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Ammonia Emissions Measured Using Two Different GasFinder Open-Path Lasers

Agriculture and Agri-Food Canada, Ottawa, ON K1A0C6, Canada
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Atmosphere 2019, 10(5), 261; https://doi.org/10.3390/atmos10050261
Received: 3 March 2019 / Revised: 2 May 2019 / Accepted: 6 May 2019 / Published: 10 May 2019
(This article belongs to the Special Issue Livestock Odor and Air Quality)
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Abstract

The challenges of accurately measuring in situ ammonia (NH3) losses from agricultural systems are well known. Using an open path laser coupled with a backward Lagrangian stochastic dispersion model is a promising approach for quantifying both point- and area-sources; however, this approach requires the open path laser to detect low NH3 concentrations and small concentration differences. In this study, we compared the new GasFinder3 open path laser (Boreal laser Inc., Edmonton, Canada) with the GasFinder2 sensor, the previous version. The study took place at two locations: an outdoor open-air manure compost site, and a field of wheat stubble which was fertilized with urea ammonium nitrate. Results showed the two lasers reported similar concentrations during three days of measurements at the compost site, but differed at the field site, where concentrations were close to the minimum detection limit. The GasFinder3 had a lower standard deviation under all conditions, especially with low wind speed and high relative humidity. View Full-Text
Keywords: open path laser; GasFinder2; GasFinder3; low ammonia concentrations and emissions; manure compost windrows; fertilizer application; backward Lagrangian stochastic model open path laser; GasFinder2; GasFinder3; low ammonia concentrations and emissions; manure compost windrows; fertilizer application; backward Lagrangian stochastic model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Baldé, H.; VanderZaag, A.; Smith, W.; Desjardins, R.L. Ammonia Emissions Measured Using Two Different GasFinder Open-Path Lasers. Atmosphere 2019, 10, 261.

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