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Importance of secondary sources in the atmospheric budgets of formic and acetic acids

2011; Copernicus Publications; Volume: 11; Issue: 5 Linguagem: Inglês

10.5194/acp-11-1989-2011

1680-7324

Fabien Paulot, Debra Wunch, J. D. Crounse, Geoffrey C. Toon, Dylan B. Millet, P. F. DeCarlo, Corinne Vigouroux, Nicholas M. Deutscher, Gonzalo González Abad, Justus Notholt, Thorsten Warneke, James W. Hannigan, C. Warneke, J. A. de Gouw, E. J. Dunlea, Martine De Mazière, David Griffith, P. F. Bernath, J. L. Jiménez, P. O. Wennberg,

Atmospheric and Environmental Gas Dynamics

Abstract. We present a detailed budget of formic and acetic acids, two of the most abundant trace gases in the atmosphere. Our bottom-up estimate of the global source of formic and acetic acids are ~1200 and ~1400 Gmol yr−1, dominated by photochemical oxidation of biogenic volatile organic compounds, in particular isoprene. Their sinks are dominated by wet and dry deposition. We use the GEOS-Chem chemical transport model to evaluate this budget against an extensive suite of measurements from ground, ship and satellite-based Fourier transform spectrometers, as well as from several aircraft campaigns over North America. The model captures the seasonality of formic and acetic acids well but generally underestimates their concentration, particularly in the Northern midlatitudes. We infer that the source of both carboxylic acids may be up to 50% greater than our estimate and report evidence for a long-lived missing secondary source of carboxylic acids that may be associated with the aging of organic aerosols. Vertical profiles of formic acid in the upper troposphere support a negative temperature dependence of the reaction between formic acid and the hydroxyl radical as suggested by several theoretical studies.