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首页> 外文期刊>Atmospheric chemistry and physics >Detection of pollution transport events southeast of Mexico City using ground-based visible spectroscopy measurements of nitrogen dioxide
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Detection of pollution transport events southeast of Mexico City using ground-based visible spectroscopy measurements of nitrogen dioxide

机译：利用地面可见光谱法测量二氧化氮，检测墨西哥城东南部的污染迁移事件

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摘要

This work presents ground based differential optical absorption spectroscopy (DOAS) measurements of nitrogen dioxide (NO2) during the MILAGRO field campaign in March 2006 at the Tenango del Aire research site located to the southeast of Mexico City. The DOAS NO2 column density measurements are used in conjunction with ceilometer, meteorological and surface nitric oxide (NO), nitrogen oxides (NOx) and total reactive nitrogen (NOy) measurements to analyze pollution transport events to the southeast of Mexico City during the MILARGO field campaign. The study divides the data set into three case study pollution transport events that occurred at the Tenango del Aire research site. The unique data set is then used to provide an in depth analysis of example days of each of the pollution transport events. An in depth analysis of 13 March 2006, a Case One day, shows the transport of several air pollution plumes during the morning through the Tenango del Aire research site when southerly winds are present and demonstrates how DOAS tropospheric NO2 vertical column densities (VCD), surface NO2 mixing ratios and ceilometer data are used to determine the vertical homogeneity of the pollution layer. The analysis of 18 March 2006, a Case Two day, shows that when northerly winds are present for the entire day, the air at the Tenango del Aire research site is relatively clean and no major pollution plumes are detected. Case 3 days are characterized by relatively clean air throughout the morning with large DOAS NO2 enhancements detected in the afternoon. The analysis of 28 March 2006 show the DOAS NO2 enhancements are likely due to lightning activity and demonstrate how suitable ground-based DOAS measruements are for monitoring anthropogenic and natural pollution sources that reside above the mixing layer.
机译：这项工作介绍了2006年3月在位于墨西哥城东南部的Tenango del Aire研究地点进行的MILAGRO野战期间，对二氧化氮（NO2）进行了基于地面的差分光学吸收光谱（DOAS）测量。 DOAS NO2柱密度测量与云高仪，气象和表面一氧化氮（NO），氮氧化物（NOx）和总活性氮（NOy）测量结合使用，以分析在MILARGO田间向墨西哥城东南部的污染物迁移事件运动。该研究将数据集分为三个案例研究，这些案例研究发生在Tenango del Aire研究现场。然后，使用唯一的数据集对每个污染传输事件的示例天数进行深入分析。对2006年3月13日（一个案例一天）进行的深入分析显示，早晨有几股空气污染烟流在存在南风的情况下通过Tenango del Aire研究地点传输，并演示了DOAS对流层NO2垂直列密度（VCD）使用表面NO2混合比和云高仪数据来确定污染层的垂直均匀性。对2006年3月18日（案例2天）的分析表明，当整天都出现北风时，Tenango del Aire研究地点的空气相对干净，没有发现主要的污染羽流。案例3天的特点是整个早晨空气相对干净，下午发现的DOAS NO2含量大大提高。 2006年3月28日的分析表明，闪电活动可能会增加DOAS NO2的含量，并证明基于地面的DOAS测量方法如何适合监测混合层上方的人为和自然污染源。

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