DOI: 10.1002/2016JD024957
论文题名: Very low isotope ratio of iron in fine aerosols related to its contribution to the surface ocean
作者: Kurisu M. ; Takahashi Y. ; Iizuka T. ; Uematsu M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 18 起始页码: 11119
结束页码: 11136
语种: 英语
英文关键词: anthropogenic aerosol
; iron
; isotope fractionation
Scopus关键词: aerosol
; aerosol composition
; anthropogenic source
; evaporation
; ferrihydrite
; hematite
; iron
; isotopic fractionation
; isotopic ratio
; marine atmosphere
; particle size
; Chugoku
; Hiroshima [Chugoku]
; Hiroshima [Hiroshima (PRF)]
; Honshu
; Japan
; Pacific Ocean
; Pacific Ocean (Northwest)
英文摘要: Seven size-fractionated aerosol samples were collected from Hiroshima, Japan, and were analyzed in terms of chemical composition, soluble fraction of iron (Fe), Fe species, and Fe isotope ratios. The results suggested that Fe in fine particles contained a larger fraction of anthropogenic aerosols than coarse particles did. Iron in the fine particles was more soluble in simulated seawater (up to 25%) than that in the coarse particles and was in the form of Fe (hydr)oxide species, such as ferrihydrite or hematite. The Fe isotope ratios (δ56Fe) of the coarse particles (+0.04‰ to +0.30‰) were close to the crustal mean value (0.0‰). By contrast, the δ56Fe values of fine particles were much lower and ranged from −2.01‰ to −0.56‰. δ56Fe values of the soluble Fe fraction in the fine particles were remarkably low (−3.91 to −1.87‰), suggesting that anthropogenic aerosols yield soluble Fe with low δ56Fe values. Such low values could be explained by kinetic isotope fractionation during evaporation of Fe at high temperatures, coupled with the refractory characteristics of Fe. Marine aerosols from the Northwest Pacific were also analyzed. The δ56Fe values in the fine particles were also lower than those in the coarse particles. These results may be important to quantitatively estimate the contribution of anthropogenic Fe deposited on the surface ocean on the basis of the Fe isotopes. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62823
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Tokyo, Japan; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
Recommended Citation:
Kurisu M.,Takahashi Y.,Iizuka T.,et al. Very low isotope ratio of iron in fine aerosols related to its contribution to the surface ocean[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(18)