Variability of Ammonia and Methane Emissions from Animal Feeding Operations in Northeastern Colorado
| Autor: | Kang Sun, Lei Tao, Levi M. Golston, J. Andrew Neuman, Mark A. Zondlo, S. J. Eilerman, Cody Floerchinger, Jeff Peischl, Da Pan |
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| Rok vydání: | 2020 |
| Předmět: |
Methane emissions
Air Pollutants Colorado General Chemistry 010501 environmental sciences Atmospheric sciences 01 natural sciences Animal Feed Methane Plume Ammonia chemistry.chemical_compound chemistry Area source Concentrated Animal Feeding Operation Environmental Chemistry Environmental science Animals Seasons 0105 earth and related environmental sciences |
| Zdroj: | Environmental sciencetechnology. 54(18) |
| ISSN: | 1520-5851 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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