Mexico City basin wind circulation during the MCMA-2003 field campaign

Foy, B. de; Caetano, Ernesto; Magaña, Víctor; Zitácuaro, A.; Cárdenas, B.; Retama, Armando; Ramos, Ramón; Molina, Luisa T.; Molina, Mario J.

doi:10.5194/acp-5-2267-2005

Cited by 133 publications

(107 citation statements)

References 15 publications

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“…The Popocatepetl Volcano (Popo, see Figure 1) is located 67 km southeast from the center of the MCMA; however, it is usually a minor source, on a regional scale, of SO 2 impacting the MCMA [9,34]. Given that sulfate is formed in a regional scale [13,18], a larger fraction of this component could also indicate that the aerosol was more aged than in other sites during previous campaigns, which is consistent with the patterns of air circulation that have been described in the Mexico City basin by de Foy et al [35] during the month of April 2003 for the MCMA03 campaign. The same patterns were observed during the MILAGRO campaign in 2006 [36], and are expected to have occurred during ACU15 because the three campaigns occurred in the dry season.…”

Section: Nr-pm1 Chemical Compositionsupporting

confidence: 76%

“…Atmosphere 2018, 9, x FOR PEER REVIEW 6 of 15 indicate that the aerosol was more aged than in other sites during previous campaigns, which is consistent with the patterns of air circulation that have been described in the Mexico City basin by de Foy et al [35] during the month of April 2003 for the MCMA03 campaign. The same patterns were observed during the MILAGRO campaign in 2006 [36], and are expected to have occurred during ACU15 because the three campaigns occurred in the dry season.…”

Section: Nr-pm1 Chemical Compositionsupporting

confidence: 76%

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PM1 Chemical Characterization during the ACU15 Campaign, South of Mexico City

et al. 2018

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Abstract:The "Aerosoles en Ciudad Universitaria 2015" (ACU15) campaign was an intensive experiment measuring chemical and optical properties of aerosols in the winter of 2015, from 19 January to 19 March on a site in the south of Mexico City. The mass concentration and chemical composition of the non-refractory submicron particulate matter (NR-PM 1 ) was determined using an Aerodyne Aerosol Chemical Speciation Monitor (ACSM). The total NR-PM 1 mass concentration measured was lower than reported in previous campaigns that took place north and east of the city. This difference might be explained by the natural variability of the atmospheric conditions, as well as the different sources impacting each site. However, the composition of the aerosol indicates that the aerosol is more aged (a larger fraction of the mass corresponds to sulfate and to low-volatility organic aerosol (LV-OOA)) in the south than the north and east areas; this is consistent with the location of the sources of PM and their precursors in the city, as well as the meteorological patterns usually observed in the metropolitan area.

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Section: Nr-pm1 Chemical Compositionsupporting

confidence: 76%

Section: Nr-pm1 Chemical Compositionsupporting

confidence: 76%

PM1 Chemical Characterization during the ACU15 Campaign, South of Mexico City

et al. 2018

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“…Six types of days were identified according to basin-scale circulations, providing a way for attributing meteorological effects on observed changes in trace gases and particulate matter during the field campaign, in contrast to three episode types for MCMA-2003(de Foy et al, 2005. Well-defined drainage flows into the basin were observed every morning.…”

Section: Local Circulationsmentioning

confidence: 99%

An overview of the MILAGRO 2006 Campaign: Mexico City emissions and their transport and transformation

et al. 2010

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Abstract. MILAGRO (Megacity Initiative: Local And Global Research Observations) is an international collaborative project to examine the behavior and the export of atmospheric emissions from a megacity. The Mexico City Metropolitan Area (MCMA) -one of the world's largest megacities and North America's most populous city -was selected as the case study to characterize the sources, concentrations, transport, and transformation processes of the gases and fine particles emitted to the MCMA atmosphere and to evaluate the regional and global impacts of these emissions. The findings of this study are relevant to the evolution and impacts of pollution from many other megacities.The measurement phase consisted of a month-long series of carefully coordinated observations of the chemistry and physics of the atmosphere in and near Mexico City duringCorrespondence to: L. T. Molina (ltmolina@mit.edu) March 2006, using a wide range of instruments at ground sites, on aircraft and satellites, and enlisting over 450 scientists from 150 institutions in 30 countries. Three ground supersites were set up to examine the evolution of the primary emitted gases and fine particles. Additional platforms in or near Mexico City included mobile vans containing scientific laboratories and mobile and stationary upward-looking lidars. Seven instrumented research aircraft provided information about the atmosphere over a large region and at various altitudes. Satellite-based instruments peered down into the atmosphere, providing even larger geographical coverage. The overall campaign was complemented by meteorological forecasting and numerical simulations, satellite observations and surface networks. Together, these research observations have provided the most comprehensive characterization of the MCMA's urban and regional atmospheric composition and chemistry that will take years to analyze and evaluate fully.Published by Copernicus Publications on behalf of the European Geosciences Union. L. T. Molina et al.: Mexico City emissions and their transport and transformationIn this paper we review over 120 papers resulting from the MILAGRO/INTEX-B Campaign that have been published or submitted, as well as relevant papers from the earlier MCMA-2003 Campaign, with the aim of providing a road map for the scientific community interested in understanding the emissions from a megacity such as the MCMA and their impacts on air quality and climate. This paper describes the measurements performed during MILAGRO and the results obtained on MCMA's atmospheric meteorology and dynamics, emissions of gases and fine particles, sources and concentrations of volatile organic compounds, urban and regional photochemistry, ambient particulate matter, aerosol radiative properties, urban plume characterization, and health studies. A summary of key findings from the field study is presented.

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“…We compare measurements of NO 2 from the standard chemiluminescence analyzer equipped with a molybdenum converter with those from a collocated Differential Optical Absorption Spectroscopy (DOAS) instrument. These measurements are available from the Mexico City Metropolitan Area (MCMA) field campaign [de Foy et al, 2005;Molina et al, 2007] held in April/May of 2003. The chemiluminescence analyzer was calibrated as described by Dunlea et al [2007].…”

Section: Comparison With Doas Measurementsmentioning

confidence: 99%

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

et al. 2008

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[1] We present an approach to infer ground-level nitrogen dioxide (NO 2 ) concentrations by applying local scaling factors from a global three-dimensional model (GEOS-Chem) to tropospheric NO 2 columns retrieved from the Ozone Monitoring Instrument (OMI) onboard the Aura satellite. Seasonal mean OMI surface NO 2 derived from the standard tropospheric NO 2 data product (Version 1.0.5, Collection 3) varies by more than two orders of magnitude (<0.1->10 ppbv) over North America. Two ground-based data sets are used to validate the surface NO 2 estimate and indirectly validate the OMI tropospheric NO 2 retrieval: photochemical steady-state (PSS) calculations of NO 2 based on in situ NO and O 3 measurements, and measurements from a commercial chemiluminescent NO 2 analyzer equipped with a molybdenum converter. An interference correction algorithm for the latter is developed using laboratory and field measurements and applied using modeled concentrations of the interfering species. The OMI-derived surface NO 2 mixing ratios are compared with an in situ surface NO 2 data obtained from the U.S. Environmental Protection Agency's Air Quality System (AQS) and Environment Canada's National Air Pollution Surveillance (NAPS) network for 2005 after correcting for the interference in the in situ data. The overall agreement of the OMI-derived surface NO 2 with the corrected in situ measurements and PSS-NO 2 is À11-36%. A larger difference in winter/spring than in summer/fall implies a seasonal bias in the OMI NO 2 retrieval. The correlation between the OMI-derived surface NO 2 and the ground-based measurements is significant (correlation coefficient up to 0.86) with a tendency for higher correlations in polluted areas. The satellite-derived data base of ground level NO 2 concentrations could be valuable for assessing exposures of humans and vegetation to NO 2 , supplementing the capabilities of the ground-based networks, and evaluating air quality models and the effectiveness of air quality control strategies.Citation: Lamsal, L. N., R.

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Mexico City basin wind circulation during the MCMA-2003 field campaign

Cited by 133 publications

References 15 publications

PM1 Chemical Characterization during the ACU15 Campaign, South of Mexico City

PM1 Chemical Characterization during the ACU15 Campaign, South of Mexico City

An overview of the MILAGRO 2006 Campaign: Mexico City emissions and their transport and transformation

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

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