Los Angeles Basin airborne organic aerosol characterization during CalNex

J. S. Craven, A. R. Metcalf, R. Bahreini, A. Middlebrook, P. L. Hayes, H. T. Duong, Armin Sorooshian, J. L. Jimenez, R. C. Flagan, J. H. Seinfeld

Research output: Contribution to journalArticle

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Abstract

We report airborne organic aerosol (OA) measurements over Los Angeles carried out in May 2010 as part of the CalNex field campaign. The principal platform for the airborne data reported here was the CIRPAS Twin Otter (TO); airborne data from NOAA WP-3D aircraft and Pasadena CalNex ground-site data acquired during simultaneous TO flybys are also presented. Aerodyne aerosol mass spectrometer measurements constitute the main source of data analyzed. The increase in organic aerosol oxidation from west to east in the basin was sensitive to OA mass loading, with a greater spatial trend in O:C associated with lower mass concentration. Three positive matrix factorization (PMF) components (hydrocarbon-like organic aerosol (HOA), semi-volatile oxidized organic aerosol (SVOOA), and low volatility oxidized organic aerosol (LVOOA)) were resolved for the one flight that exhibited the largest variability in estimated O:C ratio. Comparison of the PMF factors with two optical modes of refractory black carbon (rBC)-containing aerosol revealed that the coating of thinly coated rBC-containing aerosol, dominant in the downtown region, is likely composed of HOA, whereas more thickly coated rBC-containing aerosol, dominant in the Banning pass outflow, is composed of SVOOA and LVOOA. The correlation of water-soluble organic mass to oxidized organic aerosol (OOA) is higher in the outflows than in the basin due to the higher mass fraction of OOA/OA in the outflows. By comparison, the average OA concentration over Mexico City MILAGRO (Megacity Initiative: Local and Global Research Observations) campaign was ∼7 times higher than the airborne average during CalNex. Key Points Airborne organic aerosol measurements over LA are reported Spatial pattern of O:C depends on amount of organic aerosol present PMF factors are correlated with two modes of rBC containing aerosol

Original languageEnglish (US)
Pages (from-to)11453-11467
Number of pages15
JournalJournal of Geophysical Research: Space Physics
Volume118
Issue number19
DOIs
StatePublished - Oct 16 2013

Fingerprint

Aerosols
aerosols
aerosol
basin
Soot
refractories
black carbon
Refractory materials
Factorization
factorization
outflow
volatility
carbon
Hydrocarbons
matrix
Aerodynes
matrices
hydrocarbons
hydrocarbon
megacity

Keywords

  • airborne
  • Los Angeles
  • organic aerosol
  • PMF

ASJC Scopus subject areas

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

Cite this

Craven, J. S., Metcalf, A. R., Bahreini, R., Middlebrook, A., Hayes, P. L., Duong, H. T., ... Seinfeld, J. H. (2013). Los Angeles Basin airborne organic aerosol characterization during CalNex. Journal of Geophysical Research: Space Physics, 118(19), 11453-11467. https://doi.org/10.1002/jgrd.50853

Los Angeles Basin airborne organic aerosol characterization during CalNex. / Craven, J. S.; Metcalf, A. R.; Bahreini, R.; Middlebrook, A.; Hayes, P. L.; Duong, H. T.; Sorooshian, Armin; Jimenez, J. L.; Flagan, R. C.; Seinfeld, J. H.

In: Journal of Geophysical Research: Space Physics, Vol. 118, No. 19, 16.10.2013, p. 11453-11467.

Research output: Contribution to journalArticle

Craven, JS, Metcalf, AR, Bahreini, R, Middlebrook, A, Hayes, PL, Duong, HT, Sorooshian, A, Jimenez, JL, Flagan, RC & Seinfeld, JH 2013, 'Los Angeles Basin airborne organic aerosol characterization during CalNex', Journal of Geophysical Research: Space Physics, vol. 118, no. 19, pp. 11453-11467. https://doi.org/10.1002/jgrd.50853
Craven JS, Metcalf AR, Bahreini R, Middlebrook A, Hayes PL, Duong HT et al. Los Angeles Basin airborne organic aerosol characterization during CalNex. Journal of Geophysical Research: Space Physics. 2013 Oct 16;118(19):11453-11467. https://doi.org/10.1002/jgrd.50853
Craven, J. S. ; Metcalf, A. R. ; Bahreini, R. ; Middlebrook, A. ; Hayes, P. L. ; Duong, H. T. ; Sorooshian, Armin ; Jimenez, J. L. ; Flagan, R. C. ; Seinfeld, J. H. / Los Angeles Basin airborne organic aerosol characterization during CalNex. In: Journal of Geophysical Research: Space Physics. 2013 ; Vol. 118, No. 19. pp. 11453-11467.
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