Isaac Vimont
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View article: Increasing emissions of HCFC-123 and HCFC-124 may be due to leakage during HFC-125 production
Increasing emissions of HCFC-123 and HCFC-124 may be due to leakage during HFC-125 production Open
Hydrochlorofluorocarbons (HCFCs) are ozone-depleting substances whose production and consumption have been phased out under the Montreal Protocol in non-Article 5 (mainly developed) countries and are currently being phased out in the rest …
View article: Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland
Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland Open
Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies of the past oxidative capacity of the atmosphere as well as for reconstructing the past cosmic ray flux. The 14CO abundance in glacial ice re…
View article: A decrease in radiative forcing and equivalent effective chlorine from hydrochlorofluorocarbons
A decrease in radiative forcing and equivalent effective chlorine from hydrochlorofluorocarbons Open
The Montreal Protocol and its successive amendments have been successful in curbing emissions of ozone-depleting substances and potent greenhouse gases via production/consumption controls. Here we show that the radiative forcing and equiva…
View article: California dominates U.S. emissions of the pesticide and potent greenhouse gas sulfuryl fluoride
California dominates U.S. emissions of the pesticide and potent greenhouse gas sulfuryl fluoride Open
Sulfuryl fluoride (SO 2 F 2 ) is a synthetic pesticide and a potent greenhouse gas that is accumulating in the global atmosphere. Rising emissions are a concern since SO 2 F 2 has a relatively long atmospheric lifetime and a high global wa…
View article: Making atmospheric measurements of difficult-to-separate isomers of CFCs routine: a case study of CFC-113 and CFC-113a that refines our understanding of recent atmospheric changes for both of these chemicals.
Making atmospheric measurements of difficult-to-separate isomers of CFCs routine: a case study of CFC-113 and CFC-113a that refines our understanding of recent atmospheric changes for both of these chemicals. Open
Ethane-based chlorofluorocarbons and hydrochlorofluorocarbons can have multiple isomers that are difficult to separate using gas chromatography with detection by electron capture (GC-ECD) or even mass spectrometry (GC-MS). Examples include…
View article: Estimation of the atmospheric hydroxyl radical oxidative capacity using multiple hydrofluorocarbons (HFCs)
Estimation of the atmospheric hydroxyl radical oxidative capacity using multiple hydrofluorocarbons (HFCs) Open
The hydroxyl radical (OH) largely determines the atmosphere's oxidative capacity and, thus, the lifetimes of numerous trace gases, including methane (CH4). Hitherto, observation-based approaches for estimating the atmospheric oxidative cap…
View article: Comment on tc-2023-121
Comment on tc-2023-121 Open
Abstract. Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies of the past oxidative capacity of the atmosphere as well as for reconstructing the past cosmic ray flux. 14CO abundance in glacial …
View article: Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland
Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland Open
Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies of the past oxidative capacity of the atmosphere as well as for reconstructing the past cosmic ray flux. 14CO abundance in glacial ice repres…
View article: Supplementary material to "Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland"
Supplementary material to "Characterization of in situ cosmogenic <sup>14</sup> CO production, retention and loss in firn and shallow ice at Summit, Greenland" Open
Supplement for "Characterization of in situ cosmogenic 14 CO production, retention and loss in firn and shallow ice at Summit, Greenland" by Hmiel et al.Table S1: Measurements and associated corrections for Summit 2013 firn air samples.5Al…
View article: Intercomparison of Atmospheric Carbonyl Sulfide (TransCom‐COS): 2. Evaluation of Optimized Fluxes Using Ground‐Based and Aircraft Observations
Intercomparison of Atmospheric Carbonyl Sulfide (TransCom‐COS): 2. Evaluation of Optimized Fluxes Using Ground‐Based and Aircraft Observations Open
We present a comparison of atmospheric transport models that simulate carbonyl sulfide (COS). This is part II of the ongoing Atmospheric Transport Model Inter‐comparison Project (TransCom–COS). Differently from part I, we focus on seven mo…
View article: Supplementary material to "Estimation of the atmospheric hydroxyl radical oxidative capacity using multiple hydrofluorocarbons (HFCs)"
Supplementary material to "Estimation of the atmospheric hydroxyl radical oxidative capacity using multiple hydrofluorocarbons (HFCs)" Open
Table S2: Sites used for the calculation of the mean for each latitudinal band.The species HFC-134a, HFC-152a, HFC-365mfc and HFC-32 are measured at all sites, but HFC-245fa is only measured at AGAGE sites.Note that the additional sites in…
View article: Estimation of the atmospheric hydroxyl radical oxidative capacity using multiple hydrofluorocarbons (HFCs)
Estimation of the atmospheric hydroxyl radical oxidative capacity using multiple hydrofluorocarbons (HFCs) Open
The hydroxyl radical (OH) largely determines the atmosphere’s oxidative capacity and, thus, the lifetimes of numerous trace gases, including methane (CH4). Hitherto, observation-based approaches for estimating the atmospheric oxidative cap…
View article: Intercomparison of atmospheric carbonyl sulfide (TransCom-COS; Part Two): Evaluation of optimized fluxes using ground-based and aircraft observations
Intercomparison of atmospheric carbonyl sulfide (TransCom-COS; Part Two): Evaluation of optimized fluxes using ground-based and aircraft observations Open
We present a comparison of atmospheric transport models that simulate carbonyl sulfide (COS). This is part II of the ongoing Atmospheric Transport Model (ATM) Inter-comparison Project (TransCom–COS). Differently from part I, we focus on se…
View article: Intercomparison of Atmospheric Carbonyl Sulfide (TransCom‐COS; Part One): Evaluating the Impact of Transport and Emissions on Tropospheric Variability Using Ground‐Based and Aircraft Data
Intercomparison of Atmospheric Carbonyl Sulfide (TransCom‐COS; Part One): Evaluating the Impact of Transport and Emissions on Tropospheric Variability Using Ground‐Based and Aircraft Data Open
We present a comparison of atmospheric transport model (ATM) simulations for carbonyl sulfide (COS), within the framework of the atmospheric tracer transport model intercomparison project “TransCom‐COS.” Seven ATMs participated in the expe…
View article: Global emissions of five controlled CFCs have increased since 2
Global emissions of five controlled CFCs have increased since 2 Open
Production and consumption of ozone-depleting chlorofluorocarbons (CFCs) are controlled under the Montreal Protocol. CFC production for most applications was banned globally in 2010, albeit with exemptions for uses assumed to cause negligi…
View article: Making best use of atmosphere- and inventory-based approaches for quantifying and understanding emissions of greenhouse gases and ozone-depleting substances on a range of spatial scales.
Making best use of atmosphere- and inventory-based approaches for quantifying and understanding emissions of greenhouse gases and ozone-depleting substances on a range of spatial scales. Open
The likelihood for successful emission control and mitigation efforts of trace gases having adverse environmental effects can be enhanced by using a multi-faceted framework for quantifying and understanding emissions. While bottom-up activ…
View article: Using ice core measurements from Taylor Glacier, Antarctica, to calibrate in situ cosmogenic <sup>14</sup> C production rates by muons
Using ice core measurements from Taylor Glacier, Antarctica, to calibrate in situ cosmogenic <sup>14</sup> C production rates by muons Open
Cosmic rays entering the Earth's atmosphere produce showers of secondary particles such as protons, neutrons, and muons. The interaction of these particles with oxygen-16 (16O) in minerals such as ice and quartz can produce carbon-14 (14C)…
View article: A renewed rise in global HCFC-141b emissions between 2017–2021
A renewed rise in global HCFC-141b emissions between 2017–2021 Open
Global emissions of the ozone-depleting gas HCFC-141b (1,1-dichloro-1-fluoroethane, CH3CCl2F) derived from measurements of atmospheric mole fractions increased between 2017 and 2021 despite a fall in reported production and consumption of …
View article: Hydrocarbon Tracers Suggest Methane Emissions from Fossil Sources Occur Predominately Before Gas Processing and That Petroleum Plays Are a Significant Source
Hydrocarbon Tracers Suggest Methane Emissions from Fossil Sources Occur Predominately Before Gas Processing and That Petroleum Plays Are a Significant Source Open
We use global airborne observations of propane (C3H8) and ethane (C2H6) from the Atmospheric Tomography (ATom) and HIAPER Pole-to-Pole Observations (HIPPO), as well as U.S.-based aircraft and tower observations by NOAA and from the NCAR FR…
View article: Comment on acp-2022-298
Comment on acp-2022-298 Open
Abstract. Global emissions of the ozone-depleting gas HCFC-141b (1,1-dichloro-1-fluoroethane, CH3CCl2F) derived from measurements of atmospheric mole fractions increased between 2017 and 2021 despite a fall in reported production and consu…
View article: Comment on acp-2022-298
Comment on acp-2022-298 Open
Abstract. Global emissions of the ozone-depleting gas HCFC-141b (1,1-dichloro-1-fluoroethane, CH3CCl2F) derived from measurements of atmospheric mole fractions increased between 2017 and 2021 despite a fall in reported production and consu…
View article: Projections of hydrofluorocarbon (HFC) emissions and the resulting global warming based on recent trends in observed abundances and current policies
Projections of hydrofluorocarbon (HFC) emissions and the resulting global warming based on recent trends in observed abundances and current policies Open
The emissions of hydrofluorocarbons (HFCs) have increased significantly in the past 2 decades, primarily as a result of the phaseout of ozone-depleting substances under the Montreal Protocol and the use of HFCs as their replacements. In 20…
View article: A renewed rise in global HCFC-141b emissions between 2017–2021
A renewed rise in global HCFC-141b emissions between 2017–2021 Open
Global emissions of the ozone depleting gas 1,1-dichloro-1-fluoroethane (HCFC-141b, CH3CCl2F), derived from measurements of atmospheric mole fractions, have been rising between 2017–2021 despite a fall in reported production and consumptio…
View article: Comment on acp-2021-1070
Comment on acp-2021-1070 Open
Abstract. The emissions of hydrofluorocarbons (HFCs) have increased significantly in the past 2Â decades, primarily as a result of the phaseout of ozone-depleting substances under the Montreal Protocol and the use of HFCs as their replacem…