Detection of pollution transport events southeast of Mexico City using ground-based visible spectroscopy measurements of nitrogen dioxide

Melamed, Megan L.; Basaldud, R.; Steinbrecher, R.; Emeis, Stefan; Ruíz-Suárez, L. G.; Grütter, Michel

doi:10.5194/acp-9-4827-2009

Cited by 22 publications

(11 citation statements)

References 54 publications

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“…also utilized transport categories to explain variations in OC and EC observed at T1 and T2. Melamed et al (2009) studied the transport of the urban plume in the mountain gap southeast of the Chalco Valley using DOAS columns and surface measurements of NO 2 combined with ceilometer measurements at Tenango del Aire. In addition to the urban plume, NO 2 aloft was detected, possibly due to other factors such as biomass burning, volcanic sources or lightning NO x .…”

Section: Meteorological Transport Studiesmentioning

confidence: 99%

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

Molina¹

2010

Preprint

105

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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 pollutants 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 during 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 that will take years to analyze and evaluate fully. In 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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Section: Meteorological Transport Studiesmentioning

confidence: 99%

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

Molina¹

2010

Preprint

105

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“…1) was considered the most seriously affected region of the city because of the many pollutant sources present, such as the Guangdong Yuehua Power Plant (the largest power plant in Guangzhou according to the Guangzhou Environmental Center), the Guangzhou Hengyun thermal power company, and the Guangzhou Zhujiang steel company, where air pollutants such as SO 2 , NO 2 , VOCs, and fine particulates are emitted. Regional studies investigated that area sources have a very strong influence on air quality through the regional transport of air pollutants, possibly causing severe pollution events to the area and its neighbors (Melamed et al, 2009;Takashima et al, 2011). The temporal and spatial scale of transport can range from a few days to several weeks and from a few kilometers to hundreds of kilometers.…”

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confidence: 99%

Observations of SO<sub>2</sub> and NO<sub>2</sub> by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010

Xie

et al. 2013

Atmos. Meas. Tech.

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Abstract. Mobile passive differential optical absorption spectroscopy measurements of SO2 and NO2 were performed in the Guangzhou eastern area (GEA) during the Guangzhou Asian Games 2010 from November 2010 to December 2010. The observations were carried out between 10:00 to 13:00 (local time, i.e., during daylight). Spatial and temporal distributions of SO2 and NO2 in this area were obtained and emission sources were determined using wind field data. The NO2 vertical column densities were found to agree with Ozone Monitoring Instrument values. The correlation coefficient (referred to as R2) was 0.88 after cloud filtering within a specific ground pixel. During the Guangzhou Asian Games and Asian Paralympics (Para) Games, the SO2 and NOx emissions in the area were quantified using averaged wind speed and wind direction. For times outside the games the average SO2 emission was estimated to be 9.50 ± 0.90 tons per hour and the average NOx emission was estimated to be 5.87 ± 3.46 tons per hour. During the phases of the Asian and Asian Para Games, the SO2 and NOx emissions were reduced by 53.50% and 43.50%, respectively, compared to the usual condition. We also investigated the influence of GEA on Guangzhou University Town, the main venue located northwest of the GEA, and found that SO2 concentrations here were about tripled by emissions from the GEA.

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“…also utilized transport categories to explain variations in OC and EC observed at Tl and T2. Melamed et al (2009) studied the transport of the urban plume in the mountain gap southeast of the Chalco Valley using DOAS columns and surface measurements of NO2 combined with ceilometer measurements at Tenango del Aire. In addition to the urban plume, NO2 aloft was detected, possibly due to other factors such as biomass burning, volcanic sources or lightning NO x .…”

Section: Meteorological Transport Studiesmentioning

confidence: 99%

Aerosol Absorption and Scattering Measurements: Field Measuremnets and Laboratory Characterizations.

Marley¹,

Gaffney²

2011

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A suite of instrumentation was deployed in MAX-Mex at site TO, located in the northern part of the Mexico City Metropolitan Area, (MCMA), for the characterization of the aerosol optical properties in the field. Measurements were made of the following aerosol properties: (1) aerosol absorption as a function of wavelength, measured at two minute intervals with a 7-wavelength Aethalometer (2) aerosol scattering as a function of wavelength, measured at one minute intervals with a 3-wavelength nephelometer; 3) aerosol scattering as a function of relative humidity (RH), measured at one minute intervals with 2 single-wavelength nephelometers operated under dry (10% RH) and wet (80% RH) conditions; and 4) collection of sizefractionated aerosol samples on quartz fiber filters at 12 hour intervals (day/night) for further laboratory characterization. Aerosol filter samples were also collected at site Tl (located north of MCMA) for comparison with those collected in the city center. Preliminary results from in situ measurements have indicated an enhanced UV absorption in the afternoon over that expected from black carbon (BC) aerosols alone. These results are directly applicable to both modeling of aerosol radiative forcing and satellite optical depth retrieval algorithms. Both of these applications assume that the aerosol absorption is due only to BC with a wavelength dependence of A, " whereas results obtained in MAX-Mex show that the aerosol wavelength exponent varies over Mexico City from -0.7 to -1.5.All of the data collected in the field from the measurement sets 1-3 have been made available to the ASP community via the MILAGRO data site housed at NCAR. The laboratory characterization of aerosol samples collected in the ASP MAX-Mex field study compared results from Mexico City to samples collected at other sites, including Chicago, Little Rock, and Mt. Bachelor, OR. The project focused on obtaining complete spectral characterization of aerosolsespecially their absorption characteristics as they relate to basic chemical functional groups. Particular attention was given to organics and from biogenic derived organic compounds. This included determinations of the UV-Visible-NIR characteristics of the aerosol absorption as reported as Angstrom Absorption Exponents. Correlation of these results with IR band observations of carboxylic acid, and carboxylate groups were conducted, along with past correlations with carbon isotopic data that indicated significant enhancements of UV-Visible absorption from biogenic aerosols (both biomass burning and secondary organic aerosols). Relationships to other ASP ProjectsThis project collaborated with a number of currently funded ASP projects including research being conducted by Dr. W. Patrick Arnott at the University of Nevada, Reno. Dr. Arnott made use of photoacoustic spectroscopy and light scattering at one or two wavelengths to determine SSA of the aerosol. Comparison of the aethalometer data as well as MAAP instrumentation yielded good to excellent agreement between the instruments...

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Detection of pollution transport events southeast of Mexico City using ground-based visible spectroscopy measurements of nitrogen dioxide

Cited by 22 publications

References 54 publications

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

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

Observations of SO<sub>2</sub> and NO<sub>2</sub> by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010

Aerosol Absorption and Scattering Measurements: Field Measuremnets and Laboratory Characterizations.

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Detection of pollution transport events southeast of Mexico City using ground-based visible spectroscopy measurements of nitrogen dioxide

Cited by 22 publications

References 54 publications

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

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

Observations of SO&lt;sub&gt;2&lt;/sub&gt; and NO&lt;sub&gt;2&lt;/sub&gt; by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010

Aerosol Absorption and Scattering Measurements: Field Measuremnets and Laboratory Characterizations.

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Product

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Observations of SO<sub>2</sub> and NO<sub>2</sub> by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010