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Articoli di riviste sul tema "Atmospheric methane"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Arora, Vivek K., Joe R. Melton, and David Plummer. "An assessment of natural methane fluxes simulated by the CLASS-CTEM model." Biogeosciences 15, no. 15 (2018): 4683–709. http://dx.doi.org/10.5194/bg-15-4683-2018.

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Abstract. Natural methane emissions from wetlands and fire, and soil uptake of methane, simulated using the Canadian Land Surface Scheme and Canadian Terrestrial Ecosystem (CLASS-CTEM) modelling framework, over the historical 1850–2008 period, are assessed by using a one-box model of atmospheric methane burden. This one-box model also requires anthropogenic emissions and the methane sink in the atmosphere to simulate the historical evolution of global methane burden. For this purpose, global anthropogenic methane emissions for the period 1850–2008 were reconstructed based on the harmonized rep

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Jensen, Sigmund, Anders Priemé, and Lars Bakken. "Methanol Improves Methane Uptake in Starved Methanotrophic Microorganisms." Applied and Environmental Microbiology 64, no. 3 (1998): 1143–46. http://dx.doi.org/10.1128/aem.64.3.1143-1146.1998.

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ABSTRACT Methanotrophs in enrichment cultures grew and sustained atmospheric methane oxidation when supplied with methanol. If they were not supplied with methanol or formate, their atmospheric methane oxidation came to a halt, but it was restored within hours in response to methanol or formate. Indigenous forest soil methanotrophs were also dependent on a supply of methanol upon reduced methane access but only when exposed to a methane-free atmosphere. Their immediate response to each methanol addition, however, was to shut down the oxidation of atmospheric methane and to reactivate atmospher

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3

Stevens, C. M. "Atmospheric methane." Chemical Geology 71, no. 1-3 (1988): 11–21. http://dx.doi.org/10.1016/0009-2541(88)90102-7.

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4

Gorham, Katrine A., Sam Abernethy, Tyler R. Jones, et al. "Opinion: A research roadmap for exploring atmospheric methane removal via iron salt aerosol." Atmospheric Chemistry and Physics 24, no. 9 (2024): 5659–70. http://dx.doi.org/10.5194/acp-24-5659-2024.

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Abstract. The escalating climate crisis requires rapid action to reduce the concentrations of atmospheric greenhouse gases and lower global surface temperatures. Methane will play a critical role in near-term warming due to its high radiative forcing and short atmospheric lifetime. Methane emissions have accelerated in recent years, and there is significant risk and uncertainty associated with the future growth in natural emissions. The largest natural sink of methane occurs through oxidation reactions with atmospheric hydroxyl and chlorine radicals. Enhanced atmospheric oxidation could be a p

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5

Catling, D. C., M. W. Claire, and K. J. Zahnle. "Anaerobic methanotrophy and the rise of atmospheric oxygen." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 365, no. 1856 (2007): 1867–88. http://dx.doi.org/10.1098/rsta.2007.2047.

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In modern marine sediments, the anoxic decomposition of organic matter generates a significant flux of methane that is oxidized microbially with sulphate under the seafloor and never reaches the atmosphere. In contrast, prior to ca 2.4 Gyr ago, the ocean had little sulphate to support anaerobic oxidation of methane (AOM) and the ocean should have been an important methane source. As atmospheric O 2 and seawater sulphate levels rose on the early Earth, AOM would have increasingly throttled the release of methane. We use a biogeochemical model to simulate the response of early atmospheric O 2 an

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6

Buzan, E. M., C. A. Beale, C. D. Boone, and P. F. Bernath. "Global stratospheric measurements of the isotopologues of methane from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer." Atmospheric Measurement Techniques Discussions 8, no. 10 (2015): 11171–207. http://dx.doi.org/10.5194/amtd-8-11171-2015.

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Abstract. This paper presents an analysis of observations of methane and its two major isotopologues, CH3D and 13CH4 from the Atmospheric Chemistry Experiment (ACE) satellite between 2004 and 2013. Additionally, atmospheric methane chemistry is modeled using the Whole Atmospheric Community Climate Model (WACCM). ACE retrievals of methane extend from 6 km for all isotopologues to 75 km for 12CH4, 35 km for CH3D, and 50 km for 13CH4. While total methane concentrations retrieved from ACE agree well with the model, values of δD–CH4 and δ13C–CH4 show a bias toward higher δ compared to the model and

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7

Duda, Adam. "The Impact of Atmospheric Pressure Changes on Methane Emission from Goafs to Coal Mine Workings." Energies 17, no. 1 (2023): 173. http://dx.doi.org/10.3390/en17010173.

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Increased effectiveness of methane drainage from sealed post-mining goaves in hard coal mines contributes to reduced methane emission from goaves into the mine ventilation system. This paper focuses on issues concerning the assessment of the additional amount of methane released from the goaf into mine workings during periods of atmospheric pressure drops, which can be captured with a methane drainage system. Thanks to the solutions presented in the paper, it is possible to control the efficiency of the goaf drainage system, which in turn leads to the reduction of methane emission from the min

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8

Wang, Jin, and Qinghua Peter He. "Methane Removal from Air: Challenges and Opportunities." Methane 2, no. 4 (2023): 404–14. http://dx.doi.org/10.3390/methane2040027.

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Driven by increasing greenhouse gas (GHG) concentrations in the atmosphere, extreme weather events have become more frequent and their impacts on human lives have become more severe. Therefore, the need for short-term GHG mitigations is urgent. Recently, methane has been recognized as an important mitigation target due to its high global warming potential (GWP). However, methane’s low concentration in the atmosphere and stable molecular structure make its removal from the air highly challenging. This review first discusses the fundamental aspects of the challenges in atmospheric methane remova

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9

Bussmann, Ingeborg, Eric P. Achterberg, Holger Brix, et al. "Influence of wind strength and direction on diffusive methane fluxes and atmospheric methane concentrations above the North Sea." Biogeosciences 21, no. 16 (2024): 3819–38. http://dx.doi.org/10.5194/bg-21-3819-2024.

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Abstract. Quantification of the diffusive methane fluxes between the coastal ocean and atmosphere is important to constrain the atmospheric methane budget. The determination of the fluxes in coastal waters is characterized by a high level of uncertainty. To improve the accuracy of the estimation of coastal methane fluxes, high temporal and spatial sampling frequencies of dissolved methane in seawater are required, as well as the quantification of atmospheric methane concentrations, wind speed and wind direction above the ocean. In most cases, these atmospheric data are obtained from land-based

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10

Meng, L., R. Paudel, P. G. M. Hess, and N. M. Mahowald. "Seasonal and interannual variability in wetland methane emissions simulated by CLM4Me' and CAM-chem and comparisons to observations of concentrations." Biogeosciences 12, no. 13 (2015): 4029–49. http://dx.doi.org/10.5194/bg-12-4029-2015.

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Abstract. Understanding the temporal and spatial variation of wetland methane emissions is essential to the estimation of the global methane budget. Our goal for this study is three-fold: (i) to evaluate the wetland methane fluxes simulated in two versions of the Community Land Model, the Carbon-Nitrogen (CN; i.e., CLM4.0) and the Biogeochemistry (BGC; i.e., CLM4.5) versions using the methane emission model CLM4Me' so as to determine the sensitivity of the emissions to the underlying carbon model; (ii) to compare the simulated atmospheric methane concentrations to observations, including latit

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11

Berchet, Antoine, Philippe Bousquet, Isabelle Pison, et al. "Atmospheric constraints on the methane emissions from the East Siberian Shelf." Atmospheric Chemistry and Physics 16, no. 6 (2016): 4147–57. http://dx.doi.org/10.5194/acp-16-4147-2016.

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Abstract. Subsea permafrost and hydrates in the East Siberian Arctic Shelf (ESAS) constitute a substantial carbon pool, and a potentially large source of methane to the atmosphere. Previous studies based on interpolated oceanographic campaigns estimated atmospheric emissions from this area at 8–17 TgCH4 yr−1. Here, we propose insights based on atmospheric observations to evaluate these estimates. The comparison of high-resolution simulations of atmospheric methane mole fractions to continuous methane observations during the whole year 2012 confirms the high variability and heterogeneity of the

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12

Keppler, Frank, Mihály Boros, Christian Frankenberg, et al. "Methane formation in aerobic environments." Environmental Chemistry 6, no. 6 (2009): 459. http://dx.doi.org/10.1071/en09137.

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Environmental context. Methane is an important greenhouse gas and its atmospheric concentration has drastically increased since pre-industrial times. Until recently biological methane formation has been associated exclusively with anoxic environments and microbial activity. In this article we discuss several alternative formation pathways of methane in aerobic environments and suggest that non-microbial methane formation may be ubiquitous in terrestrial and marine ecosystems. Abstract. Methane (CH4), the second principal anthropogenic greenhouse gas after CO2, is the most abundant reduced orga

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13

Meng, L., R. Paudel, P. G. M. Hess, and N. M. Mahowald. "Seasonal and inter-annual variability in wetland methane emissions simulated by CLM4Me' and CAM-chem and comparisons to observations of concentrations." Biogeosciences Discussions 12, no. 3 (2015): 2161–212. http://dx.doi.org/10.5194/bgd-12-2161-2015.

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Abstract. Understanding the temporal and spatial variation of wetland methane emissions is essential to the estimation of the global methane budget. We examine the seasonal and inter-annual variability in wetland methane emissions simulated in the Community Land Model (CLM4Me'). Methane emissions from both the Carbon-Nitrogen (CN, i.e. CLM4.0) and the Biogeochemistry (BGC, i.e. CLM4.5) versions of the CLM are evaluated. We further conduct simulations of the transport and removal of methane using the Community Atmosphere Model (CAM-chem) model using CLM4Me' methane emissions from both CN and BG

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14

Allen, Robert J., Xueying Zhao, Cynthia A. Randles, Ryan J. Kramer, Bjørn H. Samset, and Christopher J. Smith. "Present-day methane shortwave absorption mutes surface warming relative to preindustrial conditions." Atmospheric Chemistry and Physics 24, no. 19 (2024): 11207–26. http://dx.doi.org/10.5194/acp-24-11207-2024.

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Abstract. Recent analyses show the importance of methane shortwave absorption, which many climate models lack. In particular, Allen et al. (2023) used idealized climate model simulations to show that methane shortwave absorption mutes up to 30 % of the surface warming and 60 % of the precipitation increase associated with its longwave radiative effects. Here, we explicitly quantify the radiative and climate impacts due to shortwave absorption of the present-day methane perturbation. Our results corroborate the hypothesis that present-day methane shortwave absorption mutes the warming effects o

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15

Buzan, Eric M., Chris A. Beale, Chris D. Boone, and Peter F. Bernath. "Global stratospheric measurements of the isotopologues of methane from the Atmospheric Chemistry Experiment Fourier transform spectrometer." Atmospheric Measurement Techniques 9, no. 3 (2016): 1095–111. http://dx.doi.org/10.5194/amt-9-1095-2016.

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Abstract. This paper presents an analysis of observations of methane and its two major isotopologues, CH3D and 13CH4, from the Atmospheric Chemistry Experiment (ACE) satellite between 2004 and 2013. Additionally, atmospheric methane chemistry is modeled using the Whole Atmospheric Community Climate Model (WACCM). ACE retrievals of methane extend from 6 km for all isotopologues to 75 km for 12CH4, 35 km for CH3D, and 50 km for 13CH4. While total methane concentrations retrieved from ACE agree well with the model, values of δD–CH4 and δ13C–CH4 show a bias toward higher δ compared to the model an

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16

Pekarnikova, M. Е., and K. B. Valiullina. "Legal Regulation of Methane Emissions and Its Role in Supporting the Goal of the Paris Agreement: General Issues." Uchenye Zapiski Kazanskogo Universiteta Seriya Gumanitarnye Nauki 166, no. 6 (2025): 145–59. https://doi.org/10.26907/2541-7738.2024.6.145-159.

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This article explores the current legal and regulatory practices on lowering atmospheric methane, the main short-lived gaseous pollutant, adopted by the world’s largest methane emitters. In 2021, many countries joined the Global Methane Pledge (GMP), a joint international initiative, which has since been the guiding framework for estimating and reducing global methane levels. The GMP’s primary task is to support the goal of the Paris Agreement on climate change. Due to methane’s short life and the phenomenon referred to as the methane paradox, it has become clear that abandoning hydrocarbons c

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17

Mazánková, V., L. Töröková, D. Trunec, F. Krčma, S. Matejčík, and N. J. Mason. "Diagnostics of Nitrogen-methane Atmospheric Glow Discharge Used for a Mimic of Prebiotic Atmosphere." PLASMA PHYSICS AND TECHNOLOGY 4, no. 1 (2017): 83–86. http://dx.doi.org/10.14311/ppt.2017.1.83.

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The exploration of planetary atmosphere is being advanced by the exciting results of the Cassin-Huygens mission to Titan. The complex chemistry revealed in such atmospheres leading to the synthesis of bigger molecules is providing new insights into our understanding of how life on Earth developed. This work extends our previous investigation of nitrogen-methane (N<sub>2</sub>-CH<sub>4</sub>) atmospheric glow discharge for simulation chemical processes in prebiotic atmospheres. In presented experiments 2 % of water vapor were addet to nitrogen-methane gas mixture. Exhaus

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Stevenson, David S., Richard G. Derwent, Oliver Wild, and William J. Collins. "COVID-19 lockdown emission reductions have the potential to explain over half of the coincident increase in global atmospheric methane." Atmospheric Chemistry and Physics 22, no. 21 (2022): 14243–52. http://dx.doi.org/10.5194/acp-22-14243-2022.

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Abstract. Compared with 2019, measurements of the global growth rate of background (marine air) atmospheric methane rose by 5.3 ppb yr−1 in 2020, reaching 15.0 ppb yr−1. Global atmospheric chemistry models have previously shown that reductions in nitrogen oxide (NOx) emissions reduce levels of the hydroxyl radical (OH) and lengthen the methane lifetime. Acting in the opposite sense, reductions in carbon monoxide (CO) and non-methane volatile organic compound (NMVOC) emissions increase OH and shorten methane's lifetime. Using estimates of NOx, CO, and NMVOC emission reductions associated with C

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19

Berchet, A., P. Bousquet, I. Pison, et al. "Atmospheric constraints on the methane emissions from the East Siberian Shelf." Atmospheric Chemistry and Physics Discussions 15, no. 18 (2015): 25477–501. http://dx.doi.org/10.5194/acpd-15-25477-2015.

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Abstract. Sub-sea permafrost and hydrates in the East Siberian Arctic Ocean Continental Shelf (ESAS) constitute a substantial carbon pool, and a potentially large source of methane to the atmosphere. Previous studies based on interpolated oceanographic campaigns estimated atmospheric emissions from this area at 8–17 Tg CH4 y−1. Here, we propose insights based on atmospheric observations to evaluate these estimates. Isotopic observations suggest a biogenic origin (either terrestrial or marine) of the methane in air masses originating from ESAS during summer 2010. The comparison of high-resoluti

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20

Jackson, Robert B., Sam Abernethy, Josep G. Canadell, et al. "Atmospheric methane removal: a research agenda." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2210 (2021): 20200454. http://dx.doi.org/10.1098/rsta.2020.0454.

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Atmospheric methane removal (e.g. in situ methane oxidation to carbon dioxide) may be needed to offset continued methane release and limit the global warming contribution of this potent greenhouse gas. Because mitigating most anthropogenic emissions of methane is uncertain this century, and sudden methane releases from the Arctic or elsewhere cannot be excluded, technologies for methane removal or oxidation may be required. Carbon dioxide removal has an increasingly well-established research agenda and technological foundation. No similar framework exists for methane removal. We believe that a

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21

Murphy, Matthew M., Thomas G. Beatty, Luis Welbanks, and Guangwei Fu. "HST Transmission Spectra of the Hot Neptune HD 219666 b: Detection of Water and the Challenge of Constraining Both Water and Methane." Astronomical Journal 169, no. 6 (2025): 286. https://doi.org/10.3847/1538-3881/adc684.

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Abstract Although Neptunian-sized (2–5 R ⊕) planets appear to be extremely common in the Galaxy, many mysteries remain about their overall nature. To date, only 11 Neptunian-sized planets have had their atmospheres spectroscopically characterized, and these observations hint at interesting diversity within this class of planets. Much of our understanding of these worlds and others derive from transmission spectroscopy with the Hubble Space Telescope’s Wide Field Camera 3 (HST/WFC3). One key outcome of HST/WFC3 observations has been the consistent detection of water but no methane in Neptunian

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22

SHUKLA, J. B., SHYAM SUNDAR, ASHISH KUMAR MISHRA, and RAM NARESH. "NUMERICAL MODEL ON METHANE EMISSIONS FROM AGRICULTURE SECTOR." International Journal of Big Data Mining for Global Warming 02, no. 01 (2020): 2050003. http://dx.doi.org/10.1142/s2630534820500035.

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Atmospheric methane, emitted from agriculture sector such as production of rice paddies and farming of livestock populations, is one of the important factors responsible for increasing the average atmospheric temperature leading to global warming. It is, therefore, crucial to comprehend the dynamics of methane emission and its effect on global warming. In this paper, a nonlinear mathematical model is proposed and analyzed to study the increase of average atmospheric temperature (or average global warming temperature) caused by emission of methane due to various processes involved in the produc

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Foschi, Martino, Joseph A. Cartwright, Christopher W. MacMinn, and Giuseppe Etiope. "Evidence for massive emission of methane from a deep‐water gas field during the Pliocene." Proceedings of the National Academy of Sciences 117, no. 45 (2020): 27869–76. http://dx.doi.org/10.1073/pnas.2001904117.

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Geologic hydrocarbon seepage is considered to be the dominant natural source of atmospheric methane in terrestrial and shallow‐water areas; in deep‐water areas, in contrast, hydrocarbon seepage is expected to have no atmospheric impact because the gas is typically consumed throughout the water column. Here, we present evidence for a sudden expulsion of a reservoir‐size quantity of methane from a deep‐water seep during the Pliocene, resulting from natural reservoir overpressure. Combining three-dimensional seismic data, borehole data and fluid‐flow modeling, we estimate that 18–27 of the 23–31

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Zazzeri, Giulia, Dave Lowry, Rebecca E. Fisher, et al. "Carbon isotopic signature of coal-derived methane emissions to the atmosphere: from coalification to alteration." Atmospheric Chemistry and Physics 16, no. 21 (2016): 13669–80. http://dx.doi.org/10.5194/acp-16-13669-2016.

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Abstract. Currently, the atmospheric methane burden is rising rapidly, but the extent to which shifts in coal production contribute to this rise is not known. Coalbed methane emissions into the atmosphere are poorly characterised, and this study provides representative δ13CCH4 signatures of methane emissions from specific coalfields. Integrated methane emissions from both underground and opencast coal mines in the UK, Australia and Poland were sampled and isotopically characterised. Progression in coal rank and secondary biogenic production of methane due to incursion of water are suggested as

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Turner, Alexander J., Christian Frankenberg, and Eric A. Kort. "Interpreting contemporary trends in atmospheric methane." Proceedings of the National Academy of Sciences 116, no. 8 (2019): 2805–13. http://dx.doi.org/10.1073/pnas.1814297116.

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Atmospheric methane plays a major role in controlling climate, yet contemporary methane trends (1982–2017) have defied explanation with numerous, often conflicting, hypotheses proposed in the literature. Specifically, atmospheric observations of methane from 1982 to 2017 have exhibited periods of both increasing concentrations (from 1982 to 2000 and from 2007 to 2017) and stabilization (from 2000 to 2007). Explanations for the increases and stabilization have invoked changes in tropical wetlands, livestock, fossil fuels, biomass burning, and the methane sink. Contradictions in these hypotheses

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Kleinen, Thomas, Sergey Gromov, Benedikt Steil, and Victor Brovkin. "Atmospheric methane since the last glacial maximum was driven by wetland sources." Climate of the Past 19, no. 5 (2023): 1081–99. http://dx.doi.org/10.5194/cp-19-1081-2023.

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Abstract. Atmospheric methane (CH4) has changed considerably in the time between the last glacial maximum (LGM) and the preindustrial (PI) periods. We investigate these changes in transient experiments with an Earth system model capable of simulating the global methane cycle interactively, focusing on the rapid changes during the deglaciation, especially pronounced in the Bølling–Allerød (BA) and Younger Dryas (YD) periods. We consider all relevant natural sources and sinks of methane and examine the drivers of changes in methane emissions as well as in the atmospheric lifetime of methane. We

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Smith, H. J. "ATMOSPHERIC SCIENCE: Sourcing Methane." Science 316, no. 5826 (2007): 799b. http://dx.doi.org/10.1126/science.316.5826.799b.

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Wilson, Jason. "Natural atmospheric methane contributions." Marine Pollution Bulletin 28, no. 4 (1994): 194–95. http://dx.doi.org/10.1016/0025-326x(94)90085-x.

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Badr, O., S. D. Probert, and P. W. O'Callaghan. "Origins of atmospheric methane." Applied Energy 40, no. 3 (1991): 189–231. http://dx.doi.org/10.1016/0306-2619(91)90057-5.

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Badr, O., S. D. Probert, and P. W. O'Callaghan. "Sinks for atmospheric methane." Applied Energy 41, no. 2 (1992): 137–47. http://dx.doi.org/10.1016/0306-2619(92)90041-9.

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Bange, Hermann W., Tom G. Bell, Marcela Cornejo, et al. "MEMENTO: a proposal to develop a database of marine nitrous oxide and methane measurements." Environmental Chemistry 6, no. 3 (2009): 195. http://dx.doi.org/10.1071/en09033.

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Environmental context. Nitrous oxide and methane are atmospheric trace gases and, because they are strong greenhouse gases, they contribute significantly to the ongoing global warming of the Earth’s atmosphere. Despite the well established fact that the world’s oceans release nitrous oxide and methane to the atmosphere, the oceanic emission estimates of both gases are only poorly quantified. The MEMENTO (MarinE MethanE and NiTrous Oxide) database initiative is proposed as an effective way by which existing nitrous oxide and methane measurements can be used to reduce the uncertainty of the ocea

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Holmes, Andrew J., Peter Roslev, Ian R. McDonald, Niels Iversen, Kaj Henriksen, and J. Colin Murrell. "Characterization of Methanotrophic Bacterial Populations in Soils Showing Atmospheric Methane Uptake." Applied and Environmental Microbiology 65, no. 8 (1999): 3312–18. http://dx.doi.org/10.1128/aem.65.8.3312-3318.1999.

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ABSTRACT The global methane cycle includes both terrestrial and atmospheric processes and may contribute to feedback regulation of the climate. Most oxic soils are a net sink for methane, and these soils consume approximately 20 to 60 Tg of methane per year. The soil sink for atmospheric methane is microbially mediated and sensitive to disturbance. A decrease in the capacity of this sink may have contributed to the ∼1% · year−1 increase in the atmospheric methane level in this century. The organisms responsible for methane uptake by soils (the atmospheric methane sink) are not known, and facto

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Topp, Edward, and Elizabeth Pattey. "Soils as sources and sinks for atmospheric methane." Canadian Journal of Soil Science 77, no. 2 (1997): 167–77. http://dx.doi.org/10.4141/s96-107.

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Methane is considered to be a significant greenhouse gas. Methane is produced in soils as the end product of the anaerobic decomposition of organic matter. In the absence of oxygen, methane is very stable, but under aerobic conditions it is mineralized to carbon dioxide by methanotrophic bacteria. Soil methane emissions, primarily from natural wetlands, landfills and rice paddies, are estimated to represent about half of the annual global methane production. Oxidation of atmospheric methane by well-drained soils accounts for about 10% of the global methane sink. Whether a soil is a net source

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Madhusudhan, Nikku, Subhajit Sarkar, Savvas Constantinou, Måns Holmberg, Anjali A. A. Piette, and Julianne I. Moses. "Carbon-bearing Molecules in a Possible Hycean Atmosphere." Astrophysical Journal Letters 956, no. 1 (2023): L13. http://dx.doi.org/10.3847/2041-8213/acf577.

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Abstract The search for habitable environments and biomarkers in exoplanetary atmospheres is the holy grail of exoplanet science. The detection of atmospheric signatures of habitable Earth-like exoplanets is challenging owing to their small planet–star size contrast and thin atmospheres with high mean molecular weight. Recently, a new class of habitable exoplanets, called Hycean worlds, has been proposed, defined as temperate ocean-covered worlds with H2-rich atmospheres. Their large sizes and extended atmospheres, compared to rocky planets of the same mass, make Hycean worlds significantly mo

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Joelsson, L. M. T., J. A. Schmidt, E. J. K. Nilsson, et al. "Development of a new methane tracer: kinetic isotope effect of <sup>13</sup>CH<sub>3</sub>D + OH from 278 to 313 K." Atmospheric Chemistry and Physics Discussions 15, no. 19 (2015): 27853–75. http://dx.doi.org/10.5194/acpd-15-27853-2015.

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Abstract. Methane is the second most important long lived greenhouse gas and impacts the oxidative capacity of the Earth's atmosphere. Nontheless there are significant uncertainties in its source budget. Analysis of the isotopic composition of atmospheric methane, including doubly substituted species (e.g. 13CH3D), offers new constraints on the methane source budget as the sources and sinks have distinct isotopic signatures. The most important sink of atmospheric methane is oxidation by OH which accounts for around 90 % of methane removal in the troposphere. Here we present experimentally deri

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Ferretti, D. F., J. B. Miller, J. W. C. White, K. R. Lassey, D. C. Lowe, and D. M. Etheridge. "Stable isotopes provide revised global limits of aerobic methane emissions from plants." Atmospheric Chemistry and Physics 7, no. 1 (2007): 237–41. http://dx.doi.org/10.5194/acp-7-237-2007.

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Abstract. Recently Keppler et al. (2006) discovered a surprising new source of methane – terrestrial plants under aerobic conditions, with an estimated global production of 62–236 Tg yr−1 by an unknown mechanism. This is ~10–40% of the annual total of methane entering the modern atmosphere and ~30–100% of annual methane entering the pre-industrial (0 to 1700 AD) atmosphere. Here we test this reported global production of methane from plants against ice core records of atmospheric methane concentration (CH4) and stable carbon isotope ratios (δ13CH4) over the last 2000 years. Our top-down approa

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37

Tveit, Alexander T., Anne Grethe Hestnes, Serina L. Robinson, et al. "Widespread soil bacterium that oxidizes atmospheric methane." Proceedings of the National Academy of Sciences 116, no. 17 (2019): 8515–24. http://dx.doi.org/10.1073/pnas.1817812116.

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The global atmospheric level of methane (CH4), the second most important greenhouse gas, is currently increasing by ∼10 million tons per year. Microbial oxidation in unsaturated soils is the only known biological process that removes CH4from the atmosphere, but so far, bacteria that can grow on atmospheric CH4have eluded all cultivation efforts. In this study, we have isolated a pure culture of a bacterium, strain MG08 that grows on air at atmospheric concentrations of CH4[1.86 parts per million volume (p.p.m.v.)]. This organism, namedMethylocapsa gorgona, is globally distributed in soils and

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Zhou, Wencai, Xueying Qiu, Yuheng Jiang, et al. "Highly selective aerobic oxidation of methane to methanol over gold decorated zinc oxide via photocatalysis." Journal of Materials Chemistry A 8, no. 26 (2020): 13277–84. http://dx.doi.org/10.1039/d0ta02793f.

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39

Benstead, J., G. M. King, and H. G. Williams. "Methanol Promotes Atmospheric Methane Oxidation by Methanotrophic Cultures and Soils." Applied and Environmental Microbiology 64, no. 3 (1998): 1091–98. http://dx.doi.org/10.1128/aem.64.3.1091-1098.1998.

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ABSTRACT Two methanotrophic bacteria, Methylobacter albus BG8 and Methylosinus trichosporium OB3b, oxidized atmospheric methane during batch growth on methanol. Methane consumption was rapidly and substantially diminished (95% over 9 days) when washed cell suspensions were incubated without methanol in the presence of atmospheric methane (1.7 ppm). Methanotrophic activity was stimulated after methanol (10 mM) but not methane (1,000 ppm) addition. M. albus BG8 grown in continuous culture for 80 days with methanol retained the ability to oxidize atmospheric methane and oxidized methane in a chem

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40

Archer, D. "A model of the methane cycle, permafrost, and hydrology of the Siberian continental margin." Biogeosciences 12, no. 10 (2015): 2953–74. http://dx.doi.org/10.5194/bg-12-2953-2015.

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Abstract. A two-dimensional model of a sediment column, with Darcy fluid flow, biological and thermal methane production, and permafrost and methane hydrate formation, is subjected to glacial–interglacial cycles in sea level, alternately exposing the continental shelf to the cold atmosphere during glacial times and immersing it in the ocean in interglacial times. The glacial cycles are followed by a "long-tail" 100 kyr warming due to fossil fuel combustion. The salinity of the sediment column in the interior of the shelf can be decreased by hydrological forcing to depths well below sea level w

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41

Joelsson, L. M. T., J. A. Schmidt, E. J. K. Nilsson, et al. "Kinetic isotope effects of <sup>12</sup>CH<sub>3</sub>D + OH and <sup>13</sup>CH<sub>3</sub>D + OH from 278 to 313 K." Atmospheric Chemistry and Physics 16, no. 7 (2016): 4439–49. http://dx.doi.org/10.5194/acp-16-4439-2016.

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Abstract. Methane is the second most important long-lived greenhouse gas and plays a central role in the chemistry of the Earth's atmosphere. Nonetheless there are significant uncertainties in its source budget. Analysis of the isotopic composition of atmospheric methane, including the doubly substituted species 13CH3D, offers new insight into the methane budget as the sources and sinks have distinct isotopic signatures. The most important sink of atmospheric methane is oxidation by OH in the troposphere, which accounts for around 84 % of all methane removal. Here we present experimentally der

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42

MacAyeal, Douglas R., and Dean R. Lindstrom. "Effects of Glaciation on Methane-Hydrate Stability." Annals of Glaciology 14 (1990): 183–85. http://dx.doi.org/10.3189/s0260305500008533.

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Abstract (sommario):

Temperature and pressure changes within subglacial sediments caused by déglaciation favor a phase change from methane hydrate to methane gas. If released to the atmosphere, this gas could have contributed significantly to the increased atmospheric methane concentration during interglacial periods. Using a numerical reconstruction of sediment temperatures and ice-sheet loads, the total sediment volume in the Eurasian Arctic that is subject to this phase change is estimated to be 2.8 × 1014 m3.

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43

MacAyeal, Douglas R., and Dean R. Lindstrom. "Effects of Glaciation on Methane-Hydrate Stability." Annals of Glaciology 14 (1990): 183–85. http://dx.doi.org/10.1017/s0260305500008533.

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Abstract (sommario):

Temperature and pressure changes within subglacial sediments caused by déglaciation favor a phase change from methane hydrate to methane gas. If released to the atmosphere, this gas could have contributed significantly to the increased atmospheric methane concentration during interglacial periods. Using a numerical reconstruction of sediment temperatures and ice-sheet loads, the total sediment volume in the Eurasian Arctic that is subject to this phase change is estimated to be 2.8 × 1014 m3.

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44

Maasakkers, Joannes D., Daniel J. Jacob, Melissa P. Sulprizio, et al. "Global distribution of methane emissions, emission trends, and OH concentrations and trends inferred from an inversion of GOSAT satellite data for 2010–2015." Atmospheric Chemistry and Physics 19, no. 11 (2019): 7859–81. http://dx.doi.org/10.5194/acp-19-7859-2019.

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Abstract (sommario):

Abstract. We use 2010–2015 observations of atmospheric methane columns from the GOSAT satellite instrument in a global inverse analysis to improve estimates of methane emissions and their trends over the period, as well as the global concentration of tropospheric OH (the hydroxyl radical, methane's main sink) and its trend. Our inversion solves the Bayesian optimization problem analytically including closed-form characterization of errors. This allows us to (1) quantify the information content from the inversion towards optimizing methane emissions and its trends, (2) diagnose error correlatio

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45

Smith, Amy Tetlow. "Environmental factors affecting global atmospheric methane concentrations." Progress in Physical Geography: Earth and Environment 19, no. 3 (1995): 322–35. http://dx.doi.org/10.1177/030913339501900302.

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Abstract (sommario):

Methane is a greenhouse gas of largely biological origin. Micro-organisms responsible for production of much of the atmospheric methane are directly affected by climate resulting in potential feedbacks between the atmosphere and the biosphere. Our current understanding of the role of methane in the climate system is reviewed in this article, with a brief discussion of biological, chemical, and physical processes responsible for the spatial and temporal distribution of atmos pheric methane. The magnitude of most methane sources is highly speculative, and their distributions are qualitatively un

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46

Xu, Zhichao, Wei Shan, Ying Guo, Chengcheng Zhang, and Lisha Qiu. "Swamp Wetlands in Degraded Permafrost Areas Release Large Amounts of Methane and May Promote Wildfires through Friction Electrification." Sustainability 14, no. 15 (2022): 9193. http://dx.doi.org/10.3390/su14159193.

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Abstract (sommario):

Affected by global warming, permafrost degradation releases a large amount of methane gas, and this part of flammable methane may increase the frequency of wildfires. To study the influence mechanism of methane emission on wildfires in degraded permafrost regions, we selected the northwest section of Xiaoxing’an Mountains in China as the study area, and combined with remote sensing data, we conducted long-term monitoring of atmospheric electric field, temperature, methane concentration, and other observation parameters, and further carried out indoor gas–solid friction tests. The study shows t

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47

Lassey, K. R., D. C. Lowe, and A. M. Smith. "The atmospheric cycling of radiomethane and the ''fossil fraction'' of the methane source." Atmospheric Chemistry and Physics Discussions 6, no. 3 (2006): 5039–56. http://dx.doi.org/10.5194/acpd-6-5039-2006.

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Abstract (sommario):

Abstract. The cycling of 14CH4 (''radiomethane'') through the atmosphere has been strongly perturbed in the industrial era by the release of 14C-free methane from geologic reservoirs (''fossil methane'' emissions), and in the nuclear era, especially since ca 1970, by the direct release of nucleogenic radiomethane from nuclear power facilities. Contemporary measurements of atmospheric radiomethane have been used to estimate the proportion of fossil methane in the global methane source (the ''fossil fraction''), but such estimates carry high uncertainty due to the ill-determined nuclear-power so

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48

He, Jian, Vaishali Naik, Larry W. Horowitz, Ed Dlugokencky, and Kirk Thoning. "Investigation of the global methane budget over 1980–2017 using GFDL-AM4.1." Atmospheric Chemistry and Physics 20, no. 2 (2020): 805–27. http://dx.doi.org/10.5194/acp-20-805-2020.

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Abstract (sommario):

Abstract. Changes in atmospheric methane abundance have implications for both chemistry and climate as methane is both a strong greenhouse gas and an important precursor for tropospheric ozone. A better understanding of the drivers of trends and variability in methane abundance over the recent past is therefore critical for building confidence in projections of future methane levels. In this work, the representation of methane in the atmospheric chemistry model AM4.1 is improved by optimizing total methane emissions (to an annual mean of 580±34 Tg yr−1) to match surface observations over 1980–

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49

Espic, C., M. Liechti, M. Battaglia, D. Paul, T. Röckmann, and S. Szidat. "Compound-Specific Radiocarbon Analysis of Atmospheric Methane: A New Preconcentration and Purification Setup." Radiocarbon 61, no. 5 (2019): 1461–76. http://dx.doi.org/10.1017/rdc.2019.76.

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Abstract (sommario):

ABSTRACTMethane contributes substantially to global warming as the second most important anthropogenic greenhouse gas. Radiocarbon (14C) measurements of atmospheric methane can be used as a source apportionment tool, as they allow distinction between thermogenic and biogenic methane sources. However, these measurements remain scarce due to labor-intensive methods required. A new setup for the preparation of atmospheric methane samples for radiocarbon analysis is presented. The system combines a methane preconcentration line with a preparative gas chromatography technique to isolate pure methan

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50

Sivan, Malavika, Thomas Röckmann, Carina van der Veen та Maria Elena Popa. "Extraction, purification, and clumped isotope analysis of methane (Δ¹³CDH₃ and Δ¹²CD₂H₂) from sources and the atmosphere". Atmospheric Measurement Techniques 17, № 9 (2024): 2687–705. http://dx.doi.org/10.5194/amt-17-2687-2024.

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Abstract (sommario):

Abstract. Measurements of the clumped isotope anomalies (Δ13CDH3 and Δ12CD2H2) of methane have shown potential for constraining methane sources and sinks. At Utrecht University, we use the Thermo Scientific Ultra high-resolution isotope-ratio mass spectrometer to measure the clumped isotopic composition of methane emitted from various sources and directly from the atmosphere. We have developed an extraction system with three sections for extracting and purifying methane from high (> 1 %), medium (0.1 % to 1 %), and low-concentration (< 0.1 %) samples, including atmospheric air (∼ 2 ppm =

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