Articles | Volume 15, issue 11
Atmos. Chem. Phys., 15, 6283–6304, 2015
https://doi.org/10.5194/acp-15-6283-2015
Atmos. Chem. Phys., 15, 6283–6304, 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 et al.

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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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