Thomas Röckmann
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View article: Global inventory of doubly substituted isotopologues of methane (Δ <sup>13</sup> CH <sub>3</sub> D and Δ <sup>12</sup> CH <sub>2</sub> D <sub>2</sub> )
Global inventory of doubly substituted isotopologues of methane (Δ <sup>13</sup> CH <sub>3</sub> D and Δ <sup>12</sup> CH <sub>2</sub> D <sub>2</sub> ) Open
Measurements of methane (CH4) molecules containing two rare isotopes (13CH3D and 12CH2D2), also termed doubly substituted or “clumped” isotopologues, have the potential to provide two additional isotopic dimensions to help investigate the …
View article: Isotope and chemical alteration of coalbed gases during migration from underground coal mine into the atmosphere
Isotope and chemical alteration of coalbed gases during migration from underground coal mine into the atmosphere Open
View article: Harmonisation of methane isotope ratio measurements from different laboratories using atmospheric samples
Harmonisation of methane isotope ratio measurements from different laboratories using atmospheric samples Open
Establishing interlaboratory compatibility among measurements of stable isotope ratios of atmospheric methane (δ13C-CH4 and δD-CH4) is challenging. Significant offsets are common because laboratories have different ties to the VPDB or SMOW…
View article: Pathway-specific bulk and clumped isotope signatures of methane production in marine sediment incubations
Pathway-specific bulk and clumped isotope signatures of methane production in marine sediment incubations Open
View article: Identification of Sources of Methane in Ho Chi Minh City, Vietnam
Identification of Sources of Methane in Ho Chi Minh City, Vietnam Open
View article: Characterising methane emissions from dairy farm sources using mobile and dual-isotope measurements in Jersey, Channel Islands
Characterising methane emissions from dairy farm sources using mobile and dual-isotope measurements in Jersey, Channel Islands Open
Field campaigns in Jersey, Channel Islands (Crown Dependency of British Isles), were carried out to understand the distribution and scale of agricultural methane (CH4) emissions. We used vehicle-mounted spectrometers and isotope analysis t…
View article: Isotope discrimination of carbonyl sulfide ( <sup>34</sup> S) and carbon dioxide ( <sup>13</sup> C, <sup>18</sup> O) during plant uptake in flow-through chamber experiments
Isotope discrimination of carbonyl sulfide ( <sup>34</sup> S) and carbon dioxide ( <sup>13</sup> C, <sup>18</sup> O) during plant uptake in flow-through chamber experiments Open
Carbonyl sulfide (COS) has been proposed as a proxy for gross primary production (GPP), as it is taken up by plants through a pathway comparable to that of CO2. COS diffuses into the leaf, where it undergoes an essentially one-way reaction…
View article: Observationally-derived Fractional Release Factors, Ozone Depletion Potentials, and Stratospheric Lifetimes of Four Long-Lived CFCs: CFC-13 (CClF <sub>3</sub> ), CFC-114 (C <sub>2</sub> Cl <sub>2</sub> F <sub>4</sub> ), CFC-114a (CF <sub>3</sub> CCl <sub>2</sub> F), and CFC-115 (C <sub>2</sub> ClF <sub>5</sub> )
Observationally-derived Fractional Release Factors, Ozone Depletion Potentials, and Stratospheric Lifetimes of Four Long-Lived CFCs: CFC-13 (CClF <sub>3</sub> ), CFC-114 (C <sub>2</sub> Cl <sub>2</sub> F <sub>4</sub> ), CFC-114a (CF <sub>3</sub> CCl <sub>2</sub> F), and CFC-115 (C <sub>2</sub> ClF <sub>5</sub> ) Open
The longer an Ozone Depleting Substance (ODS) remains in the stratosphere, the longer it will be available for the process of ozone depletion. We present improved policy-relevant parameters: Fractional Release Factors (FRFs), Ozone Depleti…
View article: Tracing Diurnal Variations of Atmospheric CO <sub>2</sub> , O <sub>2</sub> , and δ13 ${\boldsymbol{\delta }}^{\mathbf{13}}$CO <sub>2</sub> Over a Tropical and a Temperate Forest
Tracing Diurnal Variations of Atmospheric CO <sub>2</sub> , O <sub>2</sub> , and δ13 ${\boldsymbol{\delta }}^{\mathbf{13}}$CO <sub>2</sub> Over a Tropical and a Temperate Forest Open
We analyze the diurnal variability of atmospheric , , and CO 2 above the canopies of two contrasting ecosystems: the Amazon tropical forest and the Loobos temperate forest. Using a coupled forest‐atmosphere model constrained by tower‐based…
View article: Measurement report: Isotopic composition of CH <sub>4</sub> emitted from gas exploration sites in the Transylvanian Basin, Romania
Measurement report: Isotopic composition of CH <sub>4</sub> emitted from gas exploration sites in the Transylvanian Basin, Romania Open
Isotope measurements are increasingly used to constrain the methane budget on various scales, from global to regional. The success of isotope-based source attribution depends to a large degree on the knowledge of the isotope signatures of …
View article: Amazon rainforest ecosystem exchange of CO <sub>2</sub> and H <sub>2</sub> O through turbulent understory ejections
Amazon rainforest ecosystem exchange of CO <sub>2</sub> and H <sub>2</sub> O through turbulent understory ejections Open
We investigate the role of short-term variability in the mean ecosystem exchange of carbon dioxide and water vapour. Specifically, we focus on quantifying how the intermittent turbulent exchange at the forest–atmosphere interface – charact…
View article: A dynamic H2 system with multi-source methane in chromitite-rich ophiolitic settings
A dynamic H2 system with multi-source methane in chromitite-rich ophiolitic settings Open
International audience
View article: Methane Sources in Cluj‐Napoca, Romania: Insights From Isotopic Analysis
Methane Sources in Cluj‐Napoca, Romania: Insights From Isotopic Analysis Open
Increased emissions of methane () have contributed 0.3–0.8°C to global temperature rise since preindustrial times. Reducing these emissions is crucial to mitigate climate change. Measurements of the isotopic composition of ( 13 C and 2 H) …
View article: Understanding coalbed gas distribution from longwall mining: Geochemical and isotopic approach
Understanding coalbed gas distribution from longwall mining: Geochemical and isotopic approach Open
View article: Improving consistency in methane emission quantification from the natural gas distribution systems across measurement devices
Improving consistency in methane emission quantification from the natural gas distribution systems across measurement devices Open
Mobile real-time measurements of ambient methane provide a fast and effective method to identify and quantify methane leaks from local gas distribution systems in urban areas. The objectives of these methodologies are to (i) identify leak …
View article: Tracing diurnal variations of atmospheric CO2, O2 and δ13CO2 over a tropical and a temperate forest.
Tracing diurnal variations of atmospheric CO2, O2 and δ13CO2 over a tropical and a temperate forest. Open
View article: Quantifying agricultural N <sub>2</sub> O and CH <sub>4</sub> emissions in the Netherlands using an airborne eddy covariance system
Quantifying agricultural N <sub>2</sub> O and CH <sub>4</sub> emissions in the Netherlands using an airborne eddy covariance system Open
This study reports on the first successful deployment of a new airborne eddy covariance (EC) setup to better characterize and quantify non-CO2 greenhouse gas emissions from agriculture. The system was deployed aboard the DLR research aircr…
View article: In situ production of hybrid N <sub>2</sub> O in dust-rich Antarctic ice
In situ production of hybrid N <sub>2</sub> O in dust-rich Antarctic ice Open
Nitrous oxide (N2O) is a potent greenhouse gas involved in the destruction of stratospheric ozone. Past atmospheric mixing ratios of N2O are archived in ice cores; however, the presence of in situ N2O production in dust-rich Antarctic ice …
View article: Triple oxygen isotope composition of CO <sub>2</sub> in the upper troposphere and stratosphere
Triple oxygen isotope composition of CO <sub>2</sub> in the upper troposphere and stratosphere Open
High-precision measurements of the triple oxygen isotope composition of CO2 (Δ′17O) can be used to estimate biosphere–atmosphere exchange of CO2, the residence time of tropospheric CO2, and stratosphere–troposphere exchange. In this study,…
View article: Global inventory of doubly substituted isotopologues of methane (Δ <sup>13</sup> CH <sub>3</sub> D and Δ <sup>12</sup> CH <sub>2</sub> D <sub>2</sub> )
Global inventory of doubly substituted isotopologues of methane (Δ <sup>13</sup> CH <sub>3</sub> D and Δ <sup>12</sup> CH <sub>2</sub> D <sub>2</sub> ) Open
Measurements of methane (CH4) molecules containing two rare isotopes (13CH3D and 12CH2D2), also termed doubly substituted or ‘clumped’ isotopologues, have the potential to provide two additional isotopic dimensions to help investigating me…
View article: Harmonisation of methane isotope ratio measurements from different laboratories using atmospheric samples
Harmonisation of methane isotope ratio measurements from different laboratories using atmospheric samples Open
Establishing interlaboratory compatibility among measurements of stable isotope ratios of atmospheric methane (δ13C-CH4 and δD-CH4) is challenging. Significant offsets are common because laboratories have different ties to the VPDB or SMOW…
View article: Supplementary material to "Harmonisation of methane isotope ratio measurements from different laboratories using atmospheric samples"
Supplementary material to "Harmonisation of methane isotope ratio measurements from different laboratories using atmospheric samples" Open
View article: Evidence of successful methane mitigation in one of Europe's most important oil production region
Evidence of successful methane mitigation in one of Europe's most important oil production region Open
Reducing methane emissions from the oil and gas production infrastructure is a cost-effective way for limiting global warming. In 2019, a measurement campaign in southern Romania found emission rates from the oil and gas sector substantial…
View article: Correction to “Rapid High-Sensitivity Analysis of Methane Clumped Isotopes (Δ<sup>13</sup>CH<sub>3</sub>D and Δ<sup>12</sup>CH<sub>2</sub>D<sub>2</sub>) Using Mid-Infrared Laser Spectroscopy”
Correction to “Rapid High-Sensitivity Analysis of Methane Clumped Isotopes (Δ<sup>13</sup>CH<sub>3</sub>D and Δ<sup>12</sup>CH<sub>2</sub>D<sub>2</sub>) Using Mid-Infrared Laser Spectroscopy” Open
View article: Comment on egusphere-2024-3572
Comment on egusphere-2024-3572 Open
View article: Atmospheric Methane: Comparison Between Methane's Record in 2006–2022 and During Glacial Terminations
Atmospheric Methane: Comparison Between Methane's Record in 2006–2022 and During Glacial Terminations Open
Atmospheric methane's rapid growth from late 2006 is unprecedented in the observational record. Assessment of atmospheric methane data attributes a large fraction of this atmospheric growth to increased natural emissions over the tropics, …
View article: Isotopic source signatures of stratospheric CO inferred from in situ vertical profiles
Isotopic source signatures of stratospheric CO inferred from in situ vertical profiles Open
View article: Photocatalytic Chlorine Production From Iron Chlorides in Atmospheric Aerosols: Strategies for Quantifying Methane and Tropospheric Ozone Control
Photocatalytic Chlorine Production From Iron Chlorides in Atmospheric Aerosols: Strategies for Quantifying Methane and Tropospheric Ozone Control Open
It was recently discovered that chlorine is produced photocatalytically from mineral dust‐sea spray aerosols, impacting methane and tropospheric ozone, and an evaluation was made of the climate and environmental impact of a chlorine‐based …