Locally induced surface air confluence by complex terrain and its effects on air pollution in the valley of Mexico

Jazcilevich, Arón; García-Reynoso, José Agustín; Caetano, Ernesto

doi:10.1016/j.atmosenv.2005.05.046

Cited by 57 publications

(30 citation statements)

References 14 publications

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“…In 1997, the IMADA-AVER Boundary Layer Experiment found short residence times in the basin with rapid ventilation and recirculation aloft due to vertical wind shear (Fast and Zhong, 1998). Subsequent modeling studies have focused on the horizontal wind convergence zone and its impact on air pollution (Jazcilevich et al, 2005).…”

Section: Meteorological Overviewmentioning

confidence: 99%

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Air quality in North America's most populous city – overview of the MCMA-2003 campaign

et al. 2007

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Section: Meteorological Overviewmentioning

confidence: 99%

“…Furthermore, Mexico City has an urban heat island with potential impacts on the wind circulation (Jauregui, 1997;Jazcilevich et al, 2002). Land surface properties derived from satellite remote sensing using the MODIS instrument were used to improve the representation of surface heat fluxes in MM5 (de Foy et al, 2006b).…”

Section: Meteorological Modeling Studiesmentioning

confidence: 99%

Air quality in North America's most populous city – overview of the MCMA-2003 campaign

et al. 2007

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“…Jazcilevich et al (2003) used a prognostic air quality model to show vertical fumigation episodes due to the complex orography of the MCMA where reactive and non-reactive atmospheric pollutants can travel near the surface, be transported vertically and land in an area opposite to its initial route due to convective downward currents, changing the surface pollutant concentrations on the landing area. Another meteorological mechanism shown by Jazcilevich et al (2005) gives rise to high atmospheric pollution episodes over the MCMA: a local confluence line created when two airflows meet over the city almost canceling their horizontal speed, accumulating pollutants and favoring photochemical reactions. It was concluded that the occurrences of the confluence lines over MCMA are relatively common during the autumn-winter period.…”

Section: Atmospheric Transformationmentioning

confidence: 99%

Organic Compound in Airborne Particles and their Genottoxic Effects in Mexico City

Villalobos-Pietrini¹,

Amador-Muñóz²,

Valle-Hernández³

et al. 2011

Air Quality Monitoring, Assessment and Management

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“…Jazcilevich et al, 2005). Figure 1 shows that overall the ozone peak has been reduced significantly, but high median and maximum concentrations still persist.…”

Section: Discussionmentioning

confidence: 95%

“…See also other MM5 modeling studies of Mexico City, e.g., Jazcilevich et al, 2005). The main features of the Mexico City basin flow are well represented by the model including the northerly flow from the Mexican Plateau during the day, upslope flows on the basin edges and the southerly gap flow from the southeast passage in the late afternoon and early evening.…”

Section: Base Case Simulationmentioning

confidence: 92%

Modeled and observed ozone sensitivity to mobile-source emissions in Mexico City

et al. 2009

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Abstract. The emission characteristics of mobile sources in the Mexico City Metropolitan Area (MCMA) have changed significantly over the past few decades in response to emission control policies, advancements in vehicle technologies and improvements in fuel quality, among others. Along with these changes, concurrent non-linear changes in photochemical levels and criteria pollutants have been observed, providing a unique opportunity to understand the effects of perturbations of mobile emission levels on the photochemistry in the region using observational and modeling approaches. The observed historical trends of ozone (O 3 ), carbon monoxide (CO) and nitrogen oxides (NO x ) suggest that ozone production in the MCMA has changed from a low to a high VOC-sensitive regime over a period of 20 years. Comparison of the historical emission trends of CO, NO x and hydrocarbons derived from mobile-source emission studies in the MCMA from 1991 to 2006 with the trends of the concentrations of CO, NO x , and the CO/NO x ratio during peak traffic hours also indicates that fuel-based fleet average emission factors have significantly decreased for CO and VOCs during this period whereas NO x emission factors do not show any strong trend, effectively reducing the ambient VOC/NO x ratio.This study presents the results of model analyses on the sensitivity of the observed ozone levels to the estimated historical changes in its precursors. The model sensitivity analyses used a well-validated base case simulation of a high pollution episode in the MCMA with the mathematical Decoupled Direct Method (DDM) and the standard Brute Force Method (BFM) in the 3-D CAMx chemical transport model.The model reproduces adequately the observed historical trends and current photochemical levels. Comparison of the BFM and the DDM sensitivity techniques indicates that the model yields ozone values that increase linearly with NO x emission reductions and decrease linearly with VOC emission reductions only up to 30% from the base case. We further performed emissions perturbations from the gasoline fleet, diesel fleet, all mobile (gasoline plus diesel) and all emission sources (anthropogenic plus biogenic). The results suggest that although large ozone reductions obtained in the past were from changes in emissions from gasoline vehicles, currently significant benefits could be achieved with additional emission control policies directed to regulation of VOC emissions from diesel and area sources that are high emitters of alkenes, aromatics and aldehydes.

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Locally induced surface air confluence by complex terrain and its effects on air pollution in the valley of Mexico

Cited by 57 publications

References 14 publications

Air quality in North America's most populous city – overview of the MCMA-2003 campaign

Air quality in North America's most populous city – overview of the MCMA-2003 campaign

Organic Compound in Airborne Particles and their Genottoxic Effects in Mexico City

Modeled and observed ozone sensitivity to mobile-source emissions in Mexico City

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