A study of trends for Mexico City ozone extremes

Rodriguez, S.; Huerta, Gabriel; Reyes, Hortensia

doi:10.1080/23737484.2015.1121791

Cited by 7 publications

(10 citation statements)

References 8 publications

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“…Hourly surface ozone concentrations routinely exceed the national standard, set at 110 ppb in 1993 (by law NOM-020- SSA1-1993) and modified in 2014 to 95 ppb (by law NOM-020-SSA1-2014). In 2015, hourly maximum O 3 concentrations in every month of the year exceeded the standard set in 2014 at monitoring stations in all five geographic regions: NE, NW, SE, SW and Center (Rodríguez et al, 2016).…”

Section: Introductionmentioning

confidence: 85%

“…In Mexico City, ozone concentrations have steadily decreased from the early 1990s to the 2010s ( Fig. 4a; also Rodríguez et al, 2016) as a result of pollution control measures (Molina and Molina, 2004). In order to remove the long-term trend, while keeping the intraseasonal variability at hourly resolution, hourly observations were converted to standard anomalies as described in Section 2.…”

Section: Variability Of the Ozone Time Seriesmentioning

confidence: 99%

“…Past studies have examined the variability of surface ozone in Mexico City at different time scales, e.g. hourly (Raga and Le Moyne, 1996;Huerta et al, 2004;Lei et al, 2007), daily (Fast and Zhong, 1998), weekly (Stephens et al, 2008), monthly (Rodríguez et al, 2016), and seasonal (Thompson et al, 2008). All of these studies noted a primary relationship between ozone concentration in Mexico City and ultraviolet (UV) radiation, where days with more UV radiation were associated with elevated surface ozone concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Variability of winter and summer surface ozone in Mexico City on the intraseasonal time scale

Barrett¹,

Raga²

2016

Preprint

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Abstract. Surface ozone concentrations in Mexico City frequently exceed the Mexican standard and have proven difficult to forecast due to changes in meteorological conditions at its tropical location. The Madden-Julian Oscillation (MJO) is largely responsible for intraseasonal variability in the tropics. Circulation patterns in the lower and upper troposphere and precipitation are associated with the oscillation as it progresses eastward around the planet. It is typically described by phases (labeled 1 through 8), which correspond to the broad longitudinal location of the active component of the oscillation with enhanced precipitation. In this study we evaluate the intraseasonal variability of winter and summer surface ozone concentrations in Mexico City was investigated over the period 1986&#8211;2014 to determine if there is a modulation by the MJO that would aid in the forecast of high pollution episodes. Over 1&#8201;000&#8201;000 hourly observations of surface ozone from five stations around the metropolitan area were standardized and then binned by active phase of the MJO, with phase determined using the Real-time Multivariate MJO Index. Highest winter ozone concentrations were found in Mexico City on days when the MJO was active and in phase 2 (over the Indian Ocean), and highest summer ozone concentrations were found on days when the MJO was active and in phase 6 (over the western Pacific Ocean). Lowest winter ozone concentrations were found during active MJO phase 8 (over the eastern Pacific Ocean), and lowest summer ozone concentrations were found during active MJO phase 1 (over the Atlantic Ocean). Anomalies of reanalysis-based cloud cover and UV-B radiation supported the observed variability in surface ozone in both summer and winter: MJO phases with highest ozone concentration had largest positive UV-B radiation anomalies and lowest cloud cover fraction, while phases with lowest ozone concentration had largest negative UV-B radiation anomalies and highest cloud cover fraction. Furthermore, geopotential height anomalies at 250&#8201;hPa favoring reduced cloudiness, and thus elevated surface ozone, were found in both seasons during MJO phases with above-normal ozone concentrations. Similar height anomalies at 250&#8201;hPa favoring enhanced cloudiness, and thus reduced surface ozone, were found in both seasons during MJO phases with below-normal ozone concentrations. These anomalies confirm a physical pathway for MJO modulation of surface ozone via modulation of the upper-troposphere.

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Section: Introductionmentioning

confidence: 85%

Section: Variability Of the Ozone Time Seriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variability of winter and summer surface ozone in Mexico City on the intraseasonal time scale

Barrett¹,

Raga²

2016

Preprint

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“…Barrios and Rodrigues [33] studied the occurrence and duration of ozone exceedances in Mexico City using a queueing theory model. Rodríguez et al [34] studied the ozone trends in Mexico City using the generalized extreme value distribution, where they estimated a trend parameter in each region as well as an overall trend parameter. Martins et al [35] applied the extreme value theory in two large urban regions of Brazil, and the probabilities of exceedance and the return period of high concentration of pollutant were calculated for carbon monoxide, nitrogen oxides, ozone, and suspended particles for both regions.…”

Section: Introductionmentioning

confidence: 99%

“…us, this work focuses on the spatial analysis of CO maxima in the Metropolitan Area of Valley of Mexico using the Bayesian methodology. In Mexico City, with more than 21 million inhabitants in its metropolitan area, air pollution has long been a major concern [34]. In densely populated areas such as Metropolitan Area of the Valley of Mexico, this pollutant can be considered a public health problem.…”

Section: Introductionmentioning

confidence: 99%

A Bayesian Hierarchical Model for the Spatial Analysis of Carbon Monoxide Pollution Extremes in Mexico City

Jiménez-Hernández

López-Cerino

Aguirre-Salado

2020

Mathematical Problems in Engineering

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Air pollution by carbon monoxide is a serious problem that affects many cities around the world, and the theory of extreme values has played a crucial role in the study of this issue. In this paper, we proposed a Bayesian hierarchical spatial model of extreme values to evaluate the risk of extreme events of air pollution due to carbon monoxide in the metropolitan area of Mexico City. Spatial trends are modeled through of a Gaussian process for the generalized extreme value (GEV) distribution parameters, and prediction maps are produced for each of these. The results show a marginal spatial behavior for the location, scale, and shape parameters of GEV distribution, which indicate the existence of local variations that would not be possible to model using only stationary models. A return map of the maximum concentrations with a return period of one year is obtained. We found that the return levels for a one-year return period of CO concentration above 8 ppm in the Metropolitan Area of the Valley of Mexico are concentrated in the central part of this region, and the areas with the lowest estimates are distributed in the periphery. In addition, a quantile-quantile (QQ) plot between the theoretical and empirical quantiles was provided, which showed a very good fit of data to the proposed model.

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Spatiotemporal variations in the air concentrations of 1,3-butadiene in intra-urban environments: a case study in southern Mexico City

Santiago

Echeverría

Galindo

et al. 2022

Int. J. Environ. Sci. Technol.

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A study of trends for Mexico City ozone extremes

Abstract: How to citeComplete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative

Cited by 7 publications

References 8 publications

Variability of winter and summer surface ozone in Mexico City on the intraseasonal time scale

Variability of winter and summer surface ozone in Mexico City on the intraseasonal time scale

A Bayesian Hierarchical Model for the Spatial Analysis of Carbon Monoxide Pollution Extremes in Mexico City

Spatiotemporal variations in the air concentrations of 1,3-butadiene in intra-urban environments: a case study in southern Mexico City

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