Observed trends in ground-level O3 in Monterrey, Mexico, during 1993-2014: comparison with Mexico City and Guadalajara
Observed trends in ground-level O3 in Monterrey, Mexico, during 1993-2014: comparison with Mexico City and Guadalajara
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DOI：
10.5194/acp-17-9163-2017
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发表时间：
2017-07-31
影响因子：
6.3
通讯作者：
Mendoza, Alberto
中科院分区：
文献类型：
--
作者：
Hernandez Paniagua, Ivan Y.;Clemitshaw, Kevin C.;Mendoza, Alberto
在这里，我们对墨西哥东北部蒙特雷工业都市区 (MMA) 的 O-3 和奇数氧 (O-3 + NO2) 的长期趋势进行了评估。 O-x(AV(d)) 的日振幅用作 O-3 净产量的代表，它受到 NO2 光解速率的影响。尽管在工业区下风处观察到最大 AV(d) 值，但周末和工作日之间没有观察到 AV(d) 的显着差异。 O-3 混合比例最高出现在春季，最低值出现在冬季。 O-3 最大的年度变化通常发生在 MMA 的顺风处，而最小的变化通常发生在人口稠密地区和工业区附近。风能行业对 O-3 前体混合比的分析表明，主要排放源位于 MMA 及其周边地区的工业区。根据地点的不同，O-3 在春季、夏季和秋季有显着的增加趋势，年平均值趋势在 0.19 至 0.33 ppb yr(-1) 之间。总体而言，从1993年到2014年，在MMA内，O-3以平均0.22 ppb yr(-1) (p < 0.01)的速度增加，这与同期在墨西哥城都市区(MCMA)观察到的1.15 ppb yr(-1) (p < 0.001)的下降形成鲜明对比。从 1996 年到 2014 年，瓜达拉哈拉大都市区 (GMA) 内没有观察到明显的趋势。
Here, we present an assessment of long-term trends in O-3 and odd oxygen (O-3 + NO2) at the industrial Monterrey metropolitan area (MMA) in NE Mexico. Diurnal amplitudes in O-x(AV(d)) are used as a proxy for net O-3 production, which is influenced by the NO2 photolysis rate. No significant differences in the AV(d) are observed between weekends and weekdays, although the largest AV(d) values are observed at sites downwind of industrial areas. The highest O-3 mixing ratios are observed in spring, with minimum values in winter. The largest annual variations in O-3 are typically observed downwind of the MMA, with the lowest variations generally recorded in highly populated areas and close to industrial areas. A wind sector analysis of mixing ratios of O-3 precursors revealed that the dominant sources of emissions are located in the industrial regions within the MMA and surrounding area. Significant increasing trends in O-3 in spring, summer, and autumn are observed depending on site location, with trends in annual averages ranging between 0.19 and 0.33 ppb yr(-1). Overall, from 1993 to 2014, within the MMA, O-3 has increased at an average rate of 0.22 ppb yr(-1) (p < 0.01), which is in marked contrast with the decline of 1.15 ppb yr(-1) (p < 0.001) observed in the Mexico City metropolitan area (MCMA) for the same period. No clear trend is observed from 1996 to 2014 within the Guadalajara metropolitan area (GMA).