Size-segregated sulfate on top of Mt. Fuji transported from Sakurajima volcano eruption

Shimada, Kojiro; Suzuki, Kei; Kato, Shungo; Itahashi, Shuuichi; Hatakeyama, Shiro

doi:10.51094/jxiv.696

##article.authors##

Shimada, Kojiro University of the ryukyus, Department of Chemistry, Biology, and Marine Science https://orcid.org/0000-0002-7424-8792 https://researchmap.jp/7000019703
Suzuki, Kei Tokyo University of Agriculture and Technology　Faculty of Agriculture
Kato, Shungo Tokyo Metropolitan University　Faculty of Urban Environmental Sciences
Itahashi, Shuuichi Kyushu University　Research Institute for Applied Mechanics
Hatakeyama, Shiro Tokyo University of Agriculture and Technology　Faculty of Agriculture

DOI:

https://doi.org/10.51094/jxiv.696

キーワード:

Size-segregated aerosol、 Size distribution of sulfate、 Mt. Fuji、 East Asia、 Sakurajima volcano eruption

抄録

Size-segregated aerosol samples were collected on Mt. Fuji with a cascade impactor during daytime and nighttime. We analyzed for their ionic and element compositions. Samples were collected from 29 July to 2 August (first period) and from 19 to 21 August 2013 (second period). Based on combined chemical components and CMAQ, in the first period, the air masses had been transported from East Asia. In the second period, the Sakurajima volcano eruption had been transported. NH₄⁺, SO₄^2–and elements were the major ions in 2.5 < Dp ≤ 10 during the second period. The slope of a linear regression of non-sea-salt (nss)-SO₄^2– versus NH₄⁺ was nearly unity, particularly during the first period. However, nss-SO₄^2– in coarse aerosol was shifted in great excess in the second period. We have observed a rare phenomenon in which sulfate shifts to 2.5 < Dp ≤ 10. Although the formation process of (NH₄)₂SO₄ in coarse particle is hypothesized two mechanisms, we hypothesize the third mechanism in this study. Currently, radiative forcing is being discussed for the detection of volcanic aerosols using satellites with particle sizes of 1.2 µm. If this can be clarified, it will improve the reproducibility of sulfate radiative forcing.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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