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Size-resolved sulfate and ammonium measurements in marine boundary layer over the North and South Pacific

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Title: Size-resolved sulfate and ammonium measurements in marine boundary layer over the North and South Pacific
Authors: Ooki, Atsushi Browse this author
Uematsu, Mitsuo Browse this author
Noriki, Shinichiro Browse this author
Keywords: Size distribution
Anthropogenic aerosol
Biogenic sulfate
Ammonium sulfate
Elemental carbon
Issue Date: Jan-2007
Publisher: Elsevier Ltd
Journal Title: Atmospheric Environment
Volume: 41
Issue: 1
Start Page: 81
End Page: 91
Publisher DOI: 10.1016/j.atmosenv.2006.08.003
Abstract: Marine background levels of non-sea-salt- (nss-) SO42− (5.0–9.7 neq m−3), NH4+ (2.1–4.4 neq m−3) and elemental carbon (EC) (40–80 ngC m−3) in aerosol samples were measured over the equatorial and South Pacific during a cruise by the R/V Hakuho-maru from November 2001 to March 2002. High concentrations of nss-SO42− (47–94 neq m−3), NH4+ (35–94 neq m−3) and EC (130–460 ngC m−3) were found in the western North Pacific near the coast of the Asian continent under the influence of the Asian winter monsoon. Particle size distributions of ionic components showed that the equivalent concentrations of nss-SO42− were balanced with those of NH4+ in the size range of 0.06<D<0.22 μm, whereas the concentration ratios of NH4+ to nss-SO42− in the size range of D>0.22 μm were decreased with increase in particle size. We estimated the source contributions of those aerosol components in the marine background air over the equatorial and South Pacific. Biomass burning accounted for the large fraction (80–98% in weight) of EC and the minor fraction (2–4% in weight) of nss-SO42−. Marine biogenic source accounted for several tens percents of NH4+ and nss-SO42−. In the accumulation mode, 70% of particle number existed in the size range of 0.1<D<0.2 μm. In the size rage of 0.06<D<0.22 μm, the dominant aerosol component of (NH4)2SO4 would be mainly derived from the marine biogenic sources.
Relation: http://www.sciencedirect.com/science/journal/13522310
Type: article (author version)
URI: http://hdl.handle.net/2115/18851
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大木 淳之

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