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Methane Emissions - Wiley Online Library

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Last Updated: 08 June 2022

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The Importance of Lake Emergent Aquatic Vegetation for Estimating Arctic‐Boreal Methane Emissions

"Areas of lakes that support emergent aquatic vegetation emit disproportionately more methane than open water, according to upscaled estimates of lake greenhouse gas emissions, but are less represented than open water. " We combine airborne SAR mapping with field observations of vegetated and open-u2010water methane flux to determine the contribution of lake emergent vegetation zones to landscape-u2010scale methane emissions. We use Uninhabited Aerial Vehicle SAR data from the NASA Arctic Culnerability Experiment to map LEV in 4,572 lakes across four Arctic u2013boreal study regions, showing significant regional variations and exceeding previous estimates. According to estimates that do not distinguish lake zones, we find that including LEVs in aquatic areas that may be accounted for as wetlands raises overall lake emissions by 21 [18-2025] percent relative to those that do not distinguish lake zones. With more data from all lake zones, Arcticu2010boreal lake methane upscaling estimates can be improved.

Source link: https://onlinelibrary.wiley.com/doi/10.1029/2021JG006635


Non‐native plant invasion can accelerate global climate change by increasing wetland methane and terrestrial nitrous oxide emissions

"However, a systematic review of the effect of non-u2010native plant invasion on GHG dynamics on a global basis has yet to be conducted, making it difficult to determine the exact physiological responses of non-u2010native plant invasion to global climate change. " In native sites, 0. 76 kg N2O hau20131 yr. u20131 hau20131 to 1. 35 kg N2O hau20131 yru20131 hau20131 yru20131 hau20131 yru20131 to 1. 35 kg N2O hau20131 yru20131 hau20131 yru20131 hau20131 ha hau20131 hau2013 The responses of terrestrial CH4 uptake to plant invasion were largely influenced by MAT, soil NH4+, and soil moisture. Our metau2010 report not only sheds light on the effects of plant invasion on GHG emissions from wetland and terrestrial ecosystems but also expands our current knowledge of the mechanisms that underpin plant migration's responses.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/gcb.16290


A 130‐year global inventory of methane emissions from livestock: trends, patterns, and drivers

"We estimated CH4 emissions from global livestock using the Tier 2 scheme, which was changed from the 2019 Refinement to 2006 IPCC guidelines, with a spatial resolution of 0. 083 b0 during the period 1890–202020. Tg CH4 yru20101 in 1890 to 131. 7 Tg CH4 yru2021237. 1] in 2019, a fourfold rise in the first 130 years. We find that global CH4 emissions from livestock increased from 31. 8 [26. 5] to 131. 7 [109. 6 u2212153. 7] Tg CH4 yru20191 in 2018, a fourfold rise in the last four years. As compared to the previous Tier 1 estimates, our estimate shows faster growth in livestock CH4 emissions as compared to the previous Tier 1 estimates, which is 20% higher than FAOSTAT's estimate for the year 2019. "Emission hotspots and trends of livestock CH4 emissions have been found in ozone- and global datasets, which may help to guide effective CH4 mitigation strategies in the livestock industry on both local and global scales. ".

Source link: https://onlinelibrary.wiley.com/doi/10.1111/gcb.16280


Impoundment increases methane emissions in Phragmites‐invaded coastal wetlands

"Yes, but widespread monitoring of coastal wetlands has limited tidal exchange in large areas of coastal wetlands. " For informing climate effects of blue carbon restoration and/or management interventions, understanding controls and scaling of carbon exchange in these understudied ecosystems is vital. Useing eddy covariance at the Herring River in Wellfleet, Massachusetts, we investigate how carbon fluxes vary across a salinity gradient in impounded and natural, tidally unrestricted Phragmites wetlands. paraphrasedoutput:u22121 year u22121 year-u202121 offset by CH4 emissions of 11. 4 g CO2u202121 year ago 2011C mu22121 year since the impounded wetland experienced little change in water level or salinity during the growing season, but there was no change in wateru2010C's CO2 sinkage of 11. 4 g CO2u22121 year-u22121 year u22121 year-u22121. u22121 yearu22121 year u22121 yearu22121 yearu22121121 u22121 yearu22121 122121121 yearu202121121 yearu22121 u202121 yearu22121 yearu20121 yearu22121 yearu20121 yearu22121 yearu2010C u202121 yearu22121 yearu202122121, 122121, u2010C 102121 yearu22121 yearu202121 yearu Restoration of tidal flow to impounded ecosystems could restrict CH4 production and increase climate control benefits. ".

Source link: https://onlinelibrary.wiley.com/doi/10.1111/gcb.16217


High methane emissions from an anoxic fjord driven by mixing and oxygenation

"Aceanic methane budgets lack data from high-u2010latitude fjords that often act as intermittently anoxic ecosystems with potentially high methane emissions. " Between 2009 and 2021, we carried out 15 expeditions and 49 in situ lander deployments in an anoxic Scandinavian fjord. U21121 du22121, a 122-day sea-fluence flux peak of 641 mu202122 du22121. Natural and engineered mixing events displaced methaneu2010rich bottom waters, increasing upper water levels, and producing high sea–u2013air flux exceeding 641 m u202121. Mixing also reduced pelagic methane oxidation from 70% to 20% of all methane sources into the fjord. ".

Source link: https://onlinelibrary.wiley.com/doi/10.1002/lol2.10259


Fencing farm dams to exclude livestock halves methane emissions and improves water quality

"Agricultural techniques have produced tens of millions of small artificial water bodies in order to supply water for domestic livestock around the world. " Farm dams have some of the highest greenhouse gas emissions per m2 as a result of fertilizer and manure run-u2010off, which made methane production more potent. Fenced farm dams had 32% less dissolved nitrogen, 39% less dissolved phosphorus, 22% more dissolved oxygen, and produced 56% less diffusive methane emissions than unfenced dams, with 32% less dissolved nitrogen, 39% less dissolved phosphorus, 22% less dissolved oxygen, 22% less dissolved oxygen, and 56% less permethane, 22% less apparent methane, 22% less dissolved oxygen, and produced 56% less dissolved phosphorus We found no effect of farm dam management on diffusive carbon dioxide emissions and organic carbon in the soil. "Understanded oxygen was the most significant variable describing shifts in carbon fluxes across dams, with a 74% decrease in methane fluxes, a 124% decrease in carbon dioxide fluxes, and a 96% decrease in CO2 u2010eq fluxes. ".

Source link: https://onlinelibrary.wiley.com/doi/10.1111/gcb.16237


Global methane and nitrous oxide emissions from inland waters and estuaries

"Here, we synthesize 2997 in-u2010situ flux or concentration measurements of CH4 and N2O from 277 peer-reviewed journals to determine global CH4 and N2O emissions from inland waters and estuaries. CH4 and N2O emissions from these four inland aquatic ecosystems account for nearly half of CO2 emissions from these four inland aquatic ecosystems, of which lakes are the country's largest emitter for both CH4 and N2O. Ebullition emerged as a key flux component of CH4, accounting for up to 62%u201384% of total CH4 fluxes in all inland waters. Both CH4 and N2O fluxes from inland waters were determined by water dissolved oxygen, which was the most significant factor among all variables. According to the estimated indirect N2O EF5 values for inland waters and estuaries, a downward refinement is required in the latest IPCC default EF5 norms for inland waters and estuaries.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/gcb.16233


Effect of timing of paddock allocation in tropical grass on performance, nitrogen excretion, and enteric methane emissions from dairy cows

"The aim of this research was to investigate the effects of paddock allocation in tropical grass on the herbage, dry matter intake, milk yield, and composition, ruminal fermentation, nitrogen excretion, and enteric CH4 emissions of dairy cows. However, milk protein and casein yields increased for PM than AM, while AM's milk urea nitrogen concentration was lower for PM than AM. The afternoon nutritional value of the afternoon relative to the morning herbage was not sufficient to raise DMI and milk yield or decrease CH4 emission intensity by the dairy cows as hypothesized. The results indicate that PM treatment can be a simple and effective grazing tactic that results in an herbage harvest with greater nutritional value and reduced urea N excretion into milk.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/asj.13734

* 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