The D/H content of methane emitted from biomass burning

Snover, A.K.; Quay, Paul D.; Hao, Wei Min

doi:10.1029/1999gb900075

Cited by 53 publications

(65 citation statements)

References 67 publications

(25 reference statements)

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“…In fact, GEM is expected to change in response to sea level or ice sheet extent, but the two parameters remain within a similar range for all glacials and all interstadials considered in this study. One possibility to reconcile the observations is CH 4 emission changes related to changes in biomes and fire regimes, because BB is a CH 4 source strongly enriched in 13 C and D (13,22,65). BB is an ancient and persistent feature throughout the geologic record (113), and there is evidence of net changes in fire regimes as a consequence of the megafauna extinction that was presumably caused by rapid climate changes in combination with human interference in the course of the last glacial (refs.…”

Section: Control Of (Sub-)tropical Wetland and Floodplain Emissions Onmentioning

confidence: 99%

“…Microbially produced CH 4 is depleted in both stable isotopologues ( 13 C and 2 H or D; "light" isotopic sources) compared with the source mix. However, there are two important natural sources relatively enriched in 13 C and D ("heavy" sources): biomass burning (BB), an important and climatically variable process (22)(23)(24)(25)(26), and "geologic" emissions of old methane (GEMs; called GEM by, for example, refs. [27][28][29].…”

mentioning

confidence: 99%

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Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH₄ice core records

Bock

Schmitt

Beck

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Atmospheric methane (CH 4 ) records reconstructed from polar ice cores represent an integrated view on processes predominantly taking place in the terrestrial biogeosphere. Here, we present dual stable isotopic methane records [δ 13 CH 4 and δD(CH 4 )] from four Antarctic ice cores, which provide improved constraints on past changes in natural methane sources. Our isotope data show that tropical wetlands and seasonally inundated floodplains are most likely the controlling sources of atmospheric methane variations for the current and two older interglacials and their preceding glacial maxima. The changes in these sources are steered by variations in temperature, precipitation, and the water table as modulated by insolation, (local) sea level, and monsoon intensity. Based on our δD(CH 4 ) constraint, it seems that geologic emissions of methane may play a steady but only minor role in atmospheric CH 4 changes and that the glacial budget is not dominated by these sources. Superimposed on the glacial/interglacial variations is a marked difference in both isotope records, with systematically higher values during the last 25,000 y compared with older time periods. This shift cannot be explained by climatic changes. Rather, our isotopic methane budget points to a marked increase in fire activity, possibly caused by biome changes and accumulation of fuel related to the late Pleistocene megafauna extinction, which took place in the course of the last glacial.atmosphere | methane | megafauna | ice core | stable isotopes

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Section: Control Of (Sub-)tropical Wetland and Floodplain Emissions Onmentioning

confidence: 99%

mentioning

confidence: 99%

Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH₄ice core records

Bock

Schmitt

Beck

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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“…Many researchers have reported that measurements of stable isotopic compositions of atmospheric CH 4 are useful for constraining the global CH 4 budget (Quay et al 1991(Quay et al , 1999Lowe et al 1994Lowe et al , 1997Lowe et al , 1999Lassey et al 2000Lassey et al , 2007Snover et al 2000;Miller et al 2002;Morimoto et al 2006), identifying local CH 4 sources (Sugawara et al 1996;Bergamaschi et al 1998;Yamada et al 2005;Tarasova et al 2006), and estimating chemical loss processes of CH 4 in the troposphere (Allan et al 2001a(Allan et al , 2001b(Allan et al , 2005(Allan et al , 2007 and in the stratosphere (Sugawara et al 1997;Wang et al 2002;Rice et al 2003;McCarthy et al 2003). However, isotopic measurements of atmospheric CH 4 for use with an o¿ine technique have never been expanded to the extent of concentration measurements because of their laborious procedures and their necessity for large volume of air samples (Quay et al 1991(Quay et al , 1999Lowe et al 1994Lowe et al , 1997Lowe et al , 1999Sugawara et al 1996Sugawara et al , 1997.…”

Section: Introductionmentioning

confidence: 99%

A High-precision Measurement System for Carbon and Hydrogen Isotopic Ratios of Atmospheric Methane and Its Application to Air Samples Collected in the Western Pacific Region

Umezawa

Aoki

Nakazawa

et al. 2009

Journal of the Meteorological Society of Japan

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In order to study temporal and spatial variations of atmospheric CH 4 quantitatively, we originally improved a measurement system for carbon and hydrogen isotopic ratios (d 13 C and dD) of CH 4 to attain high-precision measurements. By analyzing 100 mL aliquots of an ambient air sample, the precision of our system is 0.080 for d 13 C and 2.20 for dD (1s), which are one of the highest precisions reported so far. The system consists mainly of a CH 4 preconcentration device and a continuous-flow gas chromatograph isotope ratio mass spectrometer equipped with a combustion furnace and a pyrolysis furnace for measurements of d 13 C and dD. The preconcentration trap temperature was maintained at À130 G 1 C during collection of CH 4 from the air sample by passing it through the trap, then at À83 G 1 C while remaining air components such as N 2 and O 2 except for CH 4 escaped, and finally at 100 G 1 C for CH 4 elusion. The isotopic values are measured on a mass spectrometer, relative to respective reference gases. For this study, the d 13 C and dD values of the reference gases were calibrated against our primary standards provided by the IAEA: our d 13 C primary standard is NBS18, whereas our dD primary standards are V-SMOW and SLAP. To ensure the long-term stability and reproducibility of our measurement system, a calibrated whole air stored in a high-pressure cylinder, which was called ''test gas,'' was measured at least twice on each day when sample measurements were made. To measure small air samples, such as those extracted from ice cores, we also examined the relation between the sample size and the measured value of d 13 C and dD: gradual enrichment of the d 13 C occurred with decreasing CH 4 content less than 8 nmol whereas no such e¤ect could be seen for the dD. Furthermore, preliminary results of latitudinal distributions of d 13 C and dD were discussed along with CH 4 concentrations obtained by our shipboard air-sampling program.

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“…c Isotopic ratios of CO 2 and CO in standard gases used in this study are the means obtained from the direct measurements by mass spectrometers (Tsunogai et al, 2002;Murayama et al, 2010). Isotopic ratios of standard gas for CH 4 are the representative values of fossil fuel CH 4 (Snover et al, 2000) similar to the measurements of other JFP standard gases by T. Umezawa (personal communication, 2011). Isotopic ratios of standard gas for N 2 O are representative values derived from the measurements of other JFP standard gases by K. Ishijima (personal communication, 2011).…”

Section: Analysis and Its Precisionmentioning

confidence: 82%

Evaluation of a new JMA aircraft flask sampling system and laboratory trace gas analysis system

Tsuboi¹,

Matsueda²,

Sawa³

et al. 2013

Atmos. Meas. Tech.

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We established and evaluated a flask air sampling system on a cargo C-130H aircraft, as well as a trace gas measurement system for the flask samples, as part of a new operational monitoring program of the Japan Meteorological Agency (JMA). Air samples were collected during each flight, between Kanagawa Prefecture (near Tokyo) and Minamitorishima (an island located nearly 2000 km southeast of Tokyo), from the air-conditioning system on the aircraft. Prior to the operational employment of the sampling system, a quality assurance test of the sampled air was made by specially coordinated flights at a low altitude of 1000 ft over Minamitorishima and comparing the flask values with those obtained at the surface. Based on our storage tests, the flask samples remained nearly stable until analyses. The trace gas measurement system has, in addition to the nondispersive infrared (NDIR) and vacuum ultraviolet resonance fluorescence (VURF) analyzers, two laser-based analyzers using wavelength-scanned cavity ring-down spectroscopy (WS-CRDS) and off-axis integrated cavity output spectroscopy (ICOS). Laboratory tests of the laser-based analyzers for measuring flask samples indicated relatively high reproducibility with overall precisions of less than ±0.06 ppm for CO₂, ±0.68 ppb for CH₄, ±0.36 ppb for CO, and ±0.03 ppb for N₂O. Flask air sample measurements, conducted concurrently on different analyzers were compared. These comparisons showed a negligible bias in the averaged measurements between the laser-based measurement techniques and the other methods currently in use. We also estimated that there are no significant isotope effects for CH₄, CO and N₂O using standard gases with industrial isotopic compositions to calibrate the laser-based analyzers, but CO₂ was found to possess isotope effects larger than its analytical precision

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The D/H content of methane emitted from biomass burning

Cited by 53 publications

References 67 publications

Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH₄ice core records

Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH₄ice core records

A High-precision Measurement System for Carbon and Hydrogen Isotopic Ratios of Atmospheric Methane and Its Application to Air Samples Collected in the Western Pacific Region

Evaluation of a new JMA aircraft flask sampling system and laboratory trace gas analysis system

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The D/H content of methane emitted from biomass burning

Cited by 53 publications

References 67 publications

Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH4ice core records

Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH4ice core records

A High-precision Measurement System for Carbon and Hydrogen Isotopic Ratios of Atmospheric Methane and Its Application to Air Samples Collected in the Western Pacific Region

Evaluation of a new JMA aircraft flask sampling system and laboratory trace gas analysis system

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Product

Resources

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Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH₄ice core records

Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH₄ice core records