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首页> 外文期刊>Atmospheric chemistry and physics >Simulation of Mexico City plumes during the MIRAGE-Mex field campaign using the WRF-Chem model
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Simulation of Mexico City plumes during the MIRAGE-Mex field campaign using the WRF-Chem model

机译：使用WRF-Chem模型模拟MIRAGE-Mex野战期间的墨西哥城羽流

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The quantification of tropospheric O-3 production in the downwind of the Mexico City plume is a major objective of the MIRAGE-Mex field campaign. We used a regional chemistry-transport model (WRF-Chem) to predict the distribution of O-3 and its precursors in Mexico City and the surrounding region during March 2006, and compared the model with in-situ aircraft measurements of O-3, CO, VOCs, NOx, and NOy concentrations. The comparison shows that the model is capable of capturing the timing and location of the measured city plumes, and the calculated variability along the flights is generally consistent with the measured results, showing a rapid increase in O-3 and its precursors when city plumes are detected. However, there are some notable differences between the calculated and measured values, suggesting that, during transport from the surface of the city to the outflow plume, ozone mixing ratios are underestimated by about 0-25% during different flights. The calculated O-3-NOx, O-3-CO, and O-3-NOz correlations generally agree with the measured values, and the analyses of these correlations suggest that photochemical O-3 production continues in the plume downwind of the city (aged plume), adding to the O-3 already produced in the city and exported with the plume. The model is also used to quantify the contributions to OH reactivity from various compounds in the aged plume. This analysis suggests that oxygenated organics (OVOCs) have the highest OH reactivity and play important roles for the O-3 production in the aging plume. Furthermore, O-3 production per NOx molecule consumed (O-3 production efficiency) is more efficient in the aged plume than in the young plume near the city. The major contributor to the high O-3 production efficiency in the aged plume is the reaction RO2+NO. By contrast, the reaction of HO2+NO is rather uniformly distributed in the plume.
机译：墨西哥城羽流顺风层对流层O-3产量的量化是MIRAGE-Mex野外活动的主要目标。我们使用区域化学运输模型（WRF-Chem）预测了2006年3月O-3及其先驱物在墨西哥城及周边地区的分布，并将该模型与O-3的现场飞机测量值进行了比较， CO，VOC，NOx和NOy浓度。比较结果表明，该模型能够捕获被测城市羽流的时间和位置，并且计算出的沿飞行方向的变化通常与测得的结果一致，表明当城市羽流为O-3时，O-3及其前体迅速增加。检测到。但是，计算值和测量值之间存在一些显着差异，这表明在从城市表面到流出羽流的运输过程中，不同飞行期间的臭氧混合比低估了约0-25％。计算得出的O-3-NOx，O-3-CO和O-3-NOz相关性通常与测量值相符，对这些相关性的分析表明，光化学O-3的产生在城市羽状顺风处继续进行（老化烟羽），增加了该城市已经生产并随烟羽一起出口的O-3。该模型还用于量化老化烟羽中各种化合物对OH反应性的贡献。该分析表明，含氧有机物（OVOC）具有最高的OH反应性，并在老化烟羽中对O-3的产生起重要作用。此外，老化的烟羽中每消耗的NOx分子的O-3产量（O-3的生产效率）比城市附近的年轻烟羽更有效。 RO2 + NO反应是老化烟羽中O-3生产效率高的主要原因。相比之下，HO2 + NO的反应相当均匀地分布在羽状流中。

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