Title

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

Publication Name

Atmospheric Measurement Techniques

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.

Open Access Status

This publication may be available as open access

Volume

14

Issue

5

First Page

3469

Last Page

3479

Funding Sponsor

Australian Government

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Link to publisher version (DOI)

http://dx.doi.org/10.5194/amt-14-3469-2021