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Atmosphere 2018, 9(4), 139;

A Technique for Estimating Greenhouse Gas Exchange Adjacent Cattle Feedlots

Agriculture and Agri-Food Canada, Lethbridge, AB T1J 4B1, Canada
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada
Author to whom correspondence should be addressed.
Received: 28 February 2018 / Revised: 6 April 2018 / Accepted: 6 April 2018 / Published: 9 April 2018
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Concentrated animal feeding operations (CAFO) such as open-air beef cattle feedlots are known ‘hot spots’ of emissions of numerous gases including the major greenhouse gases methane, nitrous oxide, and carbon dioxide. Some work has documented CAFOs to derive typical emission factors, but few studies have looked beyond the CAFO to the local landscape to derive the net off-farm emissions. To address the net emissions, the exchange of gases downwind of CAFOs is required, determined in part by the air quality of the gas plume from the CAFO and the characteristics of the underlying surface. Our study measured these downwind fluxes at an open-air beef cattle feedlot using an open-path Fourier Transform Infrared detector and a flux-gradient method. The results showed the dynamic response of fluxes to gas concentration (fresh air or feedlot air) and surface condition (actively growing crop and tilled stubble). These results shed light on the pathways of greenhouse gas flow near a CAFO source, and showed that solely measuring source emissions from a CAFO would lead to errors when developing emission factors. View Full-Text
Keywords: deposition; emission; methane; nitrous oxide; cattle; flux gradient deposition; emission; methane; nitrous oxide; cattle; flux gradient

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McGinn, S.M.; Flesch, T.K. A Technique for Estimating Greenhouse Gas Exchange Adjacent Cattle Feedlots. Atmosphere 2018, 9, 139.

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