Groundwater discharge as a driver of methane emissions from Arctic lakes

Olid, Carolina; Rodellas, Valentí; Rocher-Ros, Gerard; García-Orellana, Jordi; Diego-Feliu, Marc; Alorda-Kleinglass, Aaron; Bastviken, David; Karlsson, Jan

doi:10.1038/s41467-022-31219-1

Cited by 26 publications

(12 citation statements)

References 76 publications

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“…As a natural tracer of groundwater and a driver of CO 2 and CH 4 emission from coast and lake waters (Santos et al 2012, Olid et al 2022 Radon in SPout glacial lake which acted as CO 2 source was much larger than that of other glacial lakes (figure 2 suggesting the potential contribution from groundwater (with the 222 Radon of 2360 ± 555 Bq m −3 ) nearby SP glaciers. This phenomenon indicated groundwater input could alter GHG emissions from lake waters, which would be important in lake carbon budget as temperature rise is exacerbating groundwater inputs to lakes of the TP (Lei et al 2022).…”

Section: Glacial Lakes Of the Tp As Ch 4 Sources And Co 2 Sinksmentioning

confidence: 98%

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: Glacial Lakes Of the Tp As Ch 4 Sources And Co 2 Sinksmentioning

confidence: 98%

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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“…Nevertheless, lakes are highly heterogeneous across the globe (Guo et al, 2021), especially for those big lakes, such that regional lake simulation may introduce a high uncertainty. Furthermore, recent studies have found that groundwater discharge could be an important pathway as lateral CH 4 inputs to Arctic lakes that links CH 4 production in thawing permafrost to atmospheric emissions via lakes (Olid et al, 2022). Jammet et al (2015) also confirmed that spring is a crucial period for methane dynamics in sub-Arctic shallow lakes while large methane emissions were observed during the spring thaw.…”

Section: Uncertainty Analysis and Future Workmentioning

confidence: 67%

Methane emissions from Arctic landscapes during 2000–2015: an analysis with land and lake biogeochemistry models

Liu

Zhuang

2023

Biogeosciences

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Abstract. Wetlands and freshwater bodies (mainly lakes) are the largest natural sources of the greenhouse gas CH4 to the atmosphere. Great efforts have been made to quantify these source emissions and their uncertainties. Previous research suggests that there might be significant uncertainties coming from “double accounting” emissions from freshwater bodies and wetlands. Here we quantify the methane emissions from both land and freshwater bodies in the pan-Arctic with two process-based biogeochemistry models by minimizing the double accounting at the landscape scale. Two non-overlapping dynamic areal change datasets are used to drive the models. We estimate that the total methane emissions from the pan-Arctic are 36.46 ± 1.02 Tg CH4 yr−1 during 2000–2015, of which wetlands and freshwater bodies are 21.69 ± 0.59 Tg CH4 yr−1 and 14.76 ± 0.44 Tg CH4 yr−1, respectively. Our estimation narrows the difference between previous bottom-up (53.9 Tg CH4 yr−1) and top-down (29 Tg CH4 yr−1) estimates. Our correlation analysis shows that air temperature is the most important driver for methane emissions of inland water systems. Wetland emissions are also significantly affected by vapor pressure, while lake emissions are more influenced by precipitation and landscape areal changes. Sensitivity tests indicate that pan-Arctic lake CH4 emissions were highly influenced by air temperature but less by lake sediment carbon increase.

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“…Furthermore, recent studies have found that groundwater discharge could be an important pathway 345 as lateral CH4 inputs to Arctic lakes that links CH4 production in thawing permafrost to atmospheric emissions via lakes (Olid et al, 2022). Jammet et al (2015) also confirmed that spring is a crucial period for methane dynamics in subarctic shallow lakes while large methane emissions were observed during the spring thaw.…”

Section: Uncertainty Analysis and Future Workmentioning

confidence: 69%

Methane emissions from Arctic landscapes during 2000–2015: An analysis with land and lake biogeochemistry models

Liu

Zhuang²

2022

Preprint

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Abstract. Wetlands and freshwater bodies (mainly lakes) are the largest natural source of greenhouse gas CH4 to the atmosphere. Great efforts have been made to quantify these source emissions and their uncertainties. Previous research suggests that there might be significant uncertainties coming from “double accounting” emissions from freshwater bodies and wetlands. Here we quantify the methane emissions from both land and freshwater bodies in the pan-Arctic with two process-based biogeochemistry models by minimizing the double accounting at the landscape scale. Two non-overlapping dynamic areal change datasets are used to drive the models. We estimate that the total methane emissions from pan-Arctic are 35.81 Tg CH4 yr−1 during 2000–2015, of which wetlands and freshwater bodies are 21.38 CH4 Tg yr−1 and 14.45 Tg CH4 yr−1, respectively. The emissions are significantly affected by humidity and vapor pressure, followed by temperature and landscape areal changes. Emissions from wetlands are more sensitive to landscape areal changes than from freshwater bodies while the latter emissions are more influenced by temperature than precipitation. Our sensitivity analysis indicates the pan-Arctic CH4 emissions from freshwater bodies were highly influenced by temperature, but less by lake sediment carbon content from permafrost thaw.

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Groundwater discharge as a driver of methane emissions from Arctic lakes

Cited by 26 publications

References 76 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

Methane emissions from Arctic landscapes during 2000–2015: an analysis with land and lake biogeochemistry models

Methane emissions from Arctic landscapes during 2000–2015: An analysis with land and lake biogeochemistry models

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Groundwater discharge as a driver of methane emissions from Arctic lakes

Cited by 26 publications

References 76 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

Methane emissions from Arctic landscapes during 2000–2015: an analysis with land and lake biogeochemistry models

Methane emissions from Arctic landscapes during 2000–2015: An analysis with land and lake biogeochemistry models

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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