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Methane Emissions - DOAJ

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Last Updated: 08 June 2022

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Satellite Constraints on the Latitudinal Distribution and Temperature Sensitivity of Wetland Methane Emissions

"Abstract Wetland methane emissions account for about one-third of the global CH4 source, according to a researcher. The global CH4-u2010 climate feedback variables are largely determined by latitudinal distribution and climate sensitivity of wetland CH4 fluxes. Here, we use satellite-based top-u2010down CH4 flux estimates to test and refine 42 bottom-u2010up estimates of wetland emissions that use a variety of hypothesized wetland extents and process controls. Our comparison of baseline inverse estimations of cross-u2010 correlations and spatial uncertainty found in top-u2010inverse estimates is based on satellite observations and the atmospheric transport model, which means only the results from satellite observations and the atmospheric transportation model are included as a constraint. We present a satellite-u2010constrained wetland CH4 ensemble product developed from building the highest-u2010performance bottom-u2010up models, which calculates global wetland CH4 emissions of 148 Tg CH4 per capita yr'u22121. Tropical wetland emissions contribute 72% to the global wetland total, according to Wetland's report.

Source link: https://doi.org/10.1029/2021AV000408


Unexpected Methane Emissions From Old Small Fishing Vessels in China

On average, CH4 per 1 kg fuel consumption is on average 5. 2 g CH4 per 1 kg, approaching EFCH4 of LNG-fueled ships and being at least six times EFCH4 of other types of diesel-fueled ships. According to our estimates, CH4 emissions from OSFVs in China amount to 570,240 t per year, which is equivalent to the total CH4 emissions from all LNG-fueled ships worldwide.

Source link: https://doi.org/10.3389/fenvs.2022.907868


Non-Fossil Methane Emissions Mitigation From Agricultural Sector and Its Impact on Sustainable Development Goals

"Methane is also 28 times more potent greenhouse gas than CO2. " This report evaluates the impact of steps for reducing methane pollution from the agricultural sector on the achievement of all the 17 United Nations Sustainable Development Goals. The findings were in broad accord with the literature aimed at determining the connection between SDGs and climate change-targeted climate change. Since agriculture is the main occupation and source of income in emerging countries, it can be even predicted that methane mitigation efforts in developing countries will play a bigger part in reaching SDGs.

Source link: https://doi.org/10.3389/fceng.2022.838265


Study of Organic Fertilizers and Rice Varieties on Rice Production and Methane Emissions in Nutrient-Poor Irrigated Rice Fields

"The issue of rice farming in Indonesia is the increased prevalence of nutrient-poor land due to the lack of organic matter and continuously irrigated rice fields, causing the production of greenhouse gas emissions, such as methane gas" to increase. The aim of the study is to determine the effects of organic fertilizers and rice varieties on rice yield, methane emissions, and the possibility of farming in nutrient-poor rice fields. The results revealed that Inpari 20's productivity was considerably higher than that of Inpari 30 and Ciherang. Inpari 20, Inpari 30, and Ciherang had the highest yields of Harvest Dry Grain to Milled Dry Grain. "In comparison to Inpari 30 and Ciherang varieties, the Inpari 20 variety of rice straw compost has a broad market viability in nutrient-poor paddy fields," the farmer reports.

Source link: https://doi.org/10.3390/su14105919


A Study of a Miniature TDLAS System Onboard Two Unmanned Aircraft to Independently Quantify Methane Emissions from Oil and Gas Production Assets and Other Industrial Emitters

"Deployed on both fixed-wing and multi-rotor unmanned aerial vehicles, as well as multi-rotor unmanned aerial vehicles, a miniature tunable diode laser absorption spectroscopy sensor has accurately quantified methane emissions from oil and gas installations around the world since 2017. " Both fixed-wing and multi-rotor are available; two independent deployment methods for quantifying methane emissions using the in-house TDLAS sensor are included: fixed-wing and multi-rotor. Two flight styles were developed for the quadcopter rotary drone surveys: perimeter polygons and downwind flux planes. When flying downwind flux planes, the difference was less than 28% and average error of 16. 2%, with absolute error less than 36% and average deviation of 16. 2%. This paper demonstrates the use of ultra-sensitive miniature spectrometers for industrial methane measurement at a plant level for several potential uses.

Source link: https://doi.org/10.3390/atmos13050804


Measurement Duration but Not Distance, Angle, and Neighbour-Proximity Affects Precision in Enteric Methane Emissions when Using the Laser Methane Detector Technique in Lactating Dairy Cows

"The laser methane detector, which is a unique hand-held open path laser measuring system, is a novel hand-held open path laser measuring unit. Methane measurements taken from a distance of 3 meters to those taken at a distance of 45 meters have no difference in enteric methane measurements taken from a distance of 2 meters; there is no difference between the measurements taken at a distance of 3 meters to 45; that the presence of an immediate animal had no effect on the results; and that measurements lasting longer than those taken for a shorter time; and that measurements taken at a distance of 30 to 45u00b0 were the same as the study has found no difference in the study has found no difference between 90 u00b0; there were taken at a distance; there were more precise than those taken from 90 m; there were taken from 90u00b0; there were taken at 45 0; there were taken at a distance; the measurement angle was not effect on methane a 240 m than those taken in a shorter duration;.

Source link: https://doi.org/10.3390/ani12101295


Challenges Regionalizing Methane Emissions Using Aquatic Environments in the Amazon Basin as Examples

"The big seasonal variation in flooded areas and habitats, the wide variety of aquatic ecosystems throughout the Amazon basin, as well as the variability in methane fluxes in time and space are the key challenges to regionalization of methane fluxes in the Amazon basin. " "We review the adequacy of sampling and of field methods plus atmospheric measurements in Amazon aquatic environments, as applied to the Amazon basin, summarize published fluxes and regional estimates using bottom-up and top-down methods, and explore current knowledge of biogeochemical and physical processes in Amazon aquatic environments and their incorporation into mechanistic and statistical models," we discuss.

Source link: https://doi.org/10.3389/fenvs.2022.866082


Gaps in network infrastructure limit our understanding of biogenic methane emissions for the United States

"There are widespread doubts regarding atmospheric CH 4's global budget, but natural emissions are expected to be of a similar magnitude to anthropogenic emissions. " To analyze CH 4 flux from biogenic sources in the United States of America, a multi-scale CH 4 observation network focusing on CH 4 flux rates, processes, and scaling methods is required. To assess CH 4 flux from biogenic sources in the United States of America, a multi-scale CH 4 observation network focusing on CH 4 flux rates, processes, and scaling methods is required. We are focusing on eddy covariance flux towers because they are so vital for a bottom-up framework that bridges the gap between point-based chamber measurements and airborne or satellite platforms that support policy decisions and global climate agreements. We analyzed dissimilarity within each cluster of research sites with active CH 4 towers to find deficiencies in current infrastructure that limit our ability to limit the contribution of U. S. biogenic CH 4 emissions to the global budget.

Source link: https://doi.org/10.5194/bg-19-2507-2022


Extreme Hydrological Events and Reservoir Methane Emissions

Between October 2010 and April 2012, "Floating chamber measurements of CH4 emissions from Cotter Reservoir were carried out on five occasions. " During the second summer of the study, the floods warmed the hypolimnion of this normally monomictic reservoir by u223c8. u00b0C during the first summer and by u223c3u00b0C. Following the first floods, which occurred during spring and summer 2010-u20132011, the mean reservoir CH4 concentration increased to 99 mg-CH4 mu22121, a hundred times more than emissions near the dam wall. Both thermal change of sediment methanogenesis by a factor of 2u20137 and the availability of fresh organic matter from the catchment can be attributed to both thermal enhancement of sediment methanogenesis by a factor of 2 --u20137.

Source link: https://doi.org/10.3389/fenvs.2022.893180


Eating Time as a Genetic Indicator of Methane Emissions and Feed Efficiency in Australian Maternal Composite Sheep

"The aim of this research was to determine feeding behaviour traits as genetic markers for ME and RFI in Australian Maternal Composite ewes using data obtained from an automated feed intake center. " The amount of time spent eating per day and per visit, the daily number of events, event feed intake, and eating rate were among the feeding behaviour traits tested were the number of meals per day and per visit. The response to choosing was determined for ME and RFI with direct selection models and indirect models with ETE as an indicator characteristic, as this behaviour trait was a promising indicator based on heritability and genetic correlations. Selecting for more ETE also increases feed quality, but results in more methane per day and per kg dry matter intake. Based on our findings, ETE could be regarded as an indicator of ME and RFI under an index system that promotes simultaneous selection for emission and feed efficiency improvements.

Source link: https://doi.org/10.3389/fgene.2022.883520

* 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