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Dicarboxylic acids, oxocarboxylic acids and alpha-dicarbonyls in atmospheric aerosols from Mt. Fuji, Japan: Implication for primary emission versus secondary formation
| Title: | Dicarboxylic acids, oxocarboxylic acids and alpha-dicarbonyls in atmospheric aerosols from Mt. Fuji, Japan: Implication for primary emission versus secondary formation |
| Authors: | Kunwar, Bhagawati Browse this author | | Kawamura, Kimitaka Browse this author →KAKEN DB | | Fujiwara, Shintaro Browse this author | | Fu, Pingqing Browse this author | | Miyazaki, Yuzo Browse this author →KAKEN DB | | Pokhrel, Ambarish Browse this author |
| Keywords: | Diacids | | Oxoacids | | alpha-Dicarbonyls | | Acid-catalyzed heterogeneous reaction | | Mt. Fuji |
| Issue Date: | 1-Jun-2019 |
| Publisher: | Elsevier |
| Journal Title: | Atmospheric research |
| Volume: | 221 |
| Start Page: | 58 |
| End Page: | 71 |
| Publisher DOI: | 10.1016/j.atmosres.2019.01.021 |
| Abstract: | Aerosol samples were collected at the summit of Mt. Fuji in July-August 2009 and analyzed for diacids and related compounds together with major ions to decipher the sources and formation process of organic aerosols in the free troposphere. Molecular distributions of diacids showed the predominance of oxalic acid (C-2) followed by succinic (C-4) and malonic (C-3) acids. The average concentration of total diacids is ten times higher in whole-day samples than night-only samples due to the uplift of planetary boundary layer in daytime, suggesting the day-time formation of diacids in the uplifted ground-level air mass along the mountain slope. A strong correlation is found between C-4 and levoglucosan in whole-day and nighttime samples. Liquid water content (LWC) shows strong correlations in nighttime with anthropogenic and biogenic secondary organic aerosol (SOA) tracers (e.g., adipic (0.90, p < 0.05) and phthalic acids (0.93, p < 0.05) and 3-methyl 2,3,4-trihydroxy-1-butene (0.95, p < 0.05), suggesting that aqueous-phase chemistry is important for the formation of water-soluble organic aerosols in the free troposphere. In whole-day samples, LWC is strongly correlated with organic carbon (r = 0.97, p < 0.05), and isoprene-SOA tracers such as methylthreitol (0.96, p < 0.05), methylerythritol (0.97, p < 0.05), 2-methylglyceric acid (0.94, p < 0.05) and glycolic acid (0.98, p < 0.05), suggesting that daytime SOAs are mainly from the oxidation of isoprene emitted from the regional forests on the foothill of Mt. Fuji. A strong correlation between LWC and glycolic acid further suggests that isoprene is the main precursor for the production of oxalic acid via glycolic acid as intermediate. This study supports the heterogeneous formation of diacids in the free troposphere. |
| Rights: | © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/81607 |
| Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 河村 公隆
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