On the volatility and production mechanisms of newly formed nitrate and water soluble organic aerosol in Mexico City

C. J. Hennigan, A. P. Sullivan, Christos Fountoukis, A. Nenes, A. Hecobian, O. Vargas, R. E. Peltier, A. T. Case Hanks, L. G. Huey, B. L. Lefer, A. G. Russell, R. J. Weber

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Measurements of atmospheric gases and fine particle chemistry were made in the Mexico City Metropolitan Area (MCMA) at a site ∼30 km down wind of the city center. Ammonium nitrate (NH4NO3) dominated the inorganic aerosol fraction and showed a distinct diurnal signature characterized by rapid morning production and a rapid mid-day concentration decrease. Between the hours of 08:00ĝ€"12:45, particulate water-soluble organic carbon (WSOC) concentrations increased and decreased in a manner consistent with that of NO3 −, and the two were highly correlated (R2=0.88) during this time. A box model was used to analyze these behaviors and showed that, for both NO3 − and WSOC, the concentration increase was caused primarily (∼75ĝ€"85%) by secondary formation, with a smaller contribution (∼15ĝ€"25%) from the entrainment of air from the free troposphere. For NO3 −, a majority (∼60%) of the midday concentration decrease was caused by dilution from boundary layer expansion, though a significant fraction (∼40%) of the NO3 − loss was due to particle evaporation. The WSOC concentration decrease was due largely to dilution (∼75%), but volatilization did have a meaningful impact (∼25%) on the decrease, as well. The results provide an estimate of ambient SOA evaporation losses and suggest that a significant fraction (∼35%) of the fresh MCMA secondary organic aerosol (SOA) measured at the surface volatilized.

Original languageEnglish
Pages (from-to)3761-3768
Number of pages8
JournalAtmospheric Chemistry and Physics
Volume8
Issue number14
Publication statusPublished - 16 Jul 2008
Externally publishedYes

Fingerprint

organic carbon
aerosol
nitrate
metropolitan area
dilution
evaporation
atmospheric gas
ammonium nitrate
volatilization
entrainment
water
troposphere
boundary layer
air
city
volatility
particle
loss
city centre

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Hennigan, C. J., Sullivan, A. P., Fountoukis, C., Nenes, A., Hecobian, A., Vargas, O., ... Weber, R. J. (2008). On the volatility and production mechanisms of newly formed nitrate and water soluble organic aerosol in Mexico City. Atmospheric Chemistry and Physics, 8(14), 3761-3768.

On the volatility and production mechanisms of newly formed nitrate and water soluble organic aerosol in Mexico City. / Hennigan, C. J.; Sullivan, A. P.; Fountoukis, Christos; Nenes, A.; Hecobian, A.; Vargas, O.; Peltier, R. E.; Case Hanks, A. T.; Huey, L. G.; Lefer, B. L.; Russell, A. G.; Weber, R. J.

In: Atmospheric Chemistry and Physics, Vol. 8, No. 14, 16.07.2008, p. 3761-3768.

Research output: Contribution to journalArticle

Hennigan, CJ, Sullivan, AP, Fountoukis, C, Nenes, A, Hecobian, A, Vargas, O, Peltier, RE, Case Hanks, AT, Huey, LG, Lefer, BL, Russell, AG & Weber, RJ 2008, 'On the volatility and production mechanisms of newly formed nitrate and water soluble organic aerosol in Mexico City', Atmospheric Chemistry and Physics, vol. 8, no. 14, pp. 3761-3768.
Hennigan, C. J. ; Sullivan, A. P. ; Fountoukis, Christos ; Nenes, A. ; Hecobian, A. ; Vargas, O. ; Peltier, R. E. ; Case Hanks, A. T. ; Huey, L. G. ; Lefer, B. L. ; Russell, A. G. ; Weber, R. J. / On the volatility and production mechanisms of newly formed nitrate and water soluble organic aerosol in Mexico City. In: Atmospheric Chemistry and Physics. 2008 ; Vol. 8, No. 14. pp. 3761-3768.
@article{2019b9e5d1e74edca5c310d493aa4ce1,
title = "On the volatility and production mechanisms of newly formed nitrate and water soluble organic aerosol in Mexico City",
abstract = "Measurements of atmospheric gases and fine particle chemistry were made in the Mexico City Metropolitan Area (MCMA) at a site ∼30 km down wind of the city center. Ammonium nitrate (NH4NO3) dominated the inorganic aerosol fraction and showed a distinct diurnal signature characterized by rapid morning production and a rapid mid-day concentration decrease. Between the hours of 08:00ĝ€{"}12:45, particulate water-soluble organic carbon (WSOC) concentrations increased and decreased in a manner consistent with that of NO3 −, and the two were highly correlated (R2=0.88) during this time. A box model was used to analyze these behaviors and showed that, for both NO3 − and WSOC, the concentration increase was caused primarily (∼75ĝ€{"}85{\%}) by secondary formation, with a smaller contribution (∼15ĝ€{"}25{\%}) from the entrainment of air from the free troposphere. For NO3 −, a majority (∼60{\%}) of the midday concentration decrease was caused by dilution from boundary layer expansion, though a significant fraction (∼40{\%}) of the NO3 − loss was due to particle evaporation. The WSOC concentration decrease was due largely to dilution (∼75{\%}), but volatilization did have a meaningful impact (∼25{\%}) on the decrease, as well. The results provide an estimate of ambient SOA evaporation losses and suggest that a significant fraction (∼35{\%}) of the fresh MCMA secondary organic aerosol (SOA) measured at the surface volatilized.",
author = "Hennigan, {C. J.} and Sullivan, {A. P.} and Christos Fountoukis and A. Nenes and A. Hecobian and O. Vargas and Peltier, {R. E.} and {Case Hanks}, {A. T.} and Huey, {L. G.} and Lefer, {B. L.} and Russell, {A. G.} and Weber, {R. J.}",
year = "2008",
month = "7",
day = "16",
language = "English",
volume = "8",
pages = "3761--3768",
journal = "Atmospheric Chemistry and Physics",
issn = "1680-7316",
publisher = "European Geosciences Union",
number = "14",

}

TY - JOUR

T1 - On the volatility and production mechanisms of newly formed nitrate and water soluble organic aerosol in Mexico City

AU - Hennigan, C. J.

AU - Sullivan, A. P.

AU - Fountoukis, Christos

AU - Nenes, A.

AU - Hecobian, A.

AU - Vargas, O.

AU - Peltier, R. E.

AU - Case Hanks, A. T.

AU - Huey, L. G.

AU - Lefer, B. L.

AU - Russell, A. G.

AU - Weber, R. J.

PY - 2008/7/16

Y1 - 2008/7/16

N2 - Measurements of atmospheric gases and fine particle chemistry were made in the Mexico City Metropolitan Area (MCMA) at a site ∼30 km down wind of the city center. Ammonium nitrate (NH4NO3) dominated the inorganic aerosol fraction and showed a distinct diurnal signature characterized by rapid morning production and a rapid mid-day concentration decrease. Between the hours of 08:00ĝ€"12:45, particulate water-soluble organic carbon (WSOC) concentrations increased and decreased in a manner consistent with that of NO3 −, and the two were highly correlated (R2=0.88) during this time. A box model was used to analyze these behaviors and showed that, for both NO3 − and WSOC, the concentration increase was caused primarily (∼75ĝ€"85%) by secondary formation, with a smaller contribution (∼15ĝ€"25%) from the entrainment of air from the free troposphere. For NO3 −, a majority (∼60%) of the midday concentration decrease was caused by dilution from boundary layer expansion, though a significant fraction (∼40%) of the NO3 − loss was due to particle evaporation. The WSOC concentration decrease was due largely to dilution (∼75%), but volatilization did have a meaningful impact (∼25%) on the decrease, as well. The results provide an estimate of ambient SOA evaporation losses and suggest that a significant fraction (∼35%) of the fresh MCMA secondary organic aerosol (SOA) measured at the surface volatilized.

AB - Measurements of atmospheric gases and fine particle chemistry were made in the Mexico City Metropolitan Area (MCMA) at a site ∼30 km down wind of the city center. Ammonium nitrate (NH4NO3) dominated the inorganic aerosol fraction and showed a distinct diurnal signature characterized by rapid morning production and a rapid mid-day concentration decrease. Between the hours of 08:00ĝ€"12:45, particulate water-soluble organic carbon (WSOC) concentrations increased and decreased in a manner consistent with that of NO3 −, and the two were highly correlated (R2=0.88) during this time. A box model was used to analyze these behaviors and showed that, for both NO3 − and WSOC, the concentration increase was caused primarily (∼75ĝ€"85%) by secondary formation, with a smaller contribution (∼15ĝ€"25%) from the entrainment of air from the free troposphere. For NO3 −, a majority (∼60%) of the midday concentration decrease was caused by dilution from boundary layer expansion, though a significant fraction (∼40%) of the NO3 − loss was due to particle evaporation. The WSOC concentration decrease was due largely to dilution (∼75%), but volatilization did have a meaningful impact (∼25%) on the decrease, as well. The results provide an estimate of ambient SOA evaporation losses and suggest that a significant fraction (∼35%) of the fresh MCMA secondary organic aerosol (SOA) measured at the surface volatilized.

UR - http://www.scopus.com/inward/record.url?scp=47549107427&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=47549107427&partnerID=8YFLogxK

M3 - Article

VL - 8

SP - 3761

EP - 3768

JO - Atmospheric Chemistry and Physics

JF - Atmospheric Chemistry and Physics

SN - 1680-7316

IS - 14

ER -