On the source of organic acid aerosol layers above clouds

Armin Sorooshian, Miao Ling Lu, Fred J. Brechtel, Haflidi Jonsson, Graham Feingold, Richard C. Flagan, John H. Seinfeld

Research output: Contribution to journalArticle

107 Citations (Scopus)

Abstract

During the July 2005 Marine Stratus/Stratocumulus Experiment (MASE) and the August-September 2006 Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS), the Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) Twin Otter probed aerosols and cumulus clouds in the eastern Pacific Ocean off the coast of northern California and in southeastern Texas, respectively. An on-board particle-into-liquid sampler (PILS) quantified inorganic and organic acid species with ≤5-min time resolution. Ubiquitous organic aerosol layers above cloud with enhanced organic acid levels were observed in both locations. The data suggest that aqueous-phase reactions to produce organic acids, mainly oxalic acid, followed by droplet evaporation is a source of elevated organic acid aerosol levels above cloud. Oxalic acid is observed to be produced more efficiently relative to sulfate as the cloud liquid water content increases, corresponding to larger and less acidic droplets. As derived from large eddy simulations of stratocumulus under the conditions of MASE, both Lagrangian trajectory analysis and diurnal cloudtop evolution provide evidence that a significant fraction of the aerosol mass concentration above cloud can be accounted for by evaporated droplet residual particles. Methanesulfonate data suggest that entrainment of free tropospheric aerosol can also be a source of organic acids above boundary layer clouds.

Original languageEnglish (US)
Pages (from-to)4647-4654
Number of pages8
JournalEnvironmental Science and Technology
Volume41
Issue number13
DOIs
StatePublished - Jul 1 2007
Externally publishedYes

Fingerprint

Organic acids
Aerosols
organic acid
aerosol
stratocumulus
droplet
Oxalic Acid
stratus
Oxalic acid
oxalic acid
Atmospheric composition
Particle board
Inorganic acids
inorganic acid
liquid
large eddy simulation
Liquids
Large eddy simulation
cumulus
entrainment

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Sorooshian, A., Lu, M. L., Brechtel, F. J., Jonsson, H., Feingold, G., Flagan, R. C., & Seinfeld, J. H. (2007). On the source of organic acid aerosol layers above clouds. Environmental Science and Technology, 41(13), 4647-4654. https://doi.org/10.1021/es0630442

On the source of organic acid aerosol layers above clouds. / Sorooshian, Armin; Lu, Miao Ling; Brechtel, Fred J.; Jonsson, Haflidi; Feingold, Graham; Flagan, Richard C.; Seinfeld, John H.

In: Environmental Science and Technology, Vol. 41, No. 13, 01.07.2007, p. 4647-4654.

Research output: Contribution to journalArticle

Sorooshian, A, Lu, ML, Brechtel, FJ, Jonsson, H, Feingold, G, Flagan, RC & Seinfeld, JH 2007, 'On the source of organic acid aerosol layers above clouds', Environmental Science and Technology, vol. 41, no. 13, pp. 4647-4654. https://doi.org/10.1021/es0630442
Sorooshian A, Lu ML, Brechtel FJ, Jonsson H, Feingold G, Flagan RC et al. On the source of organic acid aerosol layers above clouds. Environmental Science and Technology. 2007 Jul 1;41(13):4647-4654. https://doi.org/10.1021/es0630442
Sorooshian, Armin ; Lu, Miao Ling ; Brechtel, Fred J. ; Jonsson, Haflidi ; Feingold, Graham ; Flagan, Richard C. ; Seinfeld, John H. / On the source of organic acid aerosol layers above clouds. In: Environmental Science and Technology. 2007 ; Vol. 41, No. 13. pp. 4647-4654.
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