Myriam Guillevic

Swiss Federal Laboratories for Materials Science and Technology

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Martin K. Vollmer

Swiss Federal Laboratories for Materials Science and Technology

Stefan Reimann

Swiss Federal Laboratories for Materials Science and Technology

Céline Pascale

Swiss Federal Institute of Metrology

Bernhard Niederhauser

Swiss Federal Institute of Metrology

Matthias Hill

Swiss Federal Laboratories for Materials Science and Technology

Thomas Blunier

University of Copenhagen

Daiana Leuenberger

Swiss Federal Institute of Metrology

Simon A. Wyss

Swiss Federal Laboratories for Materials Science and Technology

Paul Schlauri

Swiss Federal Laboratories for Materials Science and Technology

Lukas Emmenegger

Swiss Federal Laboratories for Materials Science and Technology

Cooperative Institutions

Centre National de la Recherche Scientifique

University of Copenhagen

Laboratoire des Sciences du Climat et de l'Environnement

University of Bern

Swiss Federal Laboratories for Materials Science and Technology

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Oeschger Centre for Climate Change Research

Université de Versailles Saint-Quentin-en-Yvelines

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

CEA Paris-Saclay

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Atmospheric Histories and Emissions of Chlorofluorocarbons CFC-13(CClF[subscript 3]), ΣCFC-114 (C[subscript 2]Cl[subscript 2]F[subscript 4]), and CFC-115 (C[subscript 2]ClF[subscript 5]

Martin K. Vollmer Dickon Young Cathy M. Trudinger Jens Mühle Stephan Henne

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SI-traceable and dynamic reference gas mixtures for water vapour at polar and high troposphere atmospheric levels

EGUGA (2017)

Myriam Guillevic Céline Pascale D. Mutter Sascha Wettstein Bernhard Niederhauser

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A combustion setup to precisely reference δ13C and δ2H isotope ratios of pure CH4 to produce isotope reference gases of δ13C-CH4 in synthetic air

Peter Sperlich Myriam Guillevic Christo Buizert Theo M. Jenk Célia Sapart

Abstract. Isotope records of atmospheric CH4 can be used to infer changes in the biochemistry of CH4. One factor limiting quantitative estimates of changes in the biogeochemistry of CH4 are the uncertainties of the isotope measurements due to the lack of a unique isotope reference gas, certified for δ13C-CH4 or δ2H-CH4. We present a method to produce isotope reference gases for CH4 in synthetic airs that are precisely anchored to the VPDB and VSMOW scale and contain δ13C-CH4 values typical for the modern and glacial atmosphere. We quantitatively combusted two pure CH4 gases from fossil and biogenic sources and determined the δ13C and δ2H values of the produced CO2 and H2O relative to the VPDB and VSMOW scale within a very small analytical uncertainty of 0.04‰ and 0.7‰, respectively. We found isotope ratios of −39.56‰ and −56.37‰ for δ13C and −170.1‰ and −317.4‰ for δ2H in the fossil and biogenic CH4, respectively. We used both CH4 types as parental gases from which we mixed two filial CH4 gases. Their δ13C was determined to be −42.21‰ and −47.25‰, representing glacial and present atmospheric δ13C-CH4. The δ2H isotope ratios of the filial CH4 gases were found with −193.1‰ and −237.1‰, respectively. Next, we mixed aliquots of the filial CH4 gases with ultrapure N2/O2 (CH4 &leq; 2 ppb) producing two isotope reference gases of synthetic air with CH4 mixing ratios near atmospheric values. We show that our method is reproducible and does not introduce isotopic fractionation for δ13C within the uncertainties of our detection limit (we cannot conclude this for δ2H because our system is currently not prepared for δ2H-CH4 measurements in air samples). The general principle of our method can be applied to produce synthetic isotope reference gases targeting δ2H-CH4 or other gas species.

Isotopomers

Isotope-ratio mass spectrometry

Kinetic isotope effect

Limiting

10.5194/amtd-5-3499-2012

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Additional file 2 of Automated fragment formula annotation for electron ionisation, high resolution mass spectrometry: application to atmospheric measurements of halocarbons

Figshare (2021)

Myriam Guillevic Aurore Guillevic Martin K. Vollmer Paul Schlauri Matthias Hill

Additional file 2. Zip file containing all input mass spectral data for ALPINAC, for the training and validation sets. There is one text file per compound.

Accelerator mass spectrometry

Fragment (logic)

10.6084/m9.figshare.16735693

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Additional file 3 of Automated fragment formula annotation for electron ionisation, high resolution mass spectrometry: application to atmospheric measurements of halocarbons

Figshare (2021)

Myriam Guillevic Aurore Guillevic Martin K. Vollmer Paul Schlauri Matthias Hill

Additional file 3. Zip file containing all output formulae produced by ALPINAC, for the training and validation sets, using the default settings. There is one text file per compound.

Fragment (logic)

10.6084/m9.figshare.16735696

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Unexpected nascent atmospheric emissions of three ozone-depleting hydrochlorofluorocarbons

Zenodo (CERN European Organization for Nuclear Research) (2020)

Martin K. Vollmer Jens Mühle Stephan Henne Dickon Young Matthew Rigby

Ozone Depletion

10.5281/zenodo.4266485

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Heinrich Stadial 4: sequence of events from North to South seen in high resolution Greenland and Antarctic ice cores and suggestion of synchronization to North Atlantic marine records

EGU General Assembly Conference Abstracts (2013)

Myriam Guillevic Lucie Bazin C. Stowasser Amaëlle Landais Valérie Masson‐Delmotte

Stadial

Ice core

Gulf Stream

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A first chronology for the NEEM ice core

Sune Olander Rasmussen Peter M Abbott Thomas Blunier Anna J. Bourne Edward J. Brook

Abstract. A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring the annual layer counted Greenland Ice Core Chronology 2005 (GICC05) from the NGRIP core to the NEEM core using 787 match points of mainly volcanic origin identified in the Electrical Conductivity Measurement (ECM) and Dielectrical Profiling (DEP) records. Tephra horizons found in both the NEEM and NGRIP ice cores are used to test the matching based on ECM and DEP and provide additional horizons used for the time scale transfer. A thinning function reflecting the accumulated strain along the core has been determined using a Dansgaard–Johnsen flow model and an isotope-dependent accumulation rate parameterization. Flow parameters are determined from Monte Carlo analysis constrained by the observed depth-age horizons. In order to construct a chronology for the gas phase, the ice age–gas age difference (Δage) has been reconstructed using a coupled firn densification–heat diffusion model. Temperature and accumulation inputs to the Δage model, initially derived from the water isotope proxies, have been adjusted to optimize the fit to timing constraints from δ15N of nitrogen and high-resolution methane data during the abrupt onsets of interstadials. The ice and gas chronologies and the corresponding thinning function represent the first chronology for the NEEM core, and based on both the flow and firn modelling results, the accumulation history for the NEEM site has been reconstructed, providing the necessary basis for further analysis of the records from NEEM.

Chronology

Ice core

Firn

Stadial

10.5194/cpd-9-2967-2013

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Citations (14)

Supplementary material to "Dynamic-gravimetric preparation of metrologically traceable primary calibration standards for halogenated greenhouse gases"

Myriam Guillevic Martin K. Vollmer Simon A. Wyss Daiana Leuenberger Andreas Ackermann

S1 Determination of mass loss rate of permeation devicesThe mass loss q m in ng/min due to permeation through the membrane of the permeation device is calculated using a linear fit based on multiple data of mass and time as measured by our magnetic suspension balance.This linear fit gives directly q m and

Gravimetric analysis

Primary (astronomy)

10.5194/amt-2018-30-supplement

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Spatial gradients of temperature, accumulation and δ18O-ice in Greenland over a series of Dansgaard-Oeschger events

Myriam Guillevic Lucie Bazin Amaëlle Landais P. Kindler Anaïs Orsi

Abstract. Air and water stable isotope measurements from three Greenland deep ice cores (GISP2, NGRIP and NEEM) are investigated over a series of Dansgaard-Oeschger events (DO 8-9-10) which are representative of glacial millennial scale variability. Combined with firn modeling, air isotope data allow to quantify abrupt temperature increases for each drill site. Our data show that the magnitude of stadial-interstadial temperature increase is up to 3 °C larger in Central and North Greenland than in North West Greenland. The temporal water isotope (δ18O) – temperature relationship varies between 0.3 and 0.6 ± 0.08‰ °C−1 and is systematically larger at NEEM, possibly due to limited changes in precipitation seasonality compared to GISP2 or NGRIP. The gas age-ice age difference of warming events represented in water and air isotopes can only be modeled when assuming a 26% (NGRIP) to 34% (NEEM) lower accumulation than derived from a Dansgaard-Johnsen ice flow model.

Stadial

Ice core

Meltwater

10.5194/cpd-8-5209-2012

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Citations (4)