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Methane emissions - Astrophysics Data System

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Last Updated: 08 May 2022

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Contribution of periphytic biofilm of paddy soils to carbon dioxide fixation and methane emissions

Rice paddies are key contributors to human greenhouse gas emissions due to methane flux. We've thoroughly investigated the role of one particular microbial aggregate, periphytic biofilm, in carbon dioxide and CH4 leaks from paddies distributed across three climatic zones, as well as CO 2 fixation. In the rice paddies, we found that PB was responsible for 7. 9%-38. 5% of CH4 emissions and 7. 2%-12. 7% of CO 2 fixation. Our results demonstrate a strong foundation for the estimation and simulation of carbon fluxes in a new alternative to CH4 mitigation by manipulating PB growth, providing proof-of-concept evidence for the discrimination of surface microbial aggregates from soil microbes.

Source link: https://ui.adsabs.harvard.edu/abs/2022Innov...300192W/abstract


Development of Multiwell-Plate Methods Using Pure Cultures of Methanogens To Identify New Inhibitors for Suppressing Ruminant Methane Emissions

ABSTRACT Hydrogenotrophic methanogens typically require strictly anaerobic culturing conditions in glass tubes with overpressures of H 2 and CO 2 that are both time-consuming and expensive. To increase the throughput for screening chemical compound libraries, 96-well microtiter plate systems for the growth of a marine methanogen Methanococcus maripaludis strain S2 and the rumen methanogen Methanogenous Bac species AbM4 were created. Several bioactive compounds were identified by this screen, and MIC values were established for some of them against M. maripaludis and M. AbM4. IMPORTANCE Methane emissions from ruminants are a significant contributor to global greenhouse gas emissions, and new technologies are needed to reduce emissions in the agriculture technology sector. Multiple new methanogen growth inhibitors were discovered on this platform, showing the ability of this strategy to expedite the development of methanogen-specific inhibitors for combating ruminant methane emissions.

Source link: https://ui.adsabs.harvard.edu/abs/2017ApEnM..83E.396W/abstract


Methane emissions from US low production oil and natural gas well sites

Low production well sites in the United States account for about half of all O&G well site CH 4 emissions, as well as a production-normalized CH 4 loss rate of more than 10%, which is a factor of 6—12 times higher than the mean CH 4 loss rate of 1. 5% for all O&G well sites in the United States.

Source link: https://ui.adsabs.harvard.edu/abs/2022NatCo..13.2085O/abstract


Methane emissions and rumen metabolite concentrations in cattle fed two different silages

The Methane yield was much lower from animals fed RC compared to GS p = 0. 008. To determine which metabolites were more relevant to distinguish between diets and partial least squares regressions were used to determine which metabolites were more important to distinguish between diets and partial least squares regressions were used to determine which metabolites were more correlated with CH4 emissions variability. When included in the model, the CH4 variation is explained by diet and dry matter intake, according to the model's statistics. In addition, PLS was conducted within diet, revealing that the connection between metabolites and CH4 emissions can be modified by diet.

Source link: https://ui.adsabs.harvard.edu/abs/2022NatSR..12.5441B/abstract


Assessing methane emissions for northern peatlands in ORCHIDEE-PEAT revision 7020

The most notable natural source in the global methane market is wetlands, which cover all ecosystems that are waterlogged or inundated ground that are capable of methane production. Among them, northern peatlands that store significant amounts of soil organic carbon have been operating since the end of the last glaciation period as long-term sources of methane and are one of the most common methane sources among wetlands. To reduce confusion of quantifying methane flux in the global methane market, it is of utmost importance to understand the underlying mechanisms for methane production and fluxes in northern peatlands. In the ORCHIDEE-PEAT land surface model that includes an explicit representation of northern peatlands, a methane production and transport by plants, ebullition process and diffusion in soil, oxidation to CO 2, and CH 4 fluxes to the atmosphere, a methane model with methane production and transport by plants, is embedded.

Source link: https://ui.adsabs.harvard.edu/abs/2022GMD....15.2813S/abstract


Quantifying fossil fuel methane emissions using observations of atmospheric ethane and an uncertain emission ratio

We find that using an emission ratio estimator reduces bias toward a predetermined, potentially inaccurate emission ratio, and that uncertainty in this ratio is propagated into subsequent estimates of emissions. Methane and ethane measurements from high-frequency data from the UK Deriving Emissions network can be estimated by this method. Using the joint methane-ethane inverse scheme, we estimated annual mean UK methane emissions of about 0. 27 Tg yr 1 from fossil fuel sources and 2. 06 Tg yr 1 from non-fossil fuel sources during the period 2015-2019. In comparison to results from the methane-only inversion, uncertainties in UK fossil fuel emissions estimates have decreased by 15% and up to 35% on average and up to 35 percent.

Source link: https://ui.adsabs.harvard.edu/abs/2022ACP....22.3911R/abstract


Grazing enhances carbon cycling but reduces methane emission during peak growing season in the Siberian Pleistocene Park tundra site

However, experimental evidence to quantify the impact of herbivore introduction into Arctic permafrost ecosystems remains scant, with large-herbivore grazing shown to significantly change tundra soil and vegetation properties as well as carbon fluxes. We investigated rising-season CO 2 and CH 4 fluxes with flux chambers on a former wet tussock tundra inside Pleistocene Park, a landscape experiment in northeast Siberia with a 22-year history of grazing. Overall, both GPP and R eco were significantly higher at the grazed site, with notable differences in plots at each site. The grazed site's soil moisture and CH4 fluxes decreased over the course of the year, but the ungrazed site's continually flooded soils held CH 4 fluxes at much higher levels.

Source link: https://ui.adsabs.harvard.edu/abs/2022BGeo...19.1611F/abstract


Peat macropore networks - new insights into episodic and hotspot methane emission

The characterization of peat pore structure and connectivity using mixed network theory techniques will give conceptual insight into how the relationship between the microscale pore space properties and CH 4 emissions on a macroscopic scale is shaped. Through a pore network model simulation approach, the evolution of the pore space that is connected to the atmosphere can also be described. We also investigated the simulation results with measured water retention characteristics of the peat samples to simulate the water retention characteristics of the peat samples by using a por network modeling approach. The results showed significant differences in peat macropore structure and pore network connectivity between vertical soil layers. Both local and global network connectivity metrics, such as the network average clustering coefficient and closeness centrality, can also be used as proxies for determining the effectiveness of gas diffusion in air-filled pore networks, according to the network study. The pore network's geographical distribution and permanence of the pores may be represented in different network metrics in different ways. The hysteresis of peat water content between wetting and drying was discovered to influence the change in the amount of connected air-filled pore space in unsaturated peat. Consequently, the emergence of anaerobic pockets may occur in a reduced soil volume and methanogenesis may be slower when the peat is wetting than under drying conditions.

Source link: https://ui.adsabs.harvard.edu/abs/2022BGeo...19.1959K/abstract


Termite mounds mitigate half of termite methane emissions

To fill a long-standing knowledge gap, we offer a mechanistic glimpse of CH 4's turnover in termite mounds. We find that termite mounds oxidize, on average, half of the CH 4 produced by termites before release using field measurements. Moreover, we estimate undisturbed termite biomass using CH4 emissions.

Source link: https://ui.adsabs.harvard.edu/abs/2018PNAS..11513306N/abstract


Measurements of methane emissions at natural gas production sites in the United States

Well completion emissions are lower than previously expected, according to the reports; pneumatic controllers and equipment leaks are also higher than environmental Protection Agency national emission standards. Figures of total emissions are similar to the most recent EPA national inventory of methane emissions from natural gas production.

Source link: https://ui.adsabs.harvard.edu/abs/2013PNAS..11017768A/abstract

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions