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Determining ammonia emissions from a cattle feedlot with an inverse dispersion technique

机译:用逆分散技术测定牛饲养场的氨气排放量

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An inverse-dispersion technique is used to calculate ammonia (NH sub(3)) gas emissions from a cattle feedlot. The technique relies on a simple backward Lagrangian stochastic (bLS) dispersion model to relate atmospheric NH sub(3) concentration to the emission rate Q sub(bLS). Because the wind and the source configuration are complicated, the optimal implementation of the technique is unclear. Two categorically different measurement locations (for concentration and winds) are considered: within the feedlot and downwind. The in-feedlot location proved superior, giving a nearly continuous Q sub(bLS) timeseries. We found average emissions of 0.15 kg NH sub(3) animal super(-1) day super(-1) in both 2004 and 2005, representing a loss of 63% (2004) or 65% (2005) of the dietary nitrogen in the animal feed. Downwind measurement locations were less useful for several reasons: a narrow range of useable wind directions; ambiguity in the choice of wind statistics to use in the calculations; low NH sub(3) concentrations; and downwind deposition of NH sub(3). When addressing a large source (like a feedlot) that modifies the ambient wind flow, we recommend in- source measurements for use in inverse-dispersion applications.
机译:逆分散技术用于计算牛饲养场的氨气(NH sub(3))排放。该技术依赖于简单的向后拉格朗日随机(bLS)扩散模型,将大气NH sub(3)的浓度与排放速率Q sub(bLS)相关联。由于风和源的配置很复杂,因此该技术的最佳实现尚不清楚。考虑了两个绝对不同的测量位置(针对集中度和风):育肥场和顺风区域。事实证明,育肥场内的位置优越,可提供近乎连续的Q sub(bLS)时间序列。我们发现2004年和2005年平均排放0.15 kg NH sub(3)动物super(-1)天super(-1),相当于2004年饮食中氮的63%(2004年)或65%(2005年)的损失。动物饲料。顺风测量位置的有用性较低,原因有几个:可用风向范围狭窄;在计算中使用的风力统计数据的选择含糊; NH sub(3)浓度低;和NH sub(3)的顺风沉积。当处理会改变环境风量的大型风源(如饲养场)时,我们建议进行反色散应用中的风源测量。

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