Composition and hygroscopicity of the Los Angeles Aerosol: CalNex

Scott P. Hersey, Jill S. Craven, Andrew R. Metcalf, Jack Lin, Terry Lathem, Kaitlyn J. Suski, John F. Cahill, Hanh T. Duong, Armin Sorooshian, Haflidi H. Jonsson, Manabu Shiraiwa, Andreas Zuend, Athanasios Nenes, Kimberly A. Prather, Richard C. Flagan, John H. Seinfeld

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Aircraft-based measurements of aerosol composition, either bulk or single-particle, and both subsaturated and supersaturated hygroscopicity were made in the Los Angeles Basin and its outflows during May 2010 during the CalNex field study. Aerosol composition evolves from source-rich areas in the western Basin to downwind sites in the eastern Basin, evidenced by transition from an external to internal mixture, as well as enhancements in organic O: C ratio, the amount of organics and nitrate internally mixed on almost all particle types, and coating thickness on refractory black carbon (rBC). Transport into hot, dilute outflow regions leads to significant volatilization of semivolatile material, resulting in a unimodal aerosol comprising primarily oxygenated, low-volatility, water-soluble organics and sulfate. The fraction of particles with rBC or soot cores is between 27 and 51% based on data from a Single Particle Soot Photometer (SP2) and Aerosol Time of Flight Mass Spectrometer (ATOFMS). Secondary organics appear to inhibit subsaturated water uptake in aged particles, while CCN activity is enhanced with photochemical age. A biomass-burning event resulted in suppression of subsaturated hygroscopicity but enhancement in CCN activity, suggesting that BB particles may be nonhygroscopic at subsaturated RH but are important sources of CCN. Aerosol aging and biomass burning can lead to discrepancies between subsaturated and supersaturated hygroscopicity that may be related to mixing state. In the cases of biomass burning aerosol and aged particles coated with secondary material, more than a single parameter representation of subsaturated hygroscopicity and CCN activity is needed.

Original languageEnglish (US)
Pages (from-to)3016-3036
Number of pages21
JournalJournal of Geophysical Research: Space Physics
Volume118
Issue number7
DOIs
StatePublished - Apr 16 2013

Fingerprint

hygroscopicity
Aerosols
Soot
aerosols
aerosol
biomass burning
Chemical analysis
Biomass
aerosol composition
Refractory materials
soot
refractories
black carbon
Sulfuric Acid Esters
outflow
Photometers
basin
Water
Mass spectrometers
vaporizing

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Hersey, S. P., Craven, J. S., Metcalf, A. R., Lin, J., Lathem, T., Suski, K. J., ... Seinfeld, J. H. (2013). Composition and hygroscopicity of the Los Angeles Aerosol: CalNex. Journal of Geophysical Research: Space Physics, 118(7), 3016-3036. https://doi.org/10.1002/jgrd.50307

Composition and hygroscopicity of the Los Angeles Aerosol : CalNex. / Hersey, Scott P.; Craven, Jill S.; Metcalf, Andrew R.; Lin, Jack; Lathem, Terry; Suski, Kaitlyn J.; Cahill, John F.; Duong, Hanh T.; Sorooshian, Armin; Jonsson, Haflidi H.; Shiraiwa, Manabu; Zuend, Andreas; Nenes, Athanasios; Prather, Kimberly A.; Flagan, Richard C.; Seinfeld, John H.

In: Journal of Geophysical Research: Space Physics, Vol. 118, No. 7, 16.04.2013, p. 3016-3036.

Research output: Contribution to journalArticle

Hersey, SP, Craven, JS, Metcalf, AR, Lin, J, Lathem, T, Suski, KJ, Cahill, JF, Duong, HT, Sorooshian, A, Jonsson, HH, Shiraiwa, M, Zuend, A, Nenes, A, Prather, KA, Flagan, RC & Seinfeld, JH 2013, 'Composition and hygroscopicity of the Los Angeles Aerosol: CalNex', Journal of Geophysical Research: Space Physics, vol. 118, no. 7, pp. 3016-3036. https://doi.org/10.1002/jgrd.50307
Hersey SP, Craven JS, Metcalf AR, Lin J, Lathem T, Suski KJ et al. Composition and hygroscopicity of the Los Angeles Aerosol: CalNex. Journal of Geophysical Research: Space Physics. 2013 Apr 16;118(7):3016-3036. https://doi.org/10.1002/jgrd.50307
Hersey, Scott P. ; Craven, Jill S. ; Metcalf, Andrew R. ; Lin, Jack ; Lathem, Terry ; Suski, Kaitlyn J. ; Cahill, John F. ; Duong, Hanh T. ; Sorooshian, Armin ; Jonsson, Haflidi H. ; Shiraiwa, Manabu ; Zuend, Andreas ; Nenes, Athanasios ; Prather, Kimberly A. ; Flagan, Richard C. ; Seinfeld, John H. / Composition and hygroscopicity of the Los Angeles Aerosol : CalNex. In: Journal of Geophysical Research: Space Physics. 2013 ; Vol. 118, No. 7. pp. 3016-3036.
@article{2cb11f0135c04a0487720784ebe135e1,
title = "Composition and hygroscopicity of the Los Angeles Aerosol: CalNex",
abstract = "Aircraft-based measurements of aerosol composition, either bulk or single-particle, and both subsaturated and supersaturated hygroscopicity were made in the Los Angeles Basin and its outflows during May 2010 during the CalNex field study. Aerosol composition evolves from source-rich areas in the western Basin to downwind sites in the eastern Basin, evidenced by transition from an external to internal mixture, as well as enhancements in organic O: C ratio, the amount of organics and nitrate internally mixed on almost all particle types, and coating thickness on refractory black carbon (rBC). Transport into hot, dilute outflow regions leads to significant volatilization of semivolatile material, resulting in a unimodal aerosol comprising primarily oxygenated, low-volatility, water-soluble organics and sulfate. The fraction of particles with rBC or soot cores is between 27 and 51{\%} based on data from a Single Particle Soot Photometer (SP2) and Aerosol Time of Flight Mass Spectrometer (ATOFMS). Secondary organics appear to inhibit subsaturated water uptake in aged particles, while CCN activity is enhanced with photochemical age. A biomass-burning event resulted in suppression of subsaturated hygroscopicity but enhancement in CCN activity, suggesting that BB particles may be nonhygroscopic at subsaturated RH but are important sources of CCN. Aerosol aging and biomass burning can lead to discrepancies between subsaturated and supersaturated hygroscopicity that may be related to mixing state. In the cases of biomass burning aerosol and aged particles coated with secondary material, more than a single parameter representation of subsaturated hygroscopicity and CCN activity is needed.",
author = "Hersey, {Scott P.} and Craven, {Jill S.} and Metcalf, {Andrew R.} and Jack Lin and Terry Lathem and Suski, {Kaitlyn J.} and Cahill, {John F.} and Duong, {Hanh T.} and Armin Sorooshian and Jonsson, {Haflidi H.} and Manabu Shiraiwa and Andreas Zuend and Athanasios Nenes and Prather, {Kimberly A.} and Flagan, {Richard C.} and Seinfeld, {John H.}",
year = "2013",
month = "4",
day = "16",
doi = "10.1002/jgrd.50307",
language = "English (US)",
volume = "118",
pages = "3016--3036",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
publisher = "Wiley-Blackwell",
number = "7",

}

TY - JOUR

T1 - Composition and hygroscopicity of the Los Angeles Aerosol

T2 - CalNex

AU - Hersey, Scott P.

AU - Craven, Jill S.

AU - Metcalf, Andrew R.

AU - Lin, Jack

AU - Lathem, Terry

AU - Suski, Kaitlyn J.

AU - Cahill, John F.

AU - Duong, Hanh T.

AU - Sorooshian, Armin

AU - Jonsson, Haflidi H.

AU - Shiraiwa, Manabu

AU - Zuend, Andreas

AU - Nenes, Athanasios

AU - Prather, Kimberly A.

AU - Flagan, Richard C.

AU - Seinfeld, John H.

PY - 2013/4/16

Y1 - 2013/4/16

N2 - Aircraft-based measurements of aerosol composition, either bulk or single-particle, and both subsaturated and supersaturated hygroscopicity were made in the Los Angeles Basin and its outflows during May 2010 during the CalNex field study. Aerosol composition evolves from source-rich areas in the western Basin to downwind sites in the eastern Basin, evidenced by transition from an external to internal mixture, as well as enhancements in organic O: C ratio, the amount of organics and nitrate internally mixed on almost all particle types, and coating thickness on refractory black carbon (rBC). Transport into hot, dilute outflow regions leads to significant volatilization of semivolatile material, resulting in a unimodal aerosol comprising primarily oxygenated, low-volatility, water-soluble organics and sulfate. The fraction of particles with rBC or soot cores is between 27 and 51% based on data from a Single Particle Soot Photometer (SP2) and Aerosol Time of Flight Mass Spectrometer (ATOFMS). Secondary organics appear to inhibit subsaturated water uptake in aged particles, while CCN activity is enhanced with photochemical age. A biomass-burning event resulted in suppression of subsaturated hygroscopicity but enhancement in CCN activity, suggesting that BB particles may be nonhygroscopic at subsaturated RH but are important sources of CCN. Aerosol aging and biomass burning can lead to discrepancies between subsaturated and supersaturated hygroscopicity that may be related to mixing state. In the cases of biomass burning aerosol and aged particles coated with secondary material, more than a single parameter representation of subsaturated hygroscopicity and CCN activity is needed.

AB - Aircraft-based measurements of aerosol composition, either bulk or single-particle, and both subsaturated and supersaturated hygroscopicity were made in the Los Angeles Basin and its outflows during May 2010 during the CalNex field study. Aerosol composition evolves from source-rich areas in the western Basin to downwind sites in the eastern Basin, evidenced by transition from an external to internal mixture, as well as enhancements in organic O: C ratio, the amount of organics and nitrate internally mixed on almost all particle types, and coating thickness on refractory black carbon (rBC). Transport into hot, dilute outflow regions leads to significant volatilization of semivolatile material, resulting in a unimodal aerosol comprising primarily oxygenated, low-volatility, water-soluble organics and sulfate. The fraction of particles with rBC or soot cores is between 27 and 51% based on data from a Single Particle Soot Photometer (SP2) and Aerosol Time of Flight Mass Spectrometer (ATOFMS). Secondary organics appear to inhibit subsaturated water uptake in aged particles, while CCN activity is enhanced with photochemical age. A biomass-burning event resulted in suppression of subsaturated hygroscopicity but enhancement in CCN activity, suggesting that BB particles may be nonhygroscopic at subsaturated RH but are important sources of CCN. Aerosol aging and biomass burning can lead to discrepancies between subsaturated and supersaturated hygroscopicity that may be related to mixing state. In the cases of biomass burning aerosol and aged particles coated with secondary material, more than a single parameter representation of subsaturated hygroscopicity and CCN activity is needed.

UR - http://www.scopus.com/inward/record.url?scp=84880272954&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84880272954&partnerID=8YFLogxK

U2 - 10.1002/jgrd.50307

DO - 10.1002/jgrd.50307

M3 - Article

AN - SCOPUS:84880272954

VL - 118

SP - 3016

EP - 3036

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 7

ER -