Stable isotopic signatures (δ<sup>13</sup>C, δD) of methane from European landfill sites

Bergamaschi, P.; Lubina, C.; Königstedt, R.; Fischer, H.; Veltkamp, A.C.; Zwaagstra, O.

doi:10.1029/98jd00105

Cited by 112 publications

(105 citation statements)

References 47 publications

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“…These results contrast with the context of a booming natural gas production and the resumption of coal mining in Asia. However, it is also worth noting that the 13 C / 12 C and D / H ratio of atmospheric methane show distinctive isotope signature depending on the source type (Bergamaschi, 1997;Bergamaschi et al, 1998;Quay et al, 1999;Whiticar and Schaefer, 2007). In the same way, isotopic fractionation occurs during sink processes with specific ratios depending on the removal pathway (Gierczak et al, 1997;Irion et al, 1996;Saueressig et al, 2001;Tyler et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

The recent increase of atmospheric methane from 10 years of ground-based NDACC FTIR observations since 2005

Bader

Bovy²,

Conway

et al. 2017

Atmos. Chem. Phys.

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Abstract. Changes of atmospheric methane total columns (CH 4 ) since 2005 have been evaluated using Fourier transform infrared (FTIR) solar observations carried out at 10 ground-based sites, affiliated to the Network for Detection of Atmospheric Composition Change (NDACC). From this, we find an increase of atmospheric methane total columns of 0.31 ± 0.03 % year −1 (2σ level of uncertainty) for the 2005-2014 period. Comparisons with in situ methane measurements at both local and global scales show good agreement. We used the GEOS-Chem chemical transport model tagged simulation, which accounts for the contribution of each emission source and one sink in the total methane, simulated over 2005-2012. After regridding according to NDACC vertical layering using a conservative regridding scheme and smoothing by convolving with respective FTIR seasonal averaging kernels, the GEOS-Chem simulation shows an increase of atmospheric methane total columns of 0.35 ± 0.03 % year −1 between 2005 and 2012, which is in agreement with NDACC measurements over the same time period (0.30 ± 0.04 % year −1 , averaged over 10 stations). Analysis of the GEOS-Chem-tagged simulation allows us to quantify the contribution of each tracer to the global methane change since 2005. We find that natural sources such as wetlands and biomass burning contribute to the interannual variability of methane. However, anthropogenic emissions, such as coal mining, and gas and oil transport and exploration, which are mainly emitted in the Northern Hemisphere and act as secondary contributors to the global budget of methane, have played a major role in the increase of atmospheric methane observed since 2005. Based on the GEOSPublished by Copernicus Publications on behalf of the European Geosciences Union. W. Bader et al.: The recent increase of atmospheric methaneChem-tagged simulation, we discuss possible cause(s) for the increase of methane since 2005, which is still unexplained.

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Section: Discussionmentioning

confidence: 99%

The recent increase of atmospheric methane from 10 years of ground-based NDACC FTIR observations since 2005

Bader

Bovy²,

Conway

et al. 2017

Atmos. Chem. Phys.

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“…In air, the diffusion coefficient of 12 CH 4 exceeds that of 13 CH 4 by a factor of 1.0195 due to mass differences. No fractionation is expected when advection dominates gas transport (Bergamaschi et al, 1998;Chanton, 2005).…”

Section: Introductionmentioning

confidence: 99%

Improved quantification of microbial CH<sub>4</sub> oxidation efficiency in arctic wetland soils using carbon isotope fractionation

et al. 2013

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Abstract. Permafrost-affected tundra soils are significant sources of the climate-relevant trace gas methane (CH4). The observed accelerated warming of the arctic will cause deeper permafrost thawing, followed by increased carbon mineralization and CH4 formation in water-saturated tundra soils, thus creating a positive feedback to climate change. Aerobic CH4 oxidation is regarded as the key process reducing CH4 emissions from wetlands, but quantification of turnover rates has remained difficult so far. The application of carbon stable isotope fractionation enables the in situ quantification of CH4 oxidation efficiency in arctic wetland soils. The aim of the current study is to quantify CH4 oxidation efficiency in permafrost-affected tundra soils in Russia's Lena River delta based on stable isotope signatures of CH4. Therefore, depth profiles of CH4 concentrations and δ13CH4 signatures were measured and the fractionation factors for the processes of oxidation (αox) and diffusion (αdiff) were determined. Most previous studies employing stable isotope fractionation for the quantification of CH4 oxidation in soils of other habitats (such as landfill cover soils) have assumed a gas transport dominated by advection (αtrans = 1). In tundra soils, however, diffusion is the main gas transport mechanism and diffusive stable isotope fractionation should be considered alongside oxidative fractionation. For the first time, the stable isotope fractionation of CH4 diffusion through water-saturated soils was determined with an αdiff = 1.001 &pm; 0.000 (n = 3). CH4 stable isotope fractionation during diffusion through air-filled pores of the investigated polygonal tundra soils was αdiff = 1.013 &pm; 0.003 (n = 18). Furthermore, it was found that αox differs widely between sites and horizons (mean αox = 1.017 ± 0.009) and needs to be determined on a case by case basis. The impact of both fractionation factors on the quantification of CH4 oxidation was analyzed by considering both the potential diffusion rate under saturated and unsaturated conditions and potential oxidation rates. For a submerged, organic-rich soil, the data indicate a CH4 oxidation efficiency of 50% at the anaerobic–aerobic interface in the upper horizon. The improved in situ quantification of CH4 oxidation in wetlands enables a better assessment of current and potential CH4 sources and sinks in permafrost-affected ecosystems and their potential strengths in response to global warming.

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“…4 -6 Field studies have shown that between 10 to 100% of the emitted methane can be oxidized on an annual basis. [7][8][9] Furthermore, methane flux emission measurements have shown negative fluxes, indicating uptake of atmospheric methane and proving that in some cases, landfill cover soils may even serve as sink for atmospheric methane. 10 -12 Although attenuation of methane in landfill covers has been intensively studied to evaluate the contribution of landfills to global warming, there is little research concerning the potential for attenuation of VOCs.…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Trace Gases in Simulated Landfill Soil

Scheutz

Kjeldsen

2005

Journal of the Air & Waste Management Association

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The attenuation of methane and seven volatile organic compounds (VOCs) was investigated in a dynamic methane and oxygen counter gradient system simulating a landfill soil cover. The VOCs investigated were: Tetrachloromethane (TeCM), trichloromethane (TCM), dichloromethane (DCM), trichloroethylene (TCE), vinyl chloride (VC), benzene, and toluene. Soil was sampled at Skellingsted landfill, Denmark. The soil columns showed a high capacity for methane oxidation, with oxidation rates up to 184 g/m 2 /d corresponding to a 77% reduction of inlet methane. Maximal methane oxidation occurred at 15-20 cm depth, in the upper part of the column where there were overlapping gradients of methane and oxygen. All the chlorinated hydrocarbons were degraded in the active soil columns with removal efficiencies higher than 57%. Soil gas concentration profiles indicated that the removal of the fully chlorinated compound TeCM was because of anaerobic degradation, whereas the degradation of lower chlorinated compounds like VC and DCM was located in the upper oxic part of the column. Benzene and toluene were also removed in the active column. This study demonstrates the complexity of landfill soil cover systems and shows that both anaerobic and aerobic bacteria may play an important role in reducing the emission of trace components into the atmosphere.

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Stable isotopic signatures (δ¹³C, δD) of methane from European landfill sites

Abstract: After formation of CH 4 its isotopic signature may be modified by secondary, isotope-fractionating processes. The most important of these processes is aerobic CH 4 oxidation by meth-8251

Cited by 112 publications

References 47 publications

The recent increase of atmospheric methane from 10 years of ground-based NDACC FTIR observations since 2005

The recent increase of atmospheric methane from 10 years of ground-based NDACC FTIR observations since 2005

Improved quantification of microbial CH<sub>4</sub> oxidation efficiency in arctic wetland soils using carbon isotope fractionation

Biodegradation of Trace Gases in Simulated Landfill Soil

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Stable isotopic signatures (δ13C, δD) of methane from European landfill sites

Abstract: After formation of CH 4 its isotopic signature may be modified by secondary, isotope-fractionating processes. The most important of these processes is aerobic CH 4 oxidation by meth-8251

Cited by 112 publications

References 47 publications

The recent increase of atmospheric methane from 10 years of ground-based NDACC FTIR observations since 2005

The recent increase of atmospheric methane from 10 years of ground-based NDACC FTIR observations since 2005

Improved quantification of microbial CH&lt;sub&gt;4&lt;/sub&gt; oxidation efficiency in arctic wetland soils using carbon isotope fractionation

Biodegradation of Trace Gases in Simulated Landfill Soil

Contact Info

Product

Resources

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Stable isotopic signatures (δ¹³C, δD) of methane from European landfill sites

Improved quantification of microbial CH<sub>4</sub> oxidation efficiency in arctic wetland soils using carbon isotope fractionation