Ammonia emissions from a beef feedlot: Comparison of inverse modeling techniques using long-path and point measurements of fenceline NH3

Shonkwiler, K. B.; Ham, Jay M.

doi:10.1016/j.agrformet.2017.10.031

Cited by 24 publications

(16 citation statements)

References 53 publications

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“…In this study, we obtain 2.27 ± 0.23 g NH3 head −1 hr −1 for beef cattle and 5.33 ± 0.49 g NH3 head −1 hr −1 for dairy cattle. The quantity for beef is in relative agreement with several other studies at two sites in Colorado, including 2.64 ± 0.26 g NH 3 head –1 hr –1 from Sun et al using eddy covariance in November 2013 and 3.33 ± 1.63 g NH 3 head –1 hr –1 from Shonkwiler and Ham using inverse modeling in July–September 2014. , …”

Section: Resultssupporting

confidence: 89%

“…Ammonia emissions lead to fine particulate matter formation, elevated dry and wet nitrogen deposition, and damage to nutrient sensitive ecosystems . In northeastern Colorado, the local population of dairy and beef cattle is of special concern due its proximity to Rocky Mountain National Park . During upslope flow events, , local NH 3 emissions can be efficiently transported into the park, contributing to annual exceedance of its critical nitrogen load. , Modeling such events requires detailed knowledge of the meteorological conditions and distribution of regional sources and sinks.…”

Section: Introductionmentioning

confidence: 99%

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Variability of Ammonia and Methane Emissions from Animal Feeding Operations in Northeastern Colorado

Golston

Pan

Sun

et al. 2020

Environ. Sci. Technol.

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Concentrated animal feeding operations (CAFOs) are major emitters of both ammonia (NH3) and methane (CH4). However, current emission inventories have limited temporal resolution and use data derived from a small subset of farms. To this end, we deployed three mobile laboratories during the DISCOVER-AQ campaign in summer 2014 with a focus on northeastern Colorado. Observations of NH3 and CH4 plumes downwind of 43 CAFOs were used to investigate the diurnal and site-to-site variability of emissions with an inverse area source plume modeling approach. Ammonia emissions scaled to all permitted animals in Weld, Morgan, and Larimer counties were estimated at 1.9 Gg month–1, 50% greater than the U.S. NEI 2014 and 360% greater than EDGAR for the month of August. Methane emissions were likewise estimated at 10.6 Gg month–1, consistent with the U.S. GHGI but 99% greater than EDGAR. Significant differences between individual CAFOs with repeat observations were also observed for both CH4 and NH3 emissions. The large subfarm, site-to-site, and diurnal variabilities observed show the importance of measurements taken across these scales in order to derive representative emission factors.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Variability of Ammonia and Methane Emissions from Animal Feeding Operations in Northeastern Colorado

Golston

Pan

Sun

et al. 2020

Environ. Sci. Technol.

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“…Ammonia emissions from feedlots within the footprint of the tall tower could also be substantial. For instance, recent estimates of mean summertime emissions from beef feedlot facilities in Colorado, USA were on the order of 3 to 4 nmol m −2 s −1 with mean maximum values reaching 8 nmol m −2 s −1 (Shonkwiler & Ham, ).…”

Section: Resultsmentioning

confidence: 99%

Tall Tower Ammonia Observations and Emission Estimates in the U.S. Midwest

Griffis

Baker

et al. 2019

JGR Biogeosciences

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Atmospheric ammonia (NH 3 ) has increased dramatically as a consequence of the production of synthetic nitrogen (N) fertilizer and proliferation of intensive livestock systems. It is a chemical of environmental concern as it readily reacts with atmospheric acids to produce fine particulate matter and indirectly contributes to nitrous oxide (N 2 O) emissions. Here, we present the first tall tower observations of NH 3 within the U.S. Corn Belt for the period April 2017 through December 2018. Hourly average NH 3 mixing ratios were measured at 100 and 56 m above the ground surface and fluxes were estimated using a modified gradient approach. The highest NH 3 mixing ratios (>30 nmol mol −1 ) occurred during early spring and late fall, coinciding with the timing of fertilizer application within the region and the occurrence of warm air temperatures. Net ecosystem NH 3 exchange was greatest in spring and fall with peak emissions of about +50 nmol m −2 s −l . Annual NH 3 emissions estimated using state-of-the-art inventories ranged from 0.6 to 1.4 × the mean annual gross tall tower fluxes (+2.1 nmol m −2 s −1 ). If the tall tower observations are representative of the Upper Midwest and broader U.S. Corn Belt regions, the annual gross emissions were +720 Gg NH 3 -N y −1 and +1,340 Gg NH 3 -N y −1 , respectively. Finally, considering the N 2 O budget over the same region, we estimated total reactive N emissions (i.e., N 2 O + NH 3 ) of approximately 1,790 Gg N y −1 from the U.S. Corn Belt, representing~23% of the current annual new N input.

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“…Emissions to the atmosphere from tailings ponds include methane (CH 4 ), carbon dioxide (CO 2 ), reduced sulfur compounds, volatile organic compounds (VOCs), and polycyclic aromatic hydrocarbons (PAHs) (Siddique et al, 2007;Simpson et al, 2010;Yeh et al, 2010;Siddique et al, 2011Siddique et al, , 2012Galarneau et al, 2014;Small et al, 2015;Bari and Kindzierski, 2018;Zhang et al, 2019;Foght et al, 2017;Penner and Foght, 2010). Emissions from tailings ponds vary with pond conditions, such as pond age and solvent additives in the ponds, and can contribute significantly to total facility emissions (Small et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Quantifying fugitive gas emissions from an oil sands tailings pond with open-path Fourier transform infrared measurements

et al. 2021

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Abstract. Fugitive emissions from tailings ponds contribute significantly to facility emissions in the Alberta oil sands, but details on chemical emission profiles and the temporal and spatial variability of emissions to the atmosphere are sparse, since flux measurement techniques applied for compliance monitoring have their limitations. In this study, open-path Fourier transform infrared spectroscopy was evaluated as a potential alternative method for quantifying spatially representative fluxes for various pollutants (methane, ammonia, and alkanes) from a particular pond, using vertical-flux-gradient and inverse-dispersion methods. Gradient fluxes of methane averaged 4.3 g m−2 d−1 but were 44 % lower than nearby eddy covariance measurements, while inverse-dispersion fluxes agreed to within 30 %. With the gradient fluxes method, significant NH3 emission fluxes were observed (0.05 g m−2 d−1, 42 t yr−1), and total alkane fluxes were estimated to be 1.05 g m−2 d−1 (881 t yr−1), representing 9.6 % of the facility emissions.

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Ammonia emissions from a beef feedlot: Comparison of inverse modeling techniques using long-path and point measurements of fenceline NH3

Cited by 24 publications

References 53 publications

Variability of Ammonia and Methane Emissions from Animal Feeding Operations in Northeastern Colorado

Variability of Ammonia and Methane Emissions from Animal Feeding Operations in Northeastern Colorado

Tall Tower Ammonia Observations and Emission Estimates in the U.S. Midwest

Quantifying fugitive gas emissions from an oil sands tailings pond with open-path Fourier transform infrared measurements

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