Reservoir CO2 and CH4 emissions and their climate impact over the period 1900–2060

Soued, Cynthia; Harrison, John; Mercier-Blais, Sara; Prairie, Yves T.

doi:10.1038/s41561-022-01004-2

Cited by 41 publications

(9 citation statements)

References 33 publications

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“…Degradation of organic carbon in anaerobic environments leads to the production of two major GHGs, CO 2 and CH 4 , collectively contributing to the majority of anthropogenic warming. , Due to its high GWP and short atmospheric lifetime, CH 4 exerts an outsized impact on the climate, particularly in the near and medium terms. In this study, we demonstrated the ability of BC to prevent microbial CH 4 production and determined the capacity of a wood biochar (0.3 mmol of CH 4 /g) to do so.…”

Section: Resultsmentioning

confidence: 99%

Pyrogenic Black Carbon Suppresses Microbial Methane Production by Serving as a Terminal Electron Acceptor

Xin,

Li,

Choi

et al. 2023

Environ. Sci. Technol.

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Methane (CH 4 ) is the second most important greenhouse gas, 27 times as potent as CO 2 and responsible for >30% of the current anthropogenic warming. Globally, more than half of CH 4 is produced microbially through methanogenesis. Pyrogenic black carbon possesses a considerable electron storage capacity (ESC) and can be an electron donor or acceptor for abiotic and microbial redox transformation. Using wood-derived biochar as a model black carbon, we demonstrated that air-oxidized black carbon served as an electron acceptor to support anaerobic oxidation of organic substrates, thereby suppressing CH 4 production. Black carbon-respiring bacteria were immediately active and outcompeted methanogens. Significant CH 4 did not form until the bioavailable electron-accepting capacity of the biochar was exhausted. An experiment with labeled acetate ( 13 CH 3 COO – ) yielded 1:1 13 CH 4 and 12 CO 2 without biochar and predominantly 13 CO 2 with biochar, indicating that biochar enabled anaerobic acetate oxidation at the expense of methanogenesis. Methanogens were enriched following acetate fermentation but only in the absence of biochar. The electron balance shows that approximately half (∼2.4 mmol/g) of biochar’s ESC was utilized by the culture, corresponding to the portion of the ESC > +0.173 V (vs SHE). These results provide a mechanistic basis for quantifying the climate impact of black carbon and developing ESC-based applications to reduce CH 4 emissions from biogenic sources.

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Section: Resultsmentioning

confidence: 99%

Pyrogenic Black Carbon Suppresses Microbial Methane Production by Serving as a Terminal Electron Acceptor

Xin,

Li,

Choi

et al. 2023

Environ. Sci. Technol.

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“…However, additional research and development of new methods are needed to connect local, regional, and continental scales for a robust planning of water and energy systems (34). Similarly, greenhouse gas emissions from reservoirs (30,(45)(46)(47) are a deterrent for hydropower capacity expansion, particularly in tropical areas where life-cycle emissions associated with new dams might be comparable to those of fossil fuel power sources (48,49). Accounting for this factor will likely further promote the expansion of wind, solar, and other carbon-neutral technologies.…”

Section: Discussionmentioning

confidence: 99%

Declining cost of renewables and climate change curb the need for African hydropower expansion

Carlino

Wildemeersch

Chawanda

et al. 2023

Science

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Across continental Africa, more than 300 new hydropower projects are under consideration to meet the future energy demand that is expected based on the growing population and increasing energy access. Yet large uncertainties associated with hydroclimatic and socioeconomic changes challenge hydropower planning. In this work, we show that only 40 to 68% of the candidate hydropower capacity in Africa is economically attractive. By analyzing the African energy systems’ development from 2020 to 2050 for different scenarios of energy demand, land-use change, and climate impacts on water availability, we find that wind and solar outcompete hydropower by 2030. An additional 1.8 to 4% increase in annual continental investment ensures reliability against future hydroclimatic variability. However, cooperation between countries is needed to overcome the divergent spatial distribution of investment costs and potential energy deficits.

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“…Methane (CH 4 ) is a potent greenhouse gas (GHG) with a 20-year global warming potential of ∼86 times that of carbon dioxide (CO 2 ), the atmospheric concentrations of which have raced past the nearly triple pre-industrial level contributing about 20% of the radiative climate forcing for all GHGs . Methane oxidation microbes are essential in reducing emissions of the GHG into the atmosphere, which can oxidize 50–80% of biogenic CH 4 to CO 2 with a suite of electron acceptors .…”

Section: Introductionmentioning

confidence: 99%

Microbial Niche Differentiation during Nitrite-Dependent Anaerobic Methane Oxidation

Nie

Xie

Tan

et al. 2023

Environ. Sci. Technol.

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Nitrite-dependent anaerobic methane oxidation (n-DAMO) has been demonstrated to play important roles in the global methane and nitrogen cycle. However, despite diverse n-DAMO bacteria widely detected in environments, little is known about their physiology for microbial niche differentiation. Here, we show the microbial niche differentiation of n-DAMO bacteria through long-term reactor operations combining genome-centered omics and kinetic analysis. With the same inoculum dominated by both species "Candidatus Methylomirabilis oxyfera" and "Candidatus Methylomirabilis sinica", n-DAMO bacterial population was shifted to "Ca. M. oxyfera" in a reactor fed with low-strength nitrite, but shifted to "Ca. M. sinica" with high-strength nitrite. Metatranscriptomic analysis showed that "Ca. M. oxyfera" harbored more complete function in cell chemotaxis, flagellar assembly, and two-component system for better uptake of nitrite, while "Ca. M. sinica" had a more active ion transport and stress response system, and more redundant function in nitrite reduction to mitigate nitrite inhibition. Importantly, the half-saturation constant of nitrite (0.057 mM vs 0.334 mM NO 2 − ) and inhibition thresholds (0.932 mM vs 2.450 mM NO 2 − ) for "Ca. M. oxyfera" vs "Ca. M. sinica", respectively, were highly consistent with genomic results. Integrating these findings demonstrated biochemical characteristics, especially the kinetics of nitrite affinity and inhibition determine niche differentiation of n-DAMO bacteria.

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Reservoir CO2 and CH4 emissions and their climate impact over the period 1900–2060

Cited by 41 publications

References 33 publications

Pyrogenic Black Carbon Suppresses Microbial Methane Production by Serving as a Terminal Electron Acceptor

Pyrogenic Black Carbon Suppresses Microbial Methane Production by Serving as a Terminal Electron Acceptor

Declining cost of renewables and climate change curb the need for African hydropower expansion

Microbial Niche Differentiation during Nitrite-Dependent Anaerobic Methane Oxidation

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