Pitfalls with the use of enhancement ratios or normalized excess mixing ratios measured in plumes to characterize pollution sources and aging
Pitfalls with the use of enhancement ratios or normalized excess mixing ratios measured in plumes to characterize pollution sources and aging
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DOI：
10.5194/amt-6-2155-2013
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发表时间：
2013-08
影响因子：
3.8
通讯作者：
R. Yokelson;M. Andreae;S. K. Akagi
中科院分区：
文献类型：
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作者：
R. Yokelson;M. Andreae;S. K. Akagi
抽象的。归一化过量混合比（NEMR），也称为增强比，是大气研究中表征污染羽流的常用方法。当单源污染物羽流在大气中扩散时，它们通过与邻近的背景空气混合而被稀释。这种背景空气成分的变化可能会导致NEMR的巨大变化，随后通过遥感，机载或地面仪器进行测量。当边界层羽流进入自由对流层时，这种情况很常见，也可能影响对流层顶部附近的远距离传输或羽流。我们提供了这些问题的背景和一个例子表明，忽视这种影响可能会导致严重的数据解释错误。
Abstract. Normalized excess mixing ratios (NEMRs), also known as enhancement ratios, are a common way to characterize plumes of pollution in atmospheric research. As single-source pollutant plumes disperse in the atmosphere, they are diluted by mixing with the adjacent background air. Changes in the composition of this background air can cause large changes to the NEMR that is subsequently measured by remote-sensing, airborne, or ground-based instruments. This scenario is common when boundary layer plumes enter the free troposphere and could also impact long-range transport or plumes near the top of the troposphere. We provide a context for these issues and an example showing that neglect of this effect could lead to serious errors in data interpretation.