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Published online 3 January 2006
Published in J Environ Qual 35:14-20 (2006)
DOI: 10.2134/jeq2005.0250
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Right arrow Dispersion

An Approach for Measuring Methane Emissions from Whole Farms

S. M. McGinna,*, T. K. Fleschb, L. A. Harperc and K. A. Beauchemina

a Agriculture and Agri-Food Canada, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1
b Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada T6G 2E3
c Agricultural Research Service, United States Department of Agriculture, Watkinsville, GA 30677



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  		Fig. 1. Arial view of the study site showing the position of the barn and open pens housing cows, the release points for CH4 and SF6, and the laser and sample lines. The laser in the northwest corner was turned to a north or east reflector depending on wind direction.

 


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  		Fig. 2. Illustration of the on–off timing of CH4 (solid) and SF6 (dashed) for a sampling period.

 


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  		Fig. 3. Example of the time series of line-average methane concentration (CL) taken upwind and downwind of the farm on 9 November.

 


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  		Fig. 4. Hypothetical ratio of emissions calculated using a source configuration of 10 point sources with that using two area sources (Farea/Fpoint), plotted versus distance from the farm boundary to the line-average concentration measurement (fetch).

 




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Copyright © 2006 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.