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DOI	10.5194/acp-21-16027-2021
	Contribution of combustion Fe in marine aerosols over the northwestern Pacific estimated by Fe stable isotope ratios
	Kurisu M.; Sakata K.; Uematsu M.; Ito A.; Takahashi Y.
发表日期	2021
ISSN	1680-7316
起始页码	16027
结束页码	16050
卷号	21 期号:20
英文摘要	The source apportionment of aerosol iron (Fe), including natural and combustion Fe, is an important issue because aerosol Fe can enhance oceanic primary production in the surface ocean. Based on our previous finding that combustion Fe emitted by evaporation processes has Fe isotope ratios (d56Fe) that are approximately 4ĝ€¯‰ lower than those of natural Fe, this study aimed to distinguish aerosol Fe sources over the northwestern Pacific using two size-fractionated marine aerosols. The d56Fe values of fine and coarse particles from the eastern or northern Pacific were found to be similar to each other, ranging from 0.0ĝ€¯‰ to 0.4ĝ€¯‰. Most of them were close to the crustal average, suggesting the dominance of natural Fe. On the other hand, particles from the direction of East Asia demonstrated lower d56Fe values in fine particles (-0.5ĝ€¯‰ to -2.2ĝ€¯‰) than in coarse particles (on average -0.02ĝ€¯±ĝ€¯0.12ĝ€¯‰). The correlations between the d56Fe values and the enrichment factors of lead and vanadium suggested that the low d56Fe values obtained were due to the presence of combustion Fe. The d56Fe values of the soluble component of fine particles in this region were lower than the total, indicating the preferential dissolution of combustion Fe. In addition, we found a negative correlation between the d56Fe value and the fractional Fe solubility in air masses from the direction of East Asia. These results suggest that the presence of combustion Fe is an important factor in controlling the fractional Fe solubility in air masses from the direction of East Asia, whereas other factors are more important in the other areas. By assuming typical d56Fe values for combustion and natural Fe, the contribution of combustion Fe to the total (acid-digested) Fe in aerosols was estimated to reach up to 50ĝ€¯% of fine and 21ĝ€¯% of bulk (coarseĝ€¯+ĝ€¯fine) particles in air masses from the direction of East Asia, whereas its contribution was small in the other areas. The contribution of combustion Fe to the soluble Fe component estimated for one sample was approximately twice as large as the total, indicating the importance of combustion Fe as a soluble Fe source despite lower emissions than the natural. These isotope-based estimates were compared with those estimated using an atmospheric chemical transport model (IMPACT), in which the fractions of combustion Fe in fine particles, especially in air masses from the direction of East Asia, were consistent with each other. In contrast, the model estimated a relatively large contribution from combustion Fe in coarse particles, probably because of the different characteristics of combustion Fe that are included in the model calculation and the isotope-based estimation. This highlights the importance of observational data on d56Fe for size-fractionated aerosols to scale the combustion Fe emission by the model. The average deposition fluxes of soluble Fe to the surface ocean were 1.4 and 2.9ĝ€¯nmolĝ€¯m-2ĝ€¯d-1 from combustion and natural aerosols, respectively, in air masses from the direction of East Asia, which suggests that combustion Fe could be an important Fe source to the surface seawater among other Fe sources. Distinguishing Fe sources using the d56Fe values of marine aerosols and seawater is anticipated to lead to a more quantitative understanding of the Fe cycle in the atmosphere and surface ocean. © 2021 Minako Kurisu et al.
语种	英语
scopus关键词	aerosol composition; aerosol formation; combustion; dissolution; iron; stable isotope; vanadium; Far East
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246469
作者单位	Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan; Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan; Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan; Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan; Center for Environmental Science in Saitama, 914 Kamitanadare, Kazo, Saitama, 347-0115, Japan; Research Institute for Global Change, JAMSTEC, 3173-25, Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
推荐引用方式 GB/T 7714	Kurisu M.,Sakata K.,Uematsu M.,et al. Contribution of combustion Fe in marine aerosols over the northwestern Pacific estimated by Fe stable isotope ratios[J],2021,21(20).
APA	Kurisu M.,Sakata K.,Uematsu M.,Ito A.,&Takahashi Y..(2021).Contribution of combustion Fe in marine aerosols over the northwestern Pacific estimated by Fe stable isotope ratios.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(20).
MLA	Kurisu M.,et al."Contribution of combustion Fe in marine aerosols over the northwestern Pacific estimated by Fe stable isotope ratios".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.20(2021).