Pyruvic acid in the boreal forest: gas-phase mixing ratios and impact on radical chemistry
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Published:2020-03-27
Issue:6
Volume:20
Page:3697-3711
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Eger Philipp G.ORCID, Schuladen Jan, Sobanski Nicolas, Fischer Horst, Karu Einar, Williams Jonathan, Riva MatthieuORCID, Zha Qiaozhi, Ehn MikaelORCID, Quéléver Lauriane L. J., Schallhart Simon, Lelieveld JosORCID, Crowley John N.ORCID
Abstract
Abstract. Pyruvic acid (CH3C(O)C(O)OH, 2-oxopropanoic acid) is an organic acid of
biogenic origin that plays a crucial role in plant metabolism, is present in
tropospheric air in both gas-phase and aerosol-phase, and is implicated in
the formation of secondary organic aerosols (SOAs). Up to now, only a few
field studies have reported mixing ratios of gas-phase pyruvic acid, and its
tropospheric sources and sinks are poorly constrained. We present the first
measurements of gas-phase pyruvic acid in the boreal forest as part of the
IBAIRN (Influence of Biosphere–Atmosphere Interactions on the
Reactive Nitrogen budget) field campaign in Hyytiälä, Finland, in
September 2016. The mean pyruvic acid mixing ratio during IBAIRN was 96 pptv, with a maximum value of 327 pptv. From our measurements we estimated
the overall pyruvic acid source strength and quantified the contributions of
isoprene oxidation and direct emissions from vegetation in this
monoterpene-dominated forested environment. Further, we discuss the
relevance of gas-phase pyruvic acid for atmospheric chemistry by
investigating the impact of its photolysis on acetaldehyde and peroxy
radical production rates. Our results show that, based on our present
understanding of its photochemistry, pyruvic acid is an important source of
acetaldehyde in the boreal environment, exceeding ethane and propane oxidation
by factors of ∼10 and ∼20.
Funder
European Commission
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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