Articles | Volume 15, issue 11
Atmos. Chem. Phys., 15, 6283–6304, 2015
Atmos. Chem. Phys., 15, 6283–6304, 2015

Research article 09 Jun 2015

Research article | 09 Jun 2015

A large and ubiquitous source of atmospheric formic acid

D. B. Millet et al.


Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

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
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.
Final-revised paper