Seasonal changes in the PM1 chemical composition north of Mexico City

Guerrero, Franco; Álvarez-Ospina, Harry; Retama, Armando; López-Medina, Alfonso; Castro, T.; Salcedo, D.

doi:10.20937/atm.2017.30.03.05

Cited by 19 publications

(19 citation statements)

References 12 publications

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“…During ACU15, NR-PM 1 represented approximately 100% of the PM 2.5 , indicating that the non-refractory components (BC and crustal material, for example) comprised only a small fraction of the fine particles. Table 1 presents the average PM concentrations measured during ACU15, at LAA [19], and during other previous campaigns in Mexico City using an Aerodyne AMS (MCMA-03 [18], and MILAGRO [13]). The concentrations of NR-PM 1 , BC, and PM 2.5 showed some variability among campaigns, with the largest concentrations in 2003 and the lowest in 2015.…”

Section: Pm Concentrationsmentioning

confidence: 99%

“…This difference will be further explored in Section 3.4. [13,18,19]. AMS: Aerosol Mass Spectrometer.…”

Section: Nr-pm1 Chemical Compositionmentioning

confidence: 99%

“…Grey points correspond to all data points during ACU15. Black symbols correspond to average f44 vs. f43 during the AMS campaigns [13,18,19]. Red symbols correspond to the PMF OOA factors during ACU15 and MILAGRO [13].…”

Section: Organic Fractionmentioning

confidence: 99%

“…During these studies, a large amount of information regarding the PM in the MCMA was collected in real-time with high resolution, using Aerodyne Aerosol Mass Spectrometers (AMSs) [12][13][14][15][16][17][18]. A more recent similar study was published by Guerrero et al [19] describing the PM 1 chemical composition in a site near T0 (Laboratorio de Análisis Ambiental, LAA) during the 2013-2014 winter/spring season, using an Aerodyne Aerosol Chemical Speciation Monitor (ACSM) [20]. These studies showed that the composition of the submicron particulate matter (PM 1 ) during the spring is very similar in both areas of the city (north and east), and that it has not changed significantly from 2003 to 2014.…”

Section: Introductionmentioning

confidence: 99%

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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: Pm Concentrationsmentioning

confidence: 99%

“…This difference will be further explored in Section 3.4. [13,18,19]. AMS: Aerosol Mass Spectrometer.…”

Section: Nr-pm1 Chemical Compositionmentioning

confidence: 99%

Section: Organic Fractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…Parworth et al, 2015). Although the MPSS is certainly the most popular instrument for particle mass closure analysis, the TEOM-FDMS can be used, since it provides the PM mass concentration directly (Petit et al, 2015;Guerrero et al, 2017).…”

Section: Introduction 15mentioning

confidence: 99%

Multi-Year ACSM measurements at the Central European Research Station Melpitz (Germany) Part I: Instrument Robustness, Quality Assurance, and Impact of Upper Size Cut-Off Diameter

Poulain¹,

Spindler²,

Grüner³

et al. 2019

Preprint

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Abstract. The Aerosol Chemical Speciation Monitor (ACSM) is an instrument for identifying and quantifying the influence of air quality mitigations. For this purpose, a European ACSM network has been developed within the research infrastructure project ACTRIS (European Research Infrastructure for the observation of Aerosol, Clouds and Trace Gases). To ensure the uniformity of the dataset, as well as instrumental performance and variability, regular intercomparisons are organized at the Aerosol Chemical Monitoring Calibration Center (ACMCC, part of the European Center for Aerosol Calibration, Paris, France). However, in-situ quality assurance remains a fundamental tracking point of the instrument’s stability. In order to check the robustness of the ACSM over the years and to characterize the seasonality effect, nitrate, sulfate, ammonium, organic, and particle mass concentrations were systematically compared with collocated measurements including daily off-line high-volume PM1 and PM2.5 filter samples. Mass closure analysis was made by comparing the total particle mass (PM) concentration obtained by adding the mass concentration of equivalent black carbon (eBC) from the Multi-Angle Absorption Photometer (MAAP) to the ACSM chemical composition, to that of PM1 and PM2.5 during filter weighting, as well as to the derived mass concentration of particle number size distribution measurements (PNSD). A combination of PM1 and PM2.5 filter samples helps identify the critical importance of the upper size cut-off of the ACSM during such exercises. The ACSM-MAAP-derived mass concentrations systematically deviate from the PM1 samples when the mass concentration of the latter represents less than 60 % of PM2.5, which is linked to the transmission efficiency of the aerodynamic lenses of the ACSM. The best correlations are obtained for sulfate (slope 0.96, R2 = 0.77) and total PM (slope 1.02, R2 = 0.90). Although, sulfate does not exhibit a seasonal dependency, total PM mass concentration shows a small seasonal effect associated with an increase in non-water-soluble fractions. The nitrate suffers from a loss of ammonium nitrate during filter collection, and the contribution of organo-nitrate compounds to the ACSM nitrate signal make it difficult to directly compare the two methods. The contribution of m/z 44 (f44) to the total organic mass concentration was used to convert the ACSM organic mass to OC by using a similar approach as for the AMS. The resulting estimated OC-ACSM was compared with the measured OC-PM1 (slope 0.74, R2 = 0.77), indicating that the f44 signal was relatively free of interferences during this period. The PM2.5 filter samples use for the ACSM data quality might suffer from a systematic bias due to a size cutting effect as well as to the presence of chemical species that cannot be detected by the ACSM in coarse mode (e.g. sodium nitrate and sodium sulfate). This may lead to a systematic underestimation of the ACSM particle mass concentration and/or a positive artefact that artificially decreases the discrepancies between the two methods. Consequently, ACSM data validation using PM2.5 filters has to be interpreted with extreme care. The particle mass closure with the PNSD was satisfying (slope 0.77, R2 = 0.90 over the entire period), with a slightly overestimation of the MPSS derived mass concentration in winter. This seasonal variability was related to a change on the PNSD and a larger contribution of the super-µm particles in winter. This long-term analysis between the ACSM and other collocated instruments confirms the robustness of the ACSM and its suitability for long-term measurements. Particle mass closure with the PNSD is strongly recommended to ensure the stability of the ACSM. A near real-time mass closure procedure within the entire ACTRIS-ACSM network certainly represents an optimal way of both warranting the quality assurance of the ACSM measurements as well as identifying possible deviations in one of the two instruments.

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Characteristics and temporal variations of organic and elemental carbon aerosols in PM1 in Changchun, Northeast China

Wei

Han

et al. 2020

Environ Sci Pollut Res

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Seasonal changes in the PM1 chemical composition north of Mexico City

Cited by 19 publications

References 12 publications

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

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

Multi-Year ACSM measurements at the Central European Research Station Melpitz (Germany) Part I: Instrument Robustness, Quality Assurance, and Impact of Upper Size Cut-Off Diameter

Characteristics and temporal variations of organic and elemental carbon aerosols in PM1 in Changchun, Northeast China

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