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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >NOy lifetimes and O-3 production efficiencies in urban and power plant plumes: Analysis of field data
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NOy lifetimes and O-3 production efficiencies in urban and power plant plumes: Analysis of field data

机译：城市和电厂烟气中的NOy寿命和O-3的生产效率：现场数据分析

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In an effort to describe and characterize power plant plumes in the Nashville region, emissions from a small power plant (Gallatin) and a large power plant (Paradise) were examined using data obtained on the Department of Energy G-1 airborne sampling platform. Observations made on July 3, 7, 15, 17, and 18, 1995, were compiled, and a kinetic analysis of the chemical evolution of the power plant plumes was performed. Analysis of the power plant plume data revealed a very active photochemistry, as had been determined previously for the urban plume. Ozone production efficiencies (OPE), defined as the number of molecules of O-3 formed per NOx molecule consumed, were found to be 3 for Gallatin and 2 for Paradise. Lifetimes for NOx (2.8 and 4.2 hours) and NOy (7.0 and 7.7 hours) were determined for Gallatin and Paradise, respectively. These NOx and NOy lifetimes imply rapid loss of NOz (NOz is assumed to be primarily HNO3). Lifetimes for NOz are calculated to be 3 and 2.5 hours for Gallatin and Paradise, respectively. A sensitivity analysis indicates that the Gallatin NOz lifetime could be as long as 5 hours, bringing it into agreement with the value determined for the Nashville urban plume. It is unlikely that the Paradise NOz lifetime is as long as 4 hours. If NOz loss is attributed to dry deposition, a 3 hour lifetime implies a deposition velocity greater than 10 cm s(-1), which is much faster than expected based on accepted theory. Possible reasons for this discrepancy are discussed. [References: 36]
机译：为了描述和表征纳什维尔地区的发电厂烟羽，使用能源部G-1机载采样平台获得的数据检查了小型发电厂（Galatin）和大型发电厂（Paradise）的排放。汇总了1995年7月3日，7日，15日，17日和18日的观察结果，并对电厂羽流的化学演化进行了动力学分析。对电厂羽流数据的分析显示出非常活跃的光化学作用，正如先前针对城市羽流所确定的那样。臭氧生产效率（OPE）定义为每消耗一个NOx分子形成的O-3分子数量，对于Gallatin来说是3，对于Paradise是2。分别确定了Gallatin和Paradise的NOx（2.8小时和4.2小时）和NOy（7.0小时和7.7小时）的寿命。这些NOx和NOy寿命意味着NOz的快速损失（假定NOz主要是HNO3）。计算得出Gallatin和Paradise的NOz寿命分别为3和2.5小时。敏感性分析表明，Gallatin NOz的寿命可能长达5小时，这与Nashville城市烟羽的测定值相符。 Paradise NOz的寿命不可能长达4小时。如果NOz的损失归因于干法沉积，则3小时的使用寿命意味着沉积速度大于10 cm s（-1），这比基于公认理论的预期速度要快得多。讨论了这种差异的可能原因。 [参考：36]

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