Ammonia Emissions Measured Using Two Different GasFinder Open-Path Lasers

Baldé, Hambaliou; VanderZaag, Andrew; Smith, Ward; Desjardins, Raymond L.

doi:10.3390/atmos10050261

Cited by 7 publications

(9 citation statements)

References 11 publications

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“…Still, some bias in NH 3 concentration due to the choice of cepstral-domain filter function remains at a level comparable to the reported statistical precision (<5%). The combined uncertainty due to the effects discussed here is <10%, smaller than the ~20% disagreement found in previous comparisons of NH 3 flux estimation methods ( 8 , 9 ).…”

Section: Resultscontrasting

confidence: 66%

“…The first demonstration of open-path DCS captured NH 3 absorption signatures with a beam passing over an open bottle of NH 3 ( 31 ). We return to these roots by demonstrating the first coherent, high resolution, open-path DCS detection of NH 3 that enables quantification of feedlot NH 3 flux with precision rivaling commercial sensors ( 8 , 32 ) while also providing vital CH 4 flux.…”

Section: Resultsmentioning

confidence: 99%

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Precise multispecies agricultural gas flux determined using broadband open-path dual-comb spectroscopy

et al. 2021

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Advances in spectroscopy have the potential to improve our understanding of agricultural processes and associated trace gas emissions. We implement field-deployed, open-path dual-comb spectroscopy (DCS) for precise multispecies emissions estimation from livestock. With broad atmospheric dual-comb spectra, we interrogate upwind and downwind paths from pens containing approximately 300 head of cattle, providing time-resolved concentration enhancements and fluxes of CH4, NH3, CO2, and H2O. The methane fluxes determined from DCS data and fluxes obtained with a colocated closed-path cavity ring-down spectroscopy gas analyzer agree to within 6%. The NH3 concentration retrievals have sensitivity of 10 parts per billion and yield corresponding NH3 fluxes with a statistical precision of 8% and low systematic uncertainty. Open-path DCS offers accurate multispecies agricultural gas flux quantification without external calibration and is easily extended to larger agricultural systems where point-sampling-based approaches are insufficient, presenting opportunities for field-scale biogeochemical studies and ecological monitoring.

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Section: Resultscontrasting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Precise multispecies agricultural gas flux determined using broadband open-path dual-comb spectroscopy

et al. 2021

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“…The second problem is the observed rather large variation in the intercalibration from one campaign to another (Table 5). Such a variation between different campaigns was also observed with GF3 devices for ammonia measurements by Baldé et al (2019). Concentration response of the instru- Table 4.…”

Section: Gf3 Side-by-side Intercomparisonssupporting

confidence: 65%

Performance of open-path GasFinder3 devices for CH<sub>4</sub> concentration measurements close to ambient levels

Häni¹,

Bühler²,

Neftel³

et al. 2021

Atmos. Meas. Tech.

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Abstract. Open-path measurements of methane (CH4) with the use of GasFinder systems (Boreal Laser Inc, Edmonton Canada) have been frequently used for emission estimation with the inverse dispersion method (IDM), particularly from agricultural sources. It is common to many IDM applications that the concentration enhancement related to CH4 sources is small, typically between 0.05 and 0.5 ppm, and accurate measurements of CH4 concentrations are needed at concentrations close to ambient levels. The GasFinder3-OP (GF3) device for open-path CH4 measurements is the latest version of the commercial GasFinder systems by Boreal Laser Inc. We investigated the uncertainty of six GF3 devices from side-by-side intercomparison measurements and comparisons to a closed-path quantum cascade laser device. The comparisons were made at near-ambient levels of CH4 (85 % of measurements below 2.5 ppm) with occasional phases of elevated concentrations (max. 8.3 ppm). Relative biases as high as 8.3 % were found, and a precision for half-hourly data between 2.1 and 10.6 ppm-m (half width of the 95 % confidence interval) was estimated. These results deviate from the respective manufacturer specifications of 2 % and 0.5 ppm-m. Intercalibration of the GF3 devices by linear regression to remove measurement bias was shown to be of limited value due to drifts and step changes in the recorded GF3 concentrations.

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“…Such a variation between different campaigns was also observed with GF3 devices for ammonia measurements by Baldé et al (2019). Concentration response of the instrument do change between different campaigns as seen by the regressions and can thus not be generalized.…”

Section: Gf3 Side By Side Intercomparisonsmentioning

confidence: 70%

Performance of open-path GasFinder3 devices for CH<sub>4</sub> concentration measurements close to ambient levels

Häni¹,

Bühler²,

Neftel³

et al. 2020

Preprint

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Abstract. Open-path measurements of methane (CH4) with the use of GasFinder systems has been frequently used for emission estimation with the inverse dispersion method (IDM), specifically from agricultural sources. It is common to many IDM applications that the concentration enhancement related to agricultural CH4 sources is small, typically between 0.05 and 0.5 ppm, and accurate measurements of CH4 concentrations are needed at concentrations close to ambient levels. The GasFinder3-OP (GF3) device for open-path CH4 measurements is the latest version of the commercial GasFinder systems by Boreal Laser Inc. We investigated the uncertainty of six GF3 devices from side by side intercomparison measurements and comparisons to a closed-path quantum cascade laser device. Relative biases as high as 8.3 % were found and a precision between 2.1 and 10.6 ppm-m was estimated. These results deviate from the respective manufacturer specifications of 2 % and 0.5 ppm-m. Intercalibration of the GF3 devices by linear regression to remove measurement bias was shown to be of limited value due to drifts and step changes in the recorded GF3 concentrations.

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Ammonia Emissions Measured Using Two Different GasFinder Open-Path Lasers

Cited by 7 publications

References 11 publications

Precise multispecies agricultural gas flux determined using broadband open-path dual-comb spectroscopy

Precise multispecies agricultural gas flux determined using broadband open-path dual-comb spectroscopy

Performance of open-path GasFinder3 devices for CH<sub>4</sub> concentration measurements close to ambient levels

Performance of open-path GasFinder3 devices for CH<sub>4</sub> concentration measurements close to ambient levels

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Ammonia Emissions Measured Using Two Different GasFinder Open-Path Lasers

Cited by 7 publications

References 11 publications

Precise multispecies agricultural gas flux determined using broadband open-path dual-comb spectroscopy

Precise multispecies agricultural gas flux determined using broadband open-path dual-comb spectroscopy

Performance of open-path GasFinder3 devices for CH&lt;sub&gt;4&lt;/sub&gt; concentration measurements close to ambient levels

Performance of open-path GasFinder3 devices for CH&lt;sub&gt;4&lt;/sub&gt; concentration measurements close to ambient levels

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Performance of open-path GasFinder3 devices for CH<sub>4</sub> concentration measurements close to ambient levels

Performance of open-path GasFinder3 devices for CH<sub>4</sub> concentration measurements close to ambient levels