact on the transmission and transformation of riverine dissolved inorganic carbon (DIC). An in‐depth understanding of the change mechanisms of DIC concentrations and sources driven by dam operation and lake recharge is crucial for regulating greenhouse gas emissions and evaluating the impact of DIC on the global carbon cycle. This study investigated dam‐ and lakes‐driven DIC via the concentration and δ13C of DIC, combined with anions, cations, δD and δ18O in the main stream of the Yangtze River. DIC showed a decreasing trend from upper reach (2,262.31 ± 113.69 μmol kg−1) to lower reach (1,771.61 ± 89.36 μmol kg−1). Carbonate dissolution proportion (from 36.45% to 28.44%) and atmospheric CO2 proportion (from 37.51% to 22.94%) of DIC decreased from upper reach to lower reach, whereas soil CO2 proportion of DIC (from 26.01% to 48.63%) increased. The control of dam operation on DIC biogeochemical process was revealed from different time scales. From the perspective of short‐term seasonal changes (from 2020 to 2021), the mineralization of organic matter in the dry season strengthened CO2 degassing and calcite precipitation, reducing the DIC and increasing the proportion of soil CO2. Meanwhile, longer periods of runoff retention provided sufficient time for water–rock reactions in the wet season and increased the DIC and carbonate dissolution source in the reservoir area. On a long‐term scale (from 2009 to 2021), a decrease in pH driven by sediment mineralization contributed to an annual increase in DIC in the reservoir. The flow of lakes mixed into the mainstream was revealed by the enrichment of δ18O, and river‐communicating recharge decreased the DIC and carbonate dissolution source. We show that dam operation and lake inflow change DIC concentrations and sources and therefore need to be considered in the transmission and transformation processes of DIC in the river‐ocean continuum.

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“…Previous studies have illustrated the sources and cycling of DIC within diverse lakes, including freshwater lakes (Dempsey et al, 2020;Raymond et al, 2013), saline lakes (Brady et al, 2013;Li et al, 2021), and reservoirs (Li et al, 2018;Li, Pu, & Zhang, 2022). The sources and cycling of DIC within glacier-fed lakes are significantly different from the other water bodies.…”

Section: Introductionmentioning

confidence: 99%

“…Dissolved inorganic carbon (DIC) in lakes consists of dissolved CO 2 , carbonates (CO 3 2− ), and bicarbonate (HCO 3 − ), with the proportions generally controlled by pH (Abril et al., 2015). Previous studies have illustrated the sources and cycling of DIC within diverse lakes, including freshwater lakes (Dempsey et al., 2020; Raymond et al., 2013), saline lakes (Brady et al., 2013; Li et al., 2021), and reservoirs (Li et al., 2018; Li, Pu, & Zhang, 2022). The sources and cycling of DIC within glacier‐fed lakes are significantly different from the other water bodies.…”

Section: Introductionmentioning

confidence: 99%

Glacier‐Fed Lakes Are Significant Sinks of Carbon Dioxide in the Southeastern Tibetan Plateau

Zhu,

Kuang,

Song

et al. 2024

JGR Biogeosciences

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Dissolved inorganic carbon (DIC) sources, transportation, and transition in inland water bodies have been intensively studied due to their important role in the global carbon cycle. While glacier‐fed lakes play a crucial role in global carbon cycling, related studies are limited. In this study, we investigated the spatiotemporal variability of DIC in the maritime glacier‐fed lakes of the southeastern Tibetan Plateau, identifying the carbon sources and potential controlling factors of DIC pathways The results revealed significant temporal variations in DIC and δ13C‐DIC, with averages of 7.29 ± 0.45 mg C L−1 and –8.6 ± 0.2‰ in summer, and 3.40 ± 0.54 mg C L−1 and –7.4 ± 0.6‰ in winter, respectively. Temporal variations in DIC and δ13C‐DIC were mainly controlled by carbonates weathering and silicate weathering processes. The chemical weathering reactions facilitate the consumption of dissolved CO2. Undersaturated pCO2 (120.02 ± 29.18 μatm) relative to atmospheric equilibrium suggests considerable capacity for CO2 uptake within glacier‐fed lakes system. We estimated that the maritime glacier‐fed lakes in the southeastern Tibetan Plateau absorb a total of 9.6 ± 2.7 × 10−3 Tg C‐CO2 yr−1, highlighting their significant contribution to the global carbon budget. The distinctive landscape of the glacier‐fed system and the vulnerable weathering environment result in seasonal and spatial variations of DIC concentration and δ13C‐DIC values, as well as the chemical weathering‐induced CO2 sink in glacier regions. Given the accelerated glacier retreat observed in this area, further studies on the temporal variability of DIC in the water column are urgently needed to identify the mechanisms driving the biogeochemical reactions inside glacier‐fed lake. Our study highlights the unrecognized role of maritime glacier‐fed lakes as CO2 sinks and emphasizes their significance in regional carbon budgets.

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Transport and transformation of dissolved inorganic carbon in a subtropical groundwater‑fed reservoir, south China

Cited by 23 publications

References 49 publications

Isotopic composition and emission characteristics of CO₂ and CH₄ in glacial lakes of the Tibetan Plateau

Isotopic composition and emission characteristics of CO₂ and CH₄ in glacial lakes of the Tibetan Plateau

Changes in Dissolved Inorganic Carbon Across Yangtze River Regulated by Dam and River‐Lake Exchange

Glacier‐Fed Lakes Are Significant Sinks of Carbon Dioxide in the Southeastern Tibetan Plateau

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Transport and transformation of dissolved inorganic carbon in a subtropical groundwater‑fed reservoir, south China

Cited by 23 publications

References 49 publications

Isotopic composition and emission characteristics of CO2 and CH4 in glacial lakes of the Tibetan Plateau

Isotopic composition and emission characteristics of CO2 and CH4 in glacial lakes of the Tibetan Plateau

Changes in Dissolved Inorganic Carbon Across Yangtze River Regulated by Dam and River‐Lake Exchange

Glacier‐Fed Lakes Are Significant Sinks of Carbon Dioxide in the Southeastern Tibetan Plateau

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Isotopic composition and emission characteristics of CO₂ and CH₄ in glacial lakes of the Tibetan Plateau

Isotopic composition and emission characteristics of CO₂ and CH₄ in glacial lakes of the Tibetan Plateau