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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Observations of HOx and its relationship with NOx in the upper troposphere during SONEX
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Observations of HOx and its relationship with NOx in the upper troposphere during SONEX

机译：SONEX期间对流层中HOx及其与NOx关系的观测

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Simultaneous measurements of the oxides of hydrogen and nitrogen made during the NASA Subsonic Assessment, Ozone and Nitrogen Oxide Experiment (SONEX) afforded an opportunity to study the coupling between these two important families throughout the free troposphere and lowermost stratosphere. Moreover, the suite of measurements made during the campaign was unprecedented in its completeness, thus providing a uniquely detailed picture of the radical photochemistry that drives oxidation and ozone production in this part of the atmosphere. On average, observed hydrogen oxides (HOx = OH + HO2) agree well with both instantaneous and diel steady-state models; however, there is a persistent deviation of the observations that correlates with the abundance of nitrogen oxides (NOx = NO + NO2) in the sampled air mass. Specifically, the observed HOx tends to exceed the model predictions in the presence of high NOx concentrations, by as much as a factor of 5 (>500 pptv NOx), and is sometimes as little as half that expected by steady state at lower NOx levels. While many possibilities for these discrepancies are discussed, it is argued that an instrumental artifact is not probable and that the discrepancy may bespeak a shortcoming of our understanding of HOx chemistry. The consistently elevated HOx in the presence of elevated NOx leads directly to greater ozone production than expected, thereby extending the NOx-limited regime of the upper troposphere. These results could thus have bearing on the predicted impacts of increasing NO, emissions into this region of the atmosphere from, for example, the growth of global air traffic. [References: 34]
机译：在NASA亚音速评估，臭氧和氮氧化物实验（SONEX）中对氢和氮的氧化物进行了同时测量，这为研究这两个重要对流层在整个对流层和最低平流层之间的耦合提供了机会。此外，在竞选期间进行的一系列测量在其完整性方面是空前的，从而提供了驱动光在这部分大气中氧化和臭氧产生的自由基光化学的独特详细图像。平均而言，观察到的氧化氢（HOx = OH + HO2）与瞬时模型和diel稳态模型均吻合良好。但是，观测值存在持续偏差，与采样空气中氮氧化物的含量（NOx = NO + NO2）有关。具体而言，在高NOx浓度下，观察到的HOx往往会超出模型预测值的5倍（> 500 pptv NOx），有时低至NOx较低时稳态所期望的一半。 。尽管讨论了这些差异的许多可能性，但有人认为仪器伪像是不可能的，并且该差异可能表明我们对HOx化学的理解存在缺陷。在NOx含量较高的情况下，不断升高的HOx含量直接导致臭氧产量超出预期，从而扩大了对流层上部的NOx限制范围。因此，这些结果可能与增加的NO产生的预期影响有关，例如，全球航空运输量的增加，向该区域的排放量增加。 [参考：34]

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