A GC-IRMS method for measuring sulfur isotope ratios of carbonyl sulfide from small air samples [version 1; peer review: 2 approved]

Autor: Sophie L. Baartman, Maarten C. Krol, Thomas Röckmann, Shohei Hattori, Kazuki Kamezaki, Naohiro Yoshida, Maria Elena Popa

Publikováno v: Open Research Europe, Vol 1 (2021)

A new system was developed for measuring sulfur isotopes δ33S and δ34S from atmospheric carbonyl sulfide (COS or OCS) on small air samples of several liters, using a pre-concentration and gas chromatography – isotope ratio mass spectrometry (GC-I

Externí odkaz: https://doaj.org/article/0dae36675ae34df5a2e9a7f0f765aa36

Calibration of an optical methane clumped isotope thermometer

Autor: Ivan Prokhorov, Béla Tuzson, Nico Kueter, Malavika Sivan, Maria Elena Popa, Thomas Röckmann, Lukas Emmenegger, Stefano M. Bernasconi, Joachim Mohn

Methane clumped isotope thermometry relies on accurate measurements of relative abundances of the doubly-substituted isotopologues 12CH2D2 and 13CH3D. Calibration of the thermometer requires, regardless of the applied technique, i.e., laser absorptio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f0be4adfbe307f2f90ec7ad00e974907
https://doi.org/10.5194/egusphere-egu23-144

Direct air measurements using the high resolution Thermo Ultra mass spectrometer: O2/N2 and Ar/N2 ratios, and O2, N2 and Ar isotopic composition

Autor: Maria Elena Popa

I will present a newly developed method for analyzing major air components and their isotopic composition, using the high resolution Thermo Ultra mass spectrometer. The main characteristics of this instrument that are interesting in this context are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::94337a45773d353288d6180a03a36d5e
https://doi.org/10.5194/egusphere-egu23-15560

Constraining sources and sinks of subglacial methane from the Greenland ice sheet using clumped isotopes

Autor: Getachew Agmuas Adnew, Moritz Schroll, Sarah Elise Sapper, Thomas Röckmann, Maria Elena Popa, Christian Juncher Jørgensen, Frank Keppler, Carina van der Veen, Malavika Sivan, Thomas Blunier, Jesper Riis Christiansen

Publikováno v: Adnew, G A, Schroll, M, Sapper, S E, Röckmann, T, Popa, M E, Jørgensen, C J, Keppler, F, van der Veen, C, Sivan, M, Blunier, T & Christiansen, J R 2023, ' Constraining sources and sinks of subglacial methane from the Greenland ice sheet using clumped isotopes ', EGU General Assembly 2023, Vienna, Austria, 24/04/2023-28/04/2023 . https://doi.org/10.5194/egusphere-egu23-5518

The subglacial environment under the Greenland Ice Sheet (GrIS) is an active zone of methane (CH4) production and consumption (1). Recent studies have shown that the meltwaters are a net source of CH4 to the atmosphere (2), although its global signif

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::373f5fda53b030fbb2bf56a034b3a6ea
https://curis.ku.dk/ws/files/355678091/Constraining_sources_and_sinks_of_subglacial_methane_from_the_Greenland_ice_sheet_using_clumped_isotopes.pdf

Isotopic characterization of methane: insights from clumped isotope (13CDH3 and CD2H2) measurements

Autor: Malavika Sivan, Thomas Röckmann, Caroline P. Slomp, Carina van der Veen, Maria Elena Popa

Atmospheric methane is an important greenhouse gas, and various methods are used to identify and quantify its sources. The measurement of bulk isotopic composition (δ13C and δD) is a widely used characterization technique, but due to the overlap of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::beaa2463675c6195e234fb9d0572f784
https://doi.org/10.5194/egusphere-egu22-4029