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DOI	10.1016/j.atmosenv.2019.117193
	Determination of calcium and sulfate species in aerosols associated with the conversion of its species through reaction processes in the atmosphere and its influence on cloud condensation nuclei activation
	Miyamoto C.; Sakata K.; Yamakawa Y.; Takahashi Y.
发表日期	2020
ISSN	1352-2310
卷号	223
英文摘要	Calcium (Ca) species in aerosols collected in Higashi–Hiroshima in southwestern Japan were determined by X-ray absorption near-edge structure (XANES) analysis, and their size distributions and seasonal variation were investigated. Calcium K-edge XANES results showed that gypsum (CaSO4⋅2H2O) and calcium oxalate (CaC2O4⋅2H2O) were the major Ca species that were formed by reactions of mineral particles in the atmosphere. These species exhibit similar hygroscopicity to that of calcite (CaCO3), which is an original Ca species in mineral particles. In addition, high hygroscopic Ca species, such as calcium nitrate [Ca(NO3)2⋅4H2O] and calcium chloride (CaCl2⋅2H2O) were considered minor Ca species. Moreover, the formation of CaSO4⋅2H2O by the reaction of mineral particles suppresses the formation of hygroscopic sulfate aerosol species, such as ammonium sulfate [(NH4)2SO4], reducing the number of cloud condensation nuclei (CCN). Sulfur K-edge XANES also confirmed that CaSO4⋅2H2O was a major species of sulfate in coarse particles. By contrast, high hygroscopic sulfate, such as (NH4)2SO4, was major species in fine particle. In addition, CaSO4⋅2H2O fraction to total sulfate increased during the sampling period, which was affected by a dust event. Consequently, the amount of hygroscopic sulfate in fine particles was decreased by the reaction, forming CaSO4⋅2H2O in coarse particles in the presence of mineral dust. Although these facts have been indicated mostly by modeling and laboratory studies, the present research suggested that the reaction of CaCO3 to form CaSO4⋅2H2O will reduce the amount of hygroscopic sulfate aerosols based on natural sample measurement in terms of the speciation of Ca and sulfate in aerosols using XANES spectroscopy. © 2019 Elsevier Ltd
英文关键词	Calcium; Cloud condensation nuclei (CCN); Mineral particles; Reaction; Sulfate; X-ray absorption near-edge structure (XANES)
语种	英语
scopus关键词	Absorption spectra; Aerosols; Calcite; Calcium; Calcium carbonate; Calcium chloride; Condensation; Dust; Nitrogen compounds; Particle size analysis; Superconducting materials; X ray absorption; X ray absorption near edge structure spectroscopy; Cloud condensation nuclei; Mineral particles; Reaction; Sulfate; X-ray absorption near-edge structure; Sulfur compounds; ammonium sulfate; calcium; calcium carbonate; calcium chloride; calcium oxalate; calcium sulfate; mineral; nitrate; sulfate; sulfur; aerosol; aerosol composition; ammonium sulfate; calcite; calcium; chemical alteration; chloride; cloud condensation nucleus; hygroscopicity; seasonal variation; speciation (chemistry); XANES spectroscopy; atmosphere; autumn; chemical reaction; cloud condensation nuclei; Japan; mineral dust; particle size; particulate matter; priority journal; seasonal variation; spring; summer; wettability; winter; X ray absorption near edge structure spectroscopy; Chugoku; Hiroshima [Chugoku]; Honshu; Japan
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129641
作者单位	Graduate School of Science, The University of Tokyo, 7-1-3, Hongo, Bunkyo-ku113-0033, Japan; Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
推荐引用方式 GB/T 7714	Miyamoto C.,Sakata K.,Yamakawa Y.,et al. Determination of calcium and sulfate species in aerosols associated with the conversion of its species through reaction processes in the atmosphere and its influence on cloud condensation nuclei activation[J],2020,223.
APA	Miyamoto C.,Sakata K.,Yamakawa Y.,&Takahashi Y..(2020).Determination of calcium and sulfate species in aerosols associated with the conversion of its species through reaction processes in the atmosphere and its influence on cloud condensation nuclei activation.Atmospheric Environment,223.
MLA	Miyamoto C.,et al."Determination of calcium and sulfate species in aerosols associated with the conversion of its species through reaction processes in the atmosphere and its influence on cloud condensation nuclei activation".Atmospheric Environment 223(2020).