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Beef cattle methane emissions measured with tracer-ratio and inverse dispersion modelling techniques

Journal Article


Abstract


  • The development and validation of management practices to mitigate greenhouse gas (GHG) emissions from livestock require accurate emission measurements. This study assessed the accuracy of a practical inverse dispersion modelling (IDM) technique to quantify methane (CH4) emitted from a small cattle herd (16 animals) confined to a 63m60m experimental pen. The IDM technique calculates emissions from the increase in the CH4 concentration measured downwind of the animals. The measurements were conducted for 7 d. 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 measured with a tracer-ratio technique using nitrous oxide (N2O) as the tracer gas. We found very good agreement between the two IDM emission estimates (308.12.1-meanSE-And 304.48.0 gCH4 head1 d1 for the IDM-FTIR and IDM-Laser respectively) and the tracer-ratio measurements (301.91.5 gCH4 head1 d1). This study suggests that a practical IDM measurement approach can provide an accurate method of estimating cattle emissions.

Publication Date


  • 2021

Citation


  • Bai, M., Velazco, J. I., Coates, T. W., Phillips, F. A., Flesch, T. K., Hill, J., . . . Chen, D. (2021). Beef cattle methane emissions measured with tracer-ratio and inverse dispersion modelling techniques. Atmospheric Measurement Techniques, 14(5), 3469-3479. doi:10.5194/amt-14-3469-2021

Scopus Eid


  • 2-s2.0-85105826328

Start Page


  • 3469

End Page


  • 3479

Volume


  • 14

Issue


  • 5

Abstract


  • The development and validation of management practices to mitigate greenhouse gas (GHG) emissions from livestock require accurate emission measurements. This study assessed the accuracy of a practical inverse dispersion modelling (IDM) technique to quantify methane (CH4) emitted from a small cattle herd (16 animals) confined to a 63m60m experimental pen. The IDM technique calculates emissions from the increase in the CH4 concentration measured downwind of the animals. The measurements were conducted for 7 d. 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 measured with a tracer-ratio technique using nitrous oxide (N2O) as the tracer gas. We found very good agreement between the two IDM emission estimates (308.12.1-meanSE-And 304.48.0 gCH4 head1 d1 for the IDM-FTIR and IDM-Laser respectively) and the tracer-ratio measurements (301.91.5 gCH4 head1 d1). This study suggests that a practical IDM measurement approach can provide an accurate method of estimating cattle emissions.

Publication Date


  • 2021

Citation


  • Bai, M., Velazco, J. I., Coates, T. W., Phillips, F. A., Flesch, T. K., Hill, J., . . . Chen, D. (2021). Beef cattle methane emissions measured with tracer-ratio and inverse dispersion modelling techniques. Atmospheric Measurement Techniques, 14(5), 3469-3479. doi:10.5194/amt-14-3469-2021

Scopus Eid


  • 2-s2.0-85105826328

Start Page


  • 3469

End Page


  • 3479

Volume


  • 14

Issue


  • 5