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Impact of biogenic emissions of organic matter from a cool-temperate forest on aerosol optical properties

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Title: Impact of biogenic emissions of organic matter from a cool-temperate forest on aerosol optical properties
Authors: Muller, Astrid Browse this author
Aoki, Kazuma Browse this author
Tachibana, Eri Browse this author
Hiura, Tsutom Browse this author
Miyazaki, Yuzo Browse this author →KAKEN DB
Keywords: Biogenic secondary organic aerosols
Aerosol optical properties
Water-soluble aerosols
Sky radiometer
Issue Date: 15-May-2020
Publisher: Elsevier
Journal Title: Atmospheric environment
Volume: 229
Start Page: 117413
Publisher DOI: 10.1016/j.atmosenv.2020.117413
Abstract: Terrestrial biogenic emissions of organic matter can affect the optical properties of atmospheric aerosols and thus impact the radiation budget. To investigate this, the chemical parameters of submicrometer water-soluble aerosols (WSA) collected on filters were compared to optical properties measured by a sky radiometer at a cool-temperate forest site in northern Japan. From June to December 2015, the WSA samples were collected within the forest canopy, while aerosol optical depth (AOD), single scattering albedo (SSA), absorption Angstrom exponent (AAE), and scattering Angstrom exponent (SAE) were retrieved above the canopy. The optical properties were compared with the filter-based chemical parameters only when the vertical transport of aerosol particles from the forest canopy to the air above it was significant. The result showed that the AOD and the mass concentrations of WSA exhibited similar and distinct seasonal variations with peaks in summer and autumn. In summer, sulfate accounted for 60% of the mass of WSA, which was linked to a high SSA (>0.95), low AAE (1.15 +/- 0.84), and low SAE (1.25 +/- 0.22). In contrast, water-soluble organic matter (WSOM) accounted for 70% of the mass of WSA in autumn. This large fraction of WSOM was associated with a decrease in SSA (0.90-0.95) and an increase in AAE (2.45 +/- 0.91) and SAE (1.46 +/- 0.15). The results suggest that in summer, aerosol particles with a greater size range corresponded to aerosol chemical compositions dominated by sulfate. In contrast, smaller particles with a strong light absorption at shorter wavelengths, were likely important in autumn and associated with a composition dominated by WSOM. The majority of WSOM in autumn has previously been associated with emissions of a-pinene from the forest floor and the subsequent formation of biogenic secondary organic aerosols (BSOA). This study indicates that a-pinene-derived SOAs, mostly originating from the forest floor, were associated with a summer to autumn decrease in SSA. This process can modulate the radiative effect on a regional scale.
Rights: ©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
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)

Submitter: 宮崎 雄三

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