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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-444
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 May 2018

Research article | 14 May 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Distributions and sources of gaseous and particulate low molecular weight monocarboxylic acids in a deciduous broadleaf forest from northern Japan

Tomoki Mochizuki1,a, Kimitaka Kawamura1,b, Yuzo Miyazaki1, and Suresh K. R. Boreddy1 Tomoki Mochizuki et al.
  • 1Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan
  • anow at: School of Food and Nutritional Science, University of Shizuoka, Shizuoka, Japan
  • bnow at: Chubu Institute for Advanced Studies, Chubu University, Kasugai, Japan

Abstract. To better understand the distributions of low molecular weight (LMW) monocarboxylic acids (monoacids) and their sources in the forest, we conducted simultaneous collection of gaseous and particulate samples at a deciduous broadleaf forest site in northern Japan. LMW normal (C1–C10), branched chain (iC4–iC6), hydroxyl (lactic and glycolic) and aromatic (benzoic) monoacids were detected in the gas and particle phases. The dominant LMW monoacids in gas phase were formic (mean: 953ngm−3) and acetic (528ngm−3) acids. In particle phase, we found that isopentanoic (159ngm−3) and acetic (104ngm−3) acids are dominant species together with lactic acid. Concentrations of LMW monoacids did not correlate with SO42− that was used as an anthropogenic tracer, indicating that LMW monoacids are derived from the local sources within the forest ecosystem. Concentrations of C1–C6 monoacids in gas phase showed positive correlations (r2=0.21–0.91) with isobutyric acid (iC4), which is produced by soil microorganisms. These monoacids are closely linked to the microbial process in soils. Isopentanoic acid in particle phase showed a positive correlation with lactic acid (r2=0.98), which is produced by soil microbes. The observed high abundances of isopentanoic acid are involved with soil microbial activity. We found that acetic acid in particle phase positively correlated with nonanoic acid (C9) (r2=0.63), suggesting that formation of acetic and nonanoic acids are associated with the oxidation of unsaturated fatty acids. We found that forest floor with soil microbes contributes to the emissions of gaseous and particulate LMW monoacids. Our results suggest that forest ecosystem is an important source of organic gases and aerosols in the atmosphere.

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Short summary
Monocarboxylic acids (MCAs) in gases and particles were measured in deciduous forest. Formic acid in gas phase and isopentanoic acid in particle phase were dominant MCAs. Gaseous normal monoacids showed positive correlations with isobutyric acid. Particulate isopentanoic acid showed a positive correlation with lactic acid. Forest floor with soil microbes contributes to the emissions of MCAs. Our results may be useful to improve the understanding of organic aerosol formation in the forest.
Monocarboxylic acids (MCAs) in gases and particles were measured in deciduous forest. Formic...
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