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Title: CH4 emission estimates from an active landfill site inferred from a combined approach of CFD modelling and in situ FTIR measurements
Authors: Sonderfeld, Hannah
Bösch, Hartmut
Jeanjean, Antoine P. R.
Riddick, Stuart N.
Allen, Grant
Ars, Sébastien
Davies, Stewart
Harris, Neil
Humpage, Neil
Leigh, Roland
Pitt, Joseph
First Published: 25-Oct-2017
Publisher: European Geosciences Union (EGU), Copernicus Publications
Citation: Atmospheric Measurement Techniques, 2017, 10, pp. 3931-3946
Abstract: Globally, the waste sector contributes to nearly a fifth of anthropogenic methane emitted to the atmosphere and is the second largest source of methane in the UK. In recent years great improvements to reduce those emissions have been achieved by the installation of methane recovery systems at landfill sites, and subsequently methane emissions reported in national emission inventories have been reduced. Nevertheless, methane emissions of landfills remain uncertain and quantification of emission fluxes is essential to verify reported emission inventories and to monitor changes in emissions. Here we present a new approach for methane emission quantification from a complex source such as a landfill site by applying a computational fluid dynamics (CFD) model to calibrated in situ measurements of methane as part of a field campaign at a landfill site near Ipswich, UK, in August 2014. The methane distribution for different meteorological scenarios is calculated with the CFD model and compared to methane mole fractions measured by an in situ Fourier-transform infrared (FTIR) spectrometer downwind of the prevailing wind direction. Assuming emissions only from the active site, a mean daytime flux of 0.83 mg m−2 s−1, corresponding to a spatially integrated emission of 53.3 kg h−1, was estimated. The addition of a secondary source area adjacent to the active site, where some methane hotspots were observed, improved the agreement between the simulated and measured methane distribution. As a result, the flux from the active site was reduced slightly to 0.71 mg m−2 s−1 (45.6 kg h−1), and at the same time an additional flux of 0.32 mg m−2 s−1 (30.4 kg h−1) was found from the secondary source area. This highlights the capability of our method to distinguish between different emission areas of the landfill site, which can provide more detailed information about emission source apportionment compared to other methods deriving bulk emissions.
DOI Link: 10.5194/amt-10-3931-2017
ISSN: 1867-1381
eISSN: 1867-8548
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2017. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Description: Data are available upon request from the authors.
Appears in Collections:Published Articles, Dept. of Chemistry

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