Dairies contribute a major portion of agricultural ammonia emissions in the United States. Emissions were monitored over two years from an anaerobic lagoon receiving manure from cows in the milking parlor and holding area in Indiana (IN), USA and a storage basin receiving manure from cows in barns as well as the milking parlor and holding area in Wisconsin (WI), USA. Emissions were monitored using open-path tunable diode lasers, sonic anemometers, and two emission models. The mean annual daily emissions at the WI storage basins (30 µg m⁻² s⁻¹) was nearly equal to that at the IN lagoon (27 µg m⁻² s⁻¹). The mean annual daily ammonia (NH₃) emissions on a per animal basis were greater at the WI basins (33 g NH₃ hd⁻¹ d⁻¹; 26 g NH₃ AU⁻¹ d⁻¹) (hd = animal; AU = 500 kg animal mass) than at the IN lagoon (9 g NH₃ hd⁻¹ d⁻¹; 7 g NH₃ AU⁻¹ d⁻¹). Emissions from both storage systems were highest in the summer, lowest in the winter, and similar during the spring and fall. Emissions were strongly correlated with air temperature and weakly correlated with wind conditions. Greater emissions at the WI basins appeared to be related primarily to the characteristics of the stored manure.

中文翻译：

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中西部两个免费摊位奶牛不同肥料存储设施的氨排放

在美国，乳制品占农业氨排放量的主要部分。在美国印第安纳州（IN）的挤奶厅和饲养区的奶牛粪池和威斯康星州的挤奶厅和饲养区的奶牛粪池中收集了来自厌氧池的排放，监测了两年的排放量。美国威斯康星州）。使用开路可调二极管激光器，声波风速计和两个发射模型对发射进行监测。WI储水池的年平均日排放量（30 µg m ^-2 s ^-1）与IN泻湖的日平均排放量（27 µg m ^-2 s ^-1）几乎相等。在威斯康星州，每只动物的年平均氨（NH ₃）排放量更大（33 g NH₃ hd ^-1 d ^-1 ; 比在IN泻湖（9 g NH ₃ hd ^-1 d ^-1 ; 7 g NH ₃ AU ^-1 d ^-1）的NH ₃ AU ^-1 d ^-1（hd =动物; AU = 500千克动物体重））。两种存储系统的排放在夏季最高，在冬季最低，在春季和秋季相似。排放与气温高度相关，而与风况相关性较弱。威斯康星州盆地的更大排放似乎主要与储存肥料的特性有关。