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首页> 外文期刊>Atmospheric chemistry and physics >Estimation of NOx and SO2 emissions from Sarnia, Ontario, using a mobile MAX-DOAS (Multi-AXis Differential Optical Absorption Spectroscopy) and a NOx analyzer
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Estimation of NOx and SO2 emissions from Sarnia, Ontario, using a mobile MAX-DOAS (Multi-AXis Differential Optical Absorption Spectroscopy) and a NOx analyzer

机译：使用移动MAX-DOA（多轴差分光学吸收光谱）和NOx分析仪估算Sarnia的NOx和SO2排放量

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Sarnia, Ontario, experiences pollutant emissions disproportionate to its relatively small size. The small size of the city limits traditional top-down emission estimate techniques (e.g., satellite) but a low-cost solution for emission monitoring is the mobile MAX-DOAS (Multi-AXis Differential Optical Absorption Spectroscopy). Measurements were made using this technique from 21 March 2017 to 23 March 2017 along various driving routes to retrieve vertical column densities (VCDs) of NO2 and SO2 and to estimate emissions of NOx and SO2 from the Sarnia region. A novel aspect of the current study was the installation of a NOx analyzer in the vehicle to allow real time measurement and characterization of near-surface NOx/NO2 ratios across the urban plumes, allowing improved accuracy of NOx emission estimates. Confidence in the use of near-surface-measured NOx/NO2 ratios for estimation of NOx emissions was increased by relatively well-mixed boundary layer conditions. These conditions were indicated by similar temporal trends in NO2 VCDs and mixing ratios when measurements were sufficiently distant from the sources. Leighton ratios within transported plumes indicated peroxy radicals were likely disturbing the NO-NO2-O-3 photostationary state through VOC (volatile organic compound) oxidation. The average lower-limit emission estimate of NOx from Sarnia was 1.60 +/- 0.34 t h(-1) using local 10 m elevation wind-speed measurements. Our estimates were larger than the downscaled annual 2017 NPRI-reported (National Pollution Release Inventory) industrial emissions of 0.9 tNO(x) h(-1). Our lower-limit estimate of SO2 emissions from Sarnia was 1.81 +/- 0.83 tSO(2) h(-1), equal within uncertainty to the 2017 NPRI downscaled value of 1.85tSO(2) h(-1). Satellite-derived NO2 VCDs over Sarnia from the ozone monitoring instrument (OMI) were lower than mobile MAX-DOAS VCDs, likely due to the large pixel size relative to the city's size. The results of this study support the utility of the mobile MAX-DOAS method for estimating NOx and SO2 emissions in relatively small, highly industrialized regions, especially when supplemented with mobile NOx measurements.
机译：萨尼亚，安大略省，经历污染物排放不成比例的尺寸。该城市的小尺寸限制了传统的自上而下的排放估计技术（例如，卫星），而是用于发射监测的低成本解决方案是移动MAX-DOA（多轴差分光学吸收光谱）。从2017年3月21日至2017年3月21日使用这种技术进行了测量，沿各种驾驶路线检索NO2和SO2的垂直列密度（VCD），并从Sarnia地区估算NOx和SO2的排放。目前研究的一个新颖方面是在车辆中安装NOx分析仪，以允许实时测量和表征城市羽毛的近表面NOx / NO2比率，从而提高NOx排放估计的准确性。通过相对良好的混合边界层条件，增加了用于估计NOx排放的近表面测量的NOx / NO2比率的置信度。这些条件是通过NO 2 VCDS的类似时间趋势和混合比，当测量与源极远离源时。在运输的羽毛内的Leighton比率表明过氧基团可能会使No-No2-O-3光诱导状态扰乱通过VOC（挥发性有机化合物）氧化。使用局部10米升高风速测量，Sarnia的NOx的平均下限排放估计为1.60 +/- 0.34 T H（-1）。我们的估计大于2017年销售年度令人透露的年度NPRI报告（国家污染释放库存）工业排放0.9 TNO（X）H（-1）。我们从Sarnia的SO2排放的下限估计为1.81 +/- 0.83 TSO（2）H（-1），在2017年NPRI级别值为1.85TSO（2）H（-1）的不确定性内。来自臭氧监测仪器（OMI）的Sarnia的卫星衍生的No2 VCDS低于移动MAX-DOAS VCD，可能是由于相对于城市尺寸的大的像素大小。本研究的结果支持移动MAX-DOAS方法的效用，用于估计相对较小的高度工业化地区的NOx和SO2排放，特别是在补充移动NOx测量时。

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