Characterization of NOx-Ox relationships during daytime interchange of air masses over a mountain pass in the Mexico City megalopolis

García-Yee, José Santos; Torres‐Jardón, Ricardo; Barrera-Huertas, Hugo Alberto; Castro, T.; Peralta, Oscar; García, Manuel; Gutiérrez, Wilfredo; Olivares-Robles, Miguel Ángel; Torres-Jaramillo, Jorge Alejandro; Ortínez-Álvarez, Abraham; Ruíz-Suárez, L. G.

doi:10.1016/j.atmosenv.2017.11.017

Cited by 9 publications

(6 citation statements)

References 30 publications

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“…All of them are represented by empty white circles in Figure 1. Short-term (up to five weeks) continuous data were obtained in several rural and periurban sites within the region using mobile units as part of studies funded for other purposes [39][40][41] (Figure 1, stars).…”

Section: Continuous Monitoringmentioning

confidence: 99%

“…The O 3 comparison between the model and data from several MCMA monitoring stations has an index of agreement greater than 0.81 [54]. The index value decreased to 0.5 < I c < 0.66 when compared with the rural and periurban sites monitored during two intensive campaigns [40,41]. The aim of some tasks in the following boxes is to improve on this metric.…”

Section: Boxmentioning

confidence: 99%

“…The sites selected were rural or periurban. From the 2011 campaign [40], the Amecameca site was chosen. This site, located in the State of Mexico at the Tenango del Aire mountain pass, connects the Valley of Mexico with the valleys of Cuautla and Cuernavaca.…”

Section: Boxmentioning

confidence: 99%

“…The AOT40 indicator calculated for the rural and periurban sites in the 2011 [40] and 2012 [56] campaigns were then appended to the interpolating data set, yielding Figure 4c.…”

Section: Boxmentioning

confidence: 99%

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Estimation of the Impact of Ozone on Four Economically Important Crops in the City Belt of Central Mexico

et al. 2018

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In this work, we report the economic impact of exposure to high ozone concentrations on four important crops in the area of influence of the Mexico City Megalopolis. Estimated yield losses were as follows: maize: 3%; oats: 26%; beans: 14%; sorghum: 15%. The information needed to estimate the impact of air pollution in Mexico is decidedly deficient. Regarding ozone, the coverage provided by the monitoring networks is strongly focused on urban monitoring and its consistency over time is highly irregular. Apart from the Mexico City Metropolitan Area (MCMA) and less than a handful of other cities, the quality of the data is poor. Ozone in rural areas can be estimated with air quality models. However, these models depend on a high-resolution emissions inventory, which has only been done through validation processes in the MCMA. With these limitations, we set out to estimate the economic impact of exposure to ozone in these crops with a varying degree of sensitivity to ozone in the city belt of Central Mexico. To this end, we developed a procedure that makes optimal use of the sparse information available for construction of AOT40 (accumulated exposure over the threshold of 40 ppb) exceedance maps for the 2011 growing season. We believe that, due to the way in which we dealt with the sparse information and the uncertainty regarding the available data, our findings lie on the safe side of having little knowledge such that they may be useful to decision-makers. We believe that this procedure can be extended to the rest of the country, and that it may be useful to developing countries with similar monitoring and modeling capacities. In addition, these impacts are not evenly distributed in the region and sometimes they were greater in municipalities that have a higher index of poverty. Air pollution arriving from urban areas increases the social inequalities to which these already vulnerable populations are exposed.

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Section: Continuous Monitoringmentioning

confidence: 99%

Section: Boxmentioning

confidence: 99%

Section: Boxmentioning

confidence: 99%

“…The AOT40 indicator calculated for the rural and periurban sites in the 2011 [40] and 2012 [56] campaigns were then appended to the interpolating data set, yielding Figure 4c.…”

Section: Boxmentioning

confidence: 99%

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Estimation of the Impact of Ozone on Four Economically Important Crops in the City Belt of Central Mexico

et al. 2018

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“…The problem of surface O 3 is exacerbated because Mexico City, a megacity with 21 million inhabitants, receives intense solar radiation at its tropical latitude (19.4°N) and high elevation (more than 2,200 m above sea level; Lei et al, 2008). The city is also in a shallow basin, effectively preventing ventilation of polluted air (de Foy et al, 2006;Edgerton et al, 1999;Fast & Zhong, 1998;García-Yee et al, 2018;Whiteman et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

A Multiscale Analysis of the Tropospheric and Stratospheric Mechanisms Leading to the March 2016 Extreme Surface Ozone Event in Mexico City

et al. 2019

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This study analyzed the physical mechanisms behind a multiday high surface ozone (O3) event in Mexico City in March 2016. In early March, a strong zonal jet stream over the Pacific Ocean amplified and underwent wave breaking. An unusual cutoff low pressure system then migrated across central Mexico, with 200‐hPa geopotential heights among the lowest in the reanalysis historical record (1948 to present). A tropopause fold on the west side of the cutoff low transported O3‐rich air from the stratosphere into the troposphere and resulted in high O3 concentrations all the way to the surface. The stratospheric intrusion began on 09 March and ended on 12 March, but surface O3 concentrations continued to rise, peaking on 14 March. Given the deep boundary layer observed on 12 March, it is very likely that remnants of the stratospheric O3 in the midtroposphere at the regional level could have been entrained into the boundary layer. Furthermore, our analysis indicates that as the cutoff low progressed eastward, the pronounced low‐level thermal inversion and reduced ventilation observed on subsequent days (13–15 March) contributed to elevated concentrations of O3 precursors, which together with strong UV radiation, led to efficient photochemical production of O3 and to the very large values observed in several of the monitoring stations (up to 210 parts per billion on 14 March). Finally, mitigation measures put into place by authorities reduced both the number of vehicles on the road and the resulting nighttime titration, possibly extending the duration of dangerous O3 levels in the city.

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Atmospheric Changes and Ozone Increase in Mexico City During 2020: Recommended Remedial Measures

Sakthi

Ponniah

Gopalakrishnan

et al. 2023

Environmental Earth Sciences

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Characterization of NOx-Ox relationships during daytime interchange of air masses over a mountain pass in the Mexico City megalopolis

Cited by 9 publications

References 30 publications

Estimation of the Impact of Ozone on Four Economically Important Crops in the City Belt of Central Mexico

Estimation of the Impact of Ozone on Four Economically Important Crops in the City Belt of Central Mexico

A Multiscale Analysis of the Tropospheric and Stratospheric Mechanisms Leading to the March 2016 Extreme Surface Ozone Event in Mexico City

Atmospheric Changes and Ozone Increase in Mexico City During 2020: Recommended Remedial Measures

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