In situ quantification of CH4 bubbling events from a peat soil using a new infrared laser spectrometer

Gogo, Sébastien; Guimbaud, Christophe; Laggoun‐Défarge, Fatima; Catoire, Valéry; Robert, Claude

doi:10.1007/s11368-011-0338-3

Cited by 18 publications

(20 citation statements)

References 27 publications

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“…At the two DFE sites, CO 2 effluxes were of similar magnitude; however, substantial differences were observed in the magnitude of CH 4 effluxes ( Table 2). At both sites the occurrence of CH 4 effluxes was closely tied to soil conditions and contaminant availability (i.e., locations of high moisture content where DFE pooled and was not excavated; Figures 4, 5), suggesting that the occurrence of CH 4 effluxes is related to specific conditions rather than only fuel type, consistent with the measurement of CH 4 effluxes in natural wetland and bog environments (Gogo et al 2011). Comparison of emission rates between the two field sites showed that CH 4 effluxes at the Cambria site were an order of magnitude greater than those measured at the Balaton site, pointing to rapid DFE degradation at the Cambria site.…”

Section: Results and Discussion Composition And Magnitude Of Gas Emissupporting

confidence: 72%

Comparison of Source Zone Natural Attenuation Rates At Crude Oil and Ethanol–Blended Fuel Release Sites

Sihota

Mayer

2015

Bioremediation Journal

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Understanding differences in source zone natural attenuation (SZNA) rates occurring among field sites impacted by the same contaminant and across field sites impacted by different contaminants is critical for developing management strategies. For example, unique site conditions can favor or inhibit biodegradation, whereas differences between contaminants can lead to variations in biodegradation potential. However, the implications of these effects for real-world release scenarios remain ambiguous. To better understand the implications of these effects, the authors investigated differences in SZNA rates at two crude oil and two denatured fuel-grade ethanol (DFE) spill sites using on-site measurements of surficial gas effluxes. At the crude oil sites, CH 4 effluxes were below detection, whereas CH 4 effluxes occurred at both DFE sites. Similarly, SZNA rates among sites impacted by the same contaminant were comparable, whereas order of magnitude differences existed between sites impacted by crude oil or DFE. At DFE sites, results also revealed source zone expansion in relation to the initial mass in place, suggesting that extended spatial monitoring may be required to characterize risk potential. Overall, key differences between crude oil and DFE release sites demonstrated the importance of site-specific interactions between hydrogeology and contaminant composition for mediating gas emissions and SZNA rates, and modulating gas transport regimes under field conditions.

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Section: Results and Discussion Composition And Magnitude Of Gas Emissupporting

confidence: 72%

Comparison of Source Zone Natural Attenuation Rates At Crude Oil and Ethanol–Blended Fuel Release Sites

Sihota

Mayer

2015

Bioremediation Journal

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“…Because of relatively high amounts of submerged vegetation (peak biomass density 0.43 kg m −2 ) [ Gu et al , ], Dongtaihu Bay and the East Zone, the two shallow water zones bear some resemblance to wetland ecosystems. In wetlands, ebullition emission comprises only 13 to 48% of the total CH 4 flux [ Gogo et al , ; Maeck et al , ; Crawford et al , ]. However, the difference in the ebullition contribution between MLW and BFG is not statistically significant ( p = 0.20).…”

Section: Discussionmentioning

confidence: 99%

Spatial variations of methane emission in a large shallow eutrophic lake in subtropical climate

Xiao

Zhang

et al. 2017

J. Geophys. Res. Biogeosci.

131

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Subtropical lakes are important source of atmospheric methane (CH4). This study aims to investigate spatial variations of CH4 flux in Lake Taihu, a large (area 2400 km2) and shallow (mean depth 1.9 m) eutrophic lake in Eastern China. The lake exhibited high spatial variations in pollution level, macrophyte vegetation abundance, and algal growth. We measured the diffusion CH4 flux via the transfer coefficient method across the whole lake. In addition, data obtained with the flux gradient and the eddy covariance methods were used in conjunction with the data on the diffusion flux to estimate the contribution by ebullition. Results from 3 years' measurements indicated high spatial variabilities in the diffusion CH4 flux. The spatial pattern of the diffusion CH4 emission was correlated with water clarity, dissolved oxygen concentration, and the spatial distributions of algal and submerged vegetation. In comparison to the transfer coefficient method, the eddy covariance and the flux gradient method observed a lake CH4 flux that was 3.39 ± 0.58 (mean ± 1 standard deviation) and 1.95 ± 0.36 times higher in an open‐water eutrophic zone and in a habitat of submerged macrophytes, respectively. The result implied an average of 71% and 49% ebullition contribution to the total CH4 flux in the two zones. The annual mean diffusion CH4 flux of the whole lake was 0.54 ± 0.30 g m−2 yr−1. Our CH4 emission data suggest that the average CH4 emission reported previously for lakes in Eastern China was overestimated.

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“…The instrument description and method for CH 4 and N 2 O concentration retrieval are reported in Guimbaud et al (2011). SPIRIT has demonstrated high precision for CH 4 and N 2 O mixing ratio measurement in ambient air (0.2% for 1.5 sec of integration time, namely ∼ 4 ppb for CH 4 at 1.9 ppmV and ∼ 0.6 ppb for N 2 O at 320 ppbV) as well as for flux emission measurements above peatlands, lakes, and cultivated fields, using the closed chamber method (Guimbaud et al, 2011;Gogo et al, 2011).…”

Section: Instrument Descriptionmentioning

confidence: 99%

A quantum cascade laser infrared spectrometer for CO2 stable isotope analysis: Field implementation at a hydrocarbon contaminated site under bio-remediation

Guimbaud

Noël

Chartier

et al. 2016

Journal of Environmental Sciences

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Real-time methods to monitor stable isotope ratios of CO2 are needed to identify biogeochemical origins of CO2 emissions from the soil-air interface. An isotope ratio infra-red spectrometer (IRIS) has been developed to measure CO2 mixing ratio with δ(13)C isotopic signature, in addition to mixing ratios of other greenhouse gases (CH4, N2O). The original aspects of the instrument as well as its precision and accuracy for the determination of the isotopic signature δ(13)C of CO2 are discussed. A first application to biodegradation of hydrocarbons is presented, tested on a hydrocarbon contaminated site under aerobic bio-treatment. CO2 flux measurements using closed chamber method is combined with the determination of the isotopic signature δ(13)C of the CO2 emission to propose a non-intrusive method to monitor in situ biodegradation of hydrocarbons. In the contaminated area, high CO2 emissions have been measured with an isotopic signature δ(13)C suggesting that CO2 comes from petroleum hydrocarbon biodegradation. This first field implementation shows that rapid and accurate measurement of isotopic signature of CO2 emissions is particularly useful in assessing the contribution of contaminant degradation to the measured CO2 efflux and is promising as a monitoring tool for aerobic bio-treatment.

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In situ quantification of CH4 bubbling events from a peat soil using a new infrared laser spectrometer

Cited by 18 publications

References 27 publications

Comparison of Source Zone Natural Attenuation Rates At Crude Oil and Ethanol–Blended Fuel Release Sites

Comparison of Source Zone Natural Attenuation Rates At Crude Oil and Ethanol–Blended Fuel Release Sites

Spatial variations of methane emission in a large shallow eutrophic lake in subtropical climate

A quantum cascade laser infrared spectrometer for CO2 stable isotope analysis: Field implementation at a hydrocarbon contaminated site under bio-remediation

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