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Atmos Chem Phys

Title:		Importance of secondary sources in the atmospheric budgets of formic and acetic acids
Author(s):		Paulot F; Wunch D; Crounse JD; Toon GC; Millet DB; DeCarlo PF; Vigouroux C; Deutscher NM; Gonzalez Abad G; Notholt J; Warneke T; Hannigan JW; Warneke C; de Gouw JA; Dunlea EJ; De Maziere M; Griffith DWT; Bernath P; Jimenez JL; Wennberg PO;
Address:		"Division of Engineering and Applied Sciences, California Institute of Technology, Pasadena, California, USA. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, USA. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA. University of Minnesota, Department of Soil, Water and Climate, St. Paul, Minnesota, USA. Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Colorado, USA. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA. Belgian Institute for Space Aeronomy, Brussels, Belgium. School of Chemistry, University of Wollongong, Wollongong, Australia. Department of Chemistry, University of York, York, UK. Institute of Environmental Physics, Bremen, Germany. National Center for Atmospheric Research, Boulder, Colorado, USA. Earth System Research Laboratory, Chemical Sciences Division, NOAA, Boulder, Colorado, USA. Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado, USA"
Journal Title:		Atmos Chem Phys
Year:		2011
Volume:		20110204
Issue:		5
Page Number:		1989 - 2013
DOI:		10.5194/acp-11-1989-2011
ISSN/ISBN:		1680-7316 (Print) 1680-7324 (Electronic) 1680-7316 (Linking)
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 approximately 1200 and approximately 1400Gmolyr(-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"
Keywords:
Notes:		"PubMed-not-MEDLINEPaulot, F Wunch, D Crounse, J D Toon, G C Millet, D B DeCarlo, P F Vigouroux, C Deutscher, N M Gonzalez Abad, G Notholt, J Warneke, T Hannigan, J W Warneke, C de Gouw, J A Dunlea, E J De Maziere, M Griffith, D W T Bernath, P Jimenez, J L Wennberg, P O eng NNX10AG65G/NASA/NASA/ Germany 2011/03/01 Atmos Chem Phys. 2011 Mar; 11(5):1989-2013. doi: 10.5194/acp-11-1989-2011. Epub 2011 Feb 4"