Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: Results from the CENICA Supersite

D. Salcedo, T. B. Onasch, K. Dzepina, M. R. Canagaratna, Q. Zhang, J. A. Huffmann, P. F. DeCarlo, J. T. Jayne, P. Mortimer, D. R. Worsnop, C. E. Kolb, K. S. Johnson, B. Zuberi, L. C. Marr, R. Volkamer, L. T. Molina, M. J. Molina, B. Cardenas, R. M. Bernabé, C. MárquezJ. S. Gaffney, N. A. Marley, A. Laskin, V. Shutthanandan, Y. Xie, W. Brune, R. Lesher, T. Shirley, Jose L. Jimenez

Research output: Contribution to journalArticle

188 Citations (Scopus)

Abstract

An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31 March-4 May 2003 to investigate particle concentrations, sources, and processes. The AMS provides real time information on mass concentration and composition of the non-refractory species in particulate matter less than 1 μm (NR-PM1) with high time and size-resolution. In order to account for the refractory material in the aerosol, we also present estimates of Black Carbon (BC) using an aethalometer and an estimate of the aerosol soil component obtained from Proton-Induced X-ray Emission Spectrometry (PIXE) analysis of impactor substrates. Comparisons of AMS + BC + soil mass concentration with other collocated particle instruments (a LASAIR Optical Particle Counter, a PM2.5 Tapered Element Oscillating Microbalance (TEOM), and a PM2.5 DustTrak Aerosol Monitor) show that the AMS + BC + soil mass concentration is consistent with the total PM2.5 mass concentration during MCMA-2003 within the combined uncertainties. In Mexico City, the organic fraction of the estimated PM2.5 at CENICA represents, on average, 54.6% (standard deviation σ=10%) of the mass, with the rest consisting of inorganic compounds (mainly ammonium nitrate and sulfate/ ammonium salts), BC, and soil. Inorganic compounds represent 27.5% of PM2.5 (σ=10%); BC mass concentration is about 11% (σ=4%); while soil represents about 6.9% (σ=4%). Size distributions are presented for the AMS species; they show an accumulation mode that contains mainly oxygenated organic and secondary inorganic compounds. The organic size distributions also contain a small organic particle mode that is likely indicative of fresh traffic emissions; small particle modes exist for the inorganic species as well. Evidence suggests that the organic and inorganic species are not always internally mixed, especially in the small modes. The aerosol seems to be neutralized most of the time; however, there were some periods when there was not enough ammonium to completely neutralize the nitrate, chloride and sulfate present. The diurnal cycle and size distributions of nitrate suggest local photochemical production. On the other hand, sulfate appears to be produced on a regional scale. There are indications of new particle formation and growth events when concentrations of SO2 were high. Although the sources of chloride are not clear, this species seems to condense as ammonium chloride early in the morning and to evaporate as the temperature increases and RH decreases. The total and speciated mass concentrations and diurnal cycles measured during MCMA-2003 are similar to measurements during a previous field campaign at a nearby location.

Original languageEnglish (US)
Pages (from-to)925-946
Number of pages22
JournalAtmospheric Chemistry and Physics
Volume6
Issue number4
DOIs
StatePublished - Jan 1 2006

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mass spectrometry
aerosol
black carbon
spectrometer
inorganic compound
ammonium
chloride
soil
city
sulfate
nitrate
traffic emission
ammonium sulfate
ammonium nitrate
metropolitan area
spectrometry
particle
particulate matter
salt
substrate

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Salcedo, D. ; Onasch, T. B. ; Dzepina, K. ; Canagaratna, M. R. ; Zhang, Q. ; Huffmann, J. A. ; DeCarlo, P. F. ; Jayne, J. T. ; Mortimer, P. ; Worsnop, D. R. ; Kolb, C. E. ; Johnson, K. S. ; Zuberi, B. ; Marr, L. C. ; Volkamer, R. ; Molina, L. T. ; Molina, M. J. ; Cardenas, B. ; Bernabé, R. M. ; Márquez, C. ; Gaffney, J. S. ; Marley, N. A. ; Laskin, A. ; Shutthanandan, V. ; Xie, Y. ; Brune, W. ; Lesher, R. ; Shirley, T. ; Jimenez, Jose L. / Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry : Results from the CENICA Supersite. In: Atmospheric Chemistry and Physics. 2006 ; Vol. 6, No. 4. pp. 925-946.
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title = "Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: Results from the CENICA Supersite",
abstract = "An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31 March-4 May 2003 to investigate particle concentrations, sources, and processes. The AMS provides real time information on mass concentration and composition of the non-refractory species in particulate matter less than 1 μm (NR-PM1) with high time and size-resolution. In order to account for the refractory material in the aerosol, we also present estimates of Black Carbon (BC) using an aethalometer and an estimate of the aerosol soil component obtained from Proton-Induced X-ray Emission Spectrometry (PIXE) analysis of impactor substrates. Comparisons of AMS + BC + soil mass concentration with other collocated particle instruments (a LASAIR Optical Particle Counter, a PM2.5 Tapered Element Oscillating Microbalance (TEOM), and a PM2.5 DustTrak Aerosol Monitor) show that the AMS + BC + soil mass concentration is consistent with the total PM2.5 mass concentration during MCMA-2003 within the combined uncertainties. In Mexico City, the organic fraction of the estimated PM2.5 at CENICA represents, on average, 54.6{\%} (standard deviation σ=10{\%}) of the mass, with the rest consisting of inorganic compounds (mainly ammonium nitrate and sulfate/ ammonium salts), BC, and soil. Inorganic compounds represent 27.5{\%} of PM2.5 (σ=10{\%}); BC mass concentration is about 11{\%} (σ=4{\%}); while soil represents about 6.9{\%} (σ=4{\%}). Size distributions are presented for the AMS species; they show an accumulation mode that contains mainly oxygenated organic and secondary inorganic compounds. The organic size distributions also contain a small organic particle mode that is likely indicative of fresh traffic emissions; small particle modes exist for the inorganic species as well. Evidence suggests that the organic and inorganic species are not always internally mixed, especially in the small modes. The aerosol seems to be neutralized most of the time; however, there were some periods when there was not enough ammonium to completely neutralize the nitrate, chloride and sulfate present. The diurnal cycle and size distributions of nitrate suggest local photochemical production. On the other hand, sulfate appears to be produced on a regional scale. There are indications of new particle formation and growth events when concentrations of SO2 were high. Although the sources of chloride are not clear, this species seems to condense as ammonium chloride early in the morning and to evaporate as the temperature increases and RH decreases. The total and speciated mass concentrations and diurnal cycles measured during MCMA-2003 are similar to measurements during a previous field campaign at a nearby location.",
author = "D. Salcedo and Onasch, {T. B.} and K. Dzepina and Canagaratna, {M. R.} and Q. Zhang and Huffmann, {J. A.} and DeCarlo, {P. F.} and Jayne, {J. T.} and P. Mortimer and Worsnop, {D. R.} and Kolb, {C. E.} and Johnson, {K. S.} and B. Zuberi and Marr, {L. C.} and R. Volkamer and Molina, {L. T.} and Molina, {M. J.} and B. Cardenas and Bernab{\'e}, {R. M.} and C. M{\'a}rquez and Gaffney, {J. S.} and Marley, {N. A.} and A. Laskin and V. Shutthanandan and Y. Xie and W. Brune and R. Lesher and T. Shirley and Jimenez, {Jose L.}",
year = "2006",
month = "1",
day = "1",
doi = "10.5194/acp-6-925-2006",
language = "English (US)",
volume = "6",
pages = "925--946",
journal = "Atmospheric Chemistry and Physics",
issn = "1680-7316",
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Salcedo, D, Onasch, TB, Dzepina, K, Canagaratna, MR, Zhang, Q, Huffmann, JA, DeCarlo, PF, Jayne, JT, Mortimer, P, Worsnop, DR, Kolb, CE, Johnson, KS, Zuberi, B, Marr, LC, Volkamer, R, Molina, LT, Molina, MJ, Cardenas, B, Bernabé, RM, Márquez, C, Gaffney, JS, Marley, NA, Laskin, A, Shutthanandan, V, Xie, Y, Brune, W, Lesher, R, Shirley, T & Jimenez, JL 2006, 'Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: Results from the CENICA Supersite', Atmospheric Chemistry and Physics, vol. 6, no. 4, pp. 925-946. https://doi.org/10.5194/acp-6-925-2006

Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry : Results from the CENICA Supersite. / Salcedo, D.; Onasch, T. B.; Dzepina, K.; Canagaratna, M. R.; Zhang, Q.; Huffmann, J. A.; DeCarlo, P. F.; Jayne, J. T.; Mortimer, P.; Worsnop, D. R.; Kolb, C. E.; Johnson, K. S.; Zuberi, B.; Marr, L. C.; Volkamer, R.; Molina, L. T.; Molina, M. J.; Cardenas, B.; Bernabé, R. M.; Márquez, C.; Gaffney, J. S.; Marley, N. A.; Laskin, A.; Shutthanandan, V.; Xie, Y.; Brune, W.; Lesher, R.; Shirley, T.; Jimenez, Jose L.

In: Atmospheric Chemistry and Physics, Vol. 6, No. 4, 01.01.2006, p. 925-946.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry

T2 - Results from the CENICA Supersite

AU - Salcedo, D.

AU - Onasch, T. B.

AU - Dzepina, K.

AU - Canagaratna, M. R.

AU - Zhang, Q.

AU - Huffmann, J. A.

AU - DeCarlo, P. F.

AU - Jayne, J. T.

AU - Mortimer, P.

AU - Worsnop, D. R.

AU - Kolb, C. E.

AU - Johnson, K. S.

AU - Zuberi, B.

AU - Marr, L. C.

AU - Volkamer, R.

AU - Molina, L. T.

AU - Molina, M. J.

AU - Cardenas, B.

AU - Bernabé, R. M.

AU - Márquez, C.

AU - Gaffney, J. S.

AU - Marley, N. A.

AU - Laskin, A.

AU - Shutthanandan, V.

AU - Xie, Y.

AU - Brune, W.

AU - Lesher, R.

AU - Shirley, T.

AU - Jimenez, Jose L.

PY - 2006/1/1

Y1 - 2006/1/1

N2 - An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31 March-4 May 2003 to investigate particle concentrations, sources, and processes. The AMS provides real time information on mass concentration and composition of the non-refractory species in particulate matter less than 1 μm (NR-PM1) with high time and size-resolution. In order to account for the refractory material in the aerosol, we also present estimates of Black Carbon (BC) using an aethalometer and an estimate of the aerosol soil component obtained from Proton-Induced X-ray Emission Spectrometry (PIXE) analysis of impactor substrates. Comparisons of AMS + BC + soil mass concentration with other collocated particle instruments (a LASAIR Optical Particle Counter, a PM2.5 Tapered Element Oscillating Microbalance (TEOM), and a PM2.5 DustTrak Aerosol Monitor) show that the AMS + BC + soil mass concentration is consistent with the total PM2.5 mass concentration during MCMA-2003 within the combined uncertainties. In Mexico City, the organic fraction of the estimated PM2.5 at CENICA represents, on average, 54.6% (standard deviation σ=10%) of the mass, with the rest consisting of inorganic compounds (mainly ammonium nitrate and sulfate/ ammonium salts), BC, and soil. Inorganic compounds represent 27.5% of PM2.5 (σ=10%); BC mass concentration is about 11% (σ=4%); while soil represents about 6.9% (σ=4%). Size distributions are presented for the AMS species; they show an accumulation mode that contains mainly oxygenated organic and secondary inorganic compounds. The organic size distributions also contain a small organic particle mode that is likely indicative of fresh traffic emissions; small particle modes exist for the inorganic species as well. Evidence suggests that the organic and inorganic species are not always internally mixed, especially in the small modes. The aerosol seems to be neutralized most of the time; however, there were some periods when there was not enough ammonium to completely neutralize the nitrate, chloride and sulfate present. The diurnal cycle and size distributions of nitrate suggest local photochemical production. On the other hand, sulfate appears to be produced on a regional scale. There are indications of new particle formation and growth events when concentrations of SO2 were high. Although the sources of chloride are not clear, this species seems to condense as ammonium chloride early in the morning and to evaporate as the temperature increases and RH decreases. The total and speciated mass concentrations and diurnal cycles measured during MCMA-2003 are similar to measurements during a previous field campaign at a nearby location.

AB - An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31 March-4 May 2003 to investigate particle concentrations, sources, and processes. The AMS provides real time information on mass concentration and composition of the non-refractory species in particulate matter less than 1 μm (NR-PM1) with high time and size-resolution. In order to account for the refractory material in the aerosol, we also present estimates of Black Carbon (BC) using an aethalometer and an estimate of the aerosol soil component obtained from Proton-Induced X-ray Emission Spectrometry (PIXE) analysis of impactor substrates. Comparisons of AMS + BC + soil mass concentration with other collocated particle instruments (a LASAIR Optical Particle Counter, a PM2.5 Tapered Element Oscillating Microbalance (TEOM), and a PM2.5 DustTrak Aerosol Monitor) show that the AMS + BC + soil mass concentration is consistent with the total PM2.5 mass concentration during MCMA-2003 within the combined uncertainties. In Mexico City, the organic fraction of the estimated PM2.5 at CENICA represents, on average, 54.6% (standard deviation σ=10%) of the mass, with the rest consisting of inorganic compounds (mainly ammonium nitrate and sulfate/ ammonium salts), BC, and soil. Inorganic compounds represent 27.5% of PM2.5 (σ=10%); BC mass concentration is about 11% (σ=4%); while soil represents about 6.9% (σ=4%). Size distributions are presented for the AMS species; they show an accumulation mode that contains mainly oxygenated organic and secondary inorganic compounds. The organic size distributions also contain a small organic particle mode that is likely indicative of fresh traffic emissions; small particle modes exist for the inorganic species as well. Evidence suggests that the organic and inorganic species are not always internally mixed, especially in the small modes. The aerosol seems to be neutralized most of the time; however, there were some periods when there was not enough ammonium to completely neutralize the nitrate, chloride and sulfate present. The diurnal cycle and size distributions of nitrate suggest local photochemical production. On the other hand, sulfate appears to be produced on a regional scale. There are indications of new particle formation and growth events when concentrations of SO2 were high. Although the sources of chloride are not clear, this species seems to condense as ammonium chloride early in the morning and to evaporate as the temperature increases and RH decreases. The total and speciated mass concentrations and diurnal cycles measured during MCMA-2003 are similar to measurements during a previous field campaign at a nearby location.

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