Journal article

On-farm beef cattle methane emissions measured with tracer-ratio and inverse-dispersion modelling techniques

Mei Bai, José I Velazco, Trevor W Coates, Frances A Phillips, Thomas K Flesch, Julian Hill, David G Mayer, Nigel W Tomkins, Roger S Hegarty, Deli Chen

Copernicus GmbH

Abstract

Abstract. The development and validation of management practices to mitigate greenhouse gas (GHG) emissions from livestock requires accurate emission measurements. This study assessed the accuracy of a practical inverse dispersion (IDM) micrometeorological technique to quantify methane (CH4) emitted from a small cattle herd (16 animals) confined to a 63 × 60 m pen. The IDM technique calculates emissions from the increase in CH4 concentration measured downwind of the animals. Two types of open-path (OP) gas sensors were used to measure concentration in the IDM calculation: a Fourier transform infrared spectrometer (IDM-FTIR) or a CH4 Laser (IDM-Laser). The actual cattle emission rate was give..

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