Characterisation of methane sources in Lutjewad, The Netherlands, using quasi-continuous isotopic composition measurements
Despite the importance of methane for climate change mitigation, uncertainties regarding the temporal and spatial variability of the emissions remain. Measurements of CH4 isotopic composition are used to partition the relative contributions of different emission sources. We report continuous isotopi...
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doaj-005c61fced03449d9e279c4c223063592020-12-17T12:50:44ZengTaylor & Francis GroupTellus: Series B, Chemical and Physical Meteorology1600-08892020-01-0172112010.1080/16000889.2020.18237331823733Characterisation of methane sources in Lutjewad, The Netherlands, using quasi-continuous isotopic composition measurementsMalika Menoud0Carina van der Veen1Bert Scheeren2Huilin Chen3Barbara Szénási4Randulph P. Morales5Isabelle Pison6Philippe Bousquet7Dominik Brunner8Thomas Röckmann9Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht UniversityInstitute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht UniversityCentre of Isotope Research, University of GroningenCentre of Isotope Research, University of GroningenLaboratoire des Sciences du Climat et de l’Environnement, Université de Versailles Saint-QuentinSwiss Federal Laboratories for Materials Science and Technology, EmpaLaboratoire des Sciences du Climat et de l’Environnement, Université de Versailles Saint-QuentinLaboratoire des Sciences du Climat et de l’Environnement, Université de Versailles Saint-QuentinSwiss Federal Laboratories for Materials Science and Technology, EmpaInstitute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht UniversityDespite the importance of methane for climate change mitigation, uncertainties regarding the temporal and spatial variability of the emissions remain. Measurements of CH4 isotopic composition are used to partition the relative contributions of different emission sources. We report continuous isotopic measurements during 5 months at the Lutjewad tower (north of the Netherlands). Time-series of χ(CH4), δ13C-CH4, and δD-CH4 in ambient air were analysed using the Keeling plot method. Resulting source signatures ranged from −67.4 to −52.4‰ vs V-PDB and from −372 to −211‰ vs V-SMOW, for δ13C and δD respectively, indicating a prevalence of biogenic sources. Analysis of isotope and wind data indicated that (i) emissions from off-shore oil and gas platforms in the North Sea were not detected during this period, (ii) CH4 from fossil fuel related sources was usually advected from the east, pointing towards the Groningen gas field or regions further east in Germany. The results from two atmospheric transport models, CHIMERE and FLEXPART-COSMO, using the EDGAR v4.3.2 and TNO-MACC III emission inventories, reproduce χ(CH4) variations relatively well, but the isotope signatures were over-estimated by the model compared to the observations. Accounting for geographical variations of the δ13C signatures from fossil fuel emissions improved the model results significantly. The difference between model and measured isotopic signatures was larger when using TNO-MACC III compared to EDGAR v4.3.2 inventory. Uncertainties in the isotope signatures of the sources could explain a significant fraction of the discrepancy, thus a better source characterisation could further strengthen the use of isotopes in constraining emissions.http://dx.doi.org/10.1080/16000889.2020.1823733methaneisotope ratio mass spectrometrysource isotopic signaturesemission inventoriesin-situ measurements |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Malika Menoud Carina van der Veen Bert Scheeren Huilin Chen Barbara Szénási Randulph P. Morales Isabelle Pison Philippe Bousquet Dominik Brunner Thomas Röckmann |
spellingShingle |
Malika Menoud Carina van der Veen Bert Scheeren Huilin Chen Barbara Szénási Randulph P. Morales Isabelle Pison Philippe Bousquet Dominik Brunner Thomas Röckmann Characterisation of methane sources in Lutjewad, The Netherlands, using quasi-continuous isotopic composition measurements Tellus: Series B, Chemical and Physical Meteorology methane isotope ratio mass spectrometry source isotopic signatures emission inventories in-situ measurements |
author_facet |
Malika Menoud Carina van der Veen Bert Scheeren Huilin Chen Barbara Szénási Randulph P. Morales Isabelle Pison Philippe Bousquet Dominik Brunner Thomas Röckmann |
author_sort |
Malika Menoud |
title |
Characterisation of methane sources in Lutjewad, The Netherlands, using quasi-continuous isotopic composition measurements |
title_short |
Characterisation of methane sources in Lutjewad, The Netherlands, using quasi-continuous isotopic composition measurements |
title_full |
Characterisation of methane sources in Lutjewad, The Netherlands, using quasi-continuous isotopic composition measurements |
title_fullStr |
Characterisation of methane sources in Lutjewad, The Netherlands, using quasi-continuous isotopic composition measurements |
title_full_unstemmed |
Characterisation of methane sources in Lutjewad, The Netherlands, using quasi-continuous isotopic composition measurements |
title_sort |
characterisation of methane sources in lutjewad, the netherlands, using quasi-continuous isotopic composition measurements |
publisher |
Taylor & Francis Group |
series |
Tellus: Series B, Chemical and Physical Meteorology |
issn |
1600-0889 |
publishDate |
2020-01-01 |
description |
Despite the importance of methane for climate change mitigation, uncertainties regarding the temporal and spatial variability of the emissions remain. Measurements of CH4 isotopic composition are used to partition the relative contributions of different emission sources. We report continuous isotopic measurements during 5 months at the Lutjewad tower (north of the Netherlands). Time-series of χ(CH4), δ13C-CH4, and δD-CH4 in ambient air were analysed using the Keeling plot method. Resulting source signatures ranged from −67.4 to −52.4‰ vs V-PDB and from −372 to −211‰ vs V-SMOW, for δ13C and δD respectively, indicating a prevalence of biogenic sources. Analysis of isotope and wind data indicated that (i) emissions from off-shore oil and gas platforms in the North Sea were not detected during this period, (ii) CH4 from fossil fuel related sources was usually advected from the east, pointing towards the Groningen gas field or regions further east in Germany. The results from two atmospheric transport models, CHIMERE and FLEXPART-COSMO, using the EDGAR v4.3.2 and TNO-MACC III emission inventories, reproduce χ(CH4) variations relatively well, but the isotope signatures were over-estimated by the model compared to the observations. Accounting for geographical variations of the δ13C signatures from fossil fuel emissions improved the model results significantly. The difference between model and measured isotopic signatures was larger when using TNO-MACC III compared to EDGAR v4.3.2 inventory. Uncertainties in the isotope signatures of the sources could explain a significant fraction of the discrepancy, thus a better source characterisation could further strengthen the use of isotopes in constraining emissions. |
topic |
methane isotope ratio mass spectrometry source isotopic signatures emission inventories in-situ measurements |
url |
http://dx.doi.org/10.1080/16000889.2020.1823733 |
work_keys_str_mv |
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