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
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DOI：
10.1021/acs.est.0c00301
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发表时间：
2020-09-15
影响因子：
11.4
通讯作者：
Floerchinger, Cody
中科院分区：
文献类型：
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作者：
Golston, Levi M.;Pan, Da;Floerchinger, Cody
集中动物饲养操作（CAFO）是氨（NH3）和甲烷（CH 4）的主要排放源。然而，目前的排放清单具有有限的时间分辨率，并使用来自一小部分农场的数据。为此，我们在2014年夏季的DISCOVER-AQ活动期间部署了三个移动的实验室，重点是科罗拉多东北部。利用NH3和CH 4烟羽观测资料，采用反面积源烟羽模拟方法，研究了43个CAFO下风向NH3和CH 4烟羽排放的日变化和站点间变化。在焊接，摩根和拉里默县所有允许的动物的氨排放量估计为1.9千兆克月（-1），比美国NEI 2014年高50%，比8月份的埃德加高360%。甲烷排放量同样估计为10.6千兆克月（-1），与美国GHGI一致，但比埃德加高99%。还观察到CH 4和NH3排放量在重复观测的单个CAFO之间存在显著差异。大型子农场，网站到网站，和日变化表明，在这些尺度上采取的测量，以获得代表性的排放因子的重要性。
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.