Articles | Volume 15, issue 11
https://doi.org/10.5194/acp-15-6283-2015
https://doi.org/10.5194/acp-15-6283-2015
Research article
 | 
09 Jun 2015
Research article |  | 09 Jun 2015

A large and ubiquitous source of atmospheric formic acid

D. B. Millet, M. Baasandorj, D. K. Farmer, J. A. Thornton, K. Baumann, P. Brophy, S. Chaliyakunnel, J. A. de Gouw, M. Graus, L. Hu, A. Koss, B. H. Lee, F. D. Lopez-Hilfiker, J. A. Neuman, F. Paulot, J. Peischl, I. B. Pollack, T. B. Ryerson, C. Warneke, B. J. Williams, and J. Xu

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Dylan Millet on behalf of the Authors (30 Apr 2015)  Author's response   Manuscript 
ED: Publish as is (15 May 2015) by Jonathan Williams
AR by Dylan Millet on behalf of the Authors (15 May 2015)
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Short summary
Formic acid (HCOOH) is an abundant atmospheric acid that affects precipitation chemistry and acidity. HCOOH measurements over the USA are 2-3× larger than can be explained by known sources and sinks, revealing a key gap in current understanding. Observations indicate a large biogenic source plus chemical production across a range of precursors. Model simulations cannot capture the HCOOH diurnal amplitude or nocturnal profile, implying a deposition bias and possibly even larger missing source.
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