Articles | Volume 17, issue 20
https://doi.org/10.5194/amt-17-6107-2024
https://doi.org/10.5194/amt-17-6107-2024
Research article
 | 
18 Oct 2024
Research article |  | 18 Oct 2024

Using open-path dual-comb spectroscopy to monitor methane emissions from simulated grazing cattle

Chinthaka Weerasekara, Lindsay C. Morris, Nathan A. Malarich, Fabrizio R. Giorgetta, Daniel I. Herman, Kevin C. Cossel, Nathan R. Newbury, Clenton E. Owensby, Stephen M. Welch, Cosmin Blaga, Brett D. DePaola, Ian Coddington, Brian R. Washburn, and Eduardo A. Santos

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Cited articles

Alden, C. B., Coburn, S. C., Wright, R. J., Baumann, E., Cossel, K., Perez, E., Hoenig, E., Prasad, K., Coddington, I., and Rieker, G. B.: Single-Blind Quantification of Natural Gas Leaks from 1 km Distance Using Frequency Combs, Environ. Sci. Technol., 53, 2908–2917, https://doi.org/10.1021/acs.est.8b06259, 2019. 
Alemu, A. W., Janzen, H., Little, S., Hao, X., Thompson, D. J., Baron, V., Iwaasa, A., Beauchemin, K. A., and Kröbel, R.: Assessment of grazing management on farm greenhouse gas intensity of beef production systems in the Canadian Prairies using life cycle assessment, Agr. Syst., 158, 1–13, https://doi.org/10.1016/j.agsy.2017.08.003, 2017. 
Bai, M., Loh, Z., Griffith, D. W. T., Turner, D., Eckard, R., Edis, R., Denmead, O. T., Bryant, G. W., Paton-Walsh, C., Tonini, M., McGinn, S. M., and Chen, D.: Performance of open-path lasers and Fourier transform infrared spectroscopic systems in agriculture emissions research, Atmos. Meas. Tech., 15, 3593–3610, https://doi.org/10.5194/amt-15-3593-2022, 2022. 
Coates, T. W., Flesch, T. K., McGinn, S. M., Charmley, E., and Chen, D.: Evaluating an eddy covariance technique to estimate point-source emissions and its potential application to grazing cattle, Agr. Forest Meteorol., 234, 164–171, 2017. 
Coburn, S., Alden, C. B., Wright, R., Cossel, K., Baumann, E., Truong, G.-W., Giorgetta, F., Sweeney, C., Newbury, N. R., Prasad, K., Coddington, I., and Rieker, G. B.: Regional trace-gas source attribution using a field-deployed dual frequency comb spectrometer, Optica, 5, 320–327, https://doi.org/10.1364/OPTICA.5.000320, 2018. 
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Short summary
Most methane emissions during the life cycle of beef cattle occur during the grazing phase. Measuring methane in grazing systems is difficult due to the high mobility and low density of animals. This work investigates if dual-comb spectroscopy can measure methane emissions from small cattle herds. An enhancement of 10 nmol mol-1 methane above the atmospheric background was measured, equivalent to 20 head located 60 m away. The calculated methane flux was within 5 % of the actual release rate.
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