Particulate organic acids and overall water-soluble aerosol composition measurements from the 2006 Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS)

Armin Sorooshian, Nga L. Ng, Arthur W H Chan, Graham Feingold, Richard C. Flagan, John H. Seinfeld

Research output: Contribution to journalArticle

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Abstract

The Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) Twin Otter participated in the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) mission during August-September 2006. A particle-into-liquid sampler (PILS) coupled to ion chromatography was used to characterize the water-soluble ion composition of aerosol and cloud droplet residual particles (976 5-min PM1.0 samples in total). Sulfate and ammonium dominated the water-soluble mass (NH4+ + SO42 = 84 ± 14%), while organic acids contributed 3.4 ± 3.7%. The average NH4+: SO42- molar ratio was 1.77 ± 0.85. Particulate concentrations of organic acids increased with decreasing carbon number from C9 to C2. Organic acids were most abundant above cloud, presumably as a result of aqueous phase chemistry in cloud droplets, followed by subsequent droplet evaporation above cloud tops; the main product of this chemistry was oxalic acid. The evolution of organic acids with increasing altitude in cloud provides evidence for the multistep nature of oxalic acid production; predictions from a cloud parcel model are consistent with the observed oxalate:glyoxylate ratio as a function of altitude in GoMACCS cumuli. Suppressed organic acid formation was observed in clouds with relatively acidic droplets, as determined by high particulate nitrate concentrations (presumably high HNO3 levels too) and lower liquid water content, as compared to other cloud fields probed. In the Houston Ship Channel region, an area with significant volatile organic compound emissions, oxalate, acetate, formate, benzoate, and pyruvate, in decreasing order, were the most abundant organic acids. Photo-oxidation of m-xylene in laboratory chamber experiments leads to a particulate organic acid product distribution consistent with the Ship Channel area observations.

Original languageEnglish (US)
Article numberD13201
JournalJournal of Geophysical Research: Space Physics
Volume112
Issue number13
DOIs
StatePublished - Jul 16 2007
Externally publishedYes

Fingerprint

Atmospheric composition
atmospheric composition
aerosol composition
Gulf of Mexico
Organic acids
Aerosols
organic acid
particulates
climate
aerosols
acids
Water
Chemical analysis
water
oxalic acid
Oxalic Acid
cloud droplet
formic acid
oxalate
Oxalates

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Particulate organic acids and overall water-soluble aerosol composition measurements from the 2006 Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS). / Sorooshian, Armin; Ng, Nga L.; Chan, Arthur W H; Feingold, Graham; Flagan, Richard C.; Seinfeld, John H.

In: Journal of Geophysical Research: Space Physics, Vol. 112, No. 13, D13201, 16.07.2007.

Research output: Contribution to journalArticle

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