Open AccessEffects of acidic processing, transport history, and dust and sea salt loadings on the dissolution of iron from Asian dust
Author(s) -
Hsu ShihChieh,
Liu Shaw Chen,
Arimoto Richard,
Shiah FuhKwo,
Gong GwoChing,
Huang YiTang,
Kao ShuhJi,
Chen JenPing,
Lin FeiJan,
Lin ChunYao,
Huang JrChun,
Tsai Fujung,
Lung ShihChun Candice
Publication year - 2010
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2009jd013442
Subject(s) - sea salt , sulfate , dissolution , environmental chemistry , total organic carbon , aerosol , nitrate , asian dust , salt (chemistry) , deposition (geology) , scavenging , mineral dust , chemistry , mineralogy , geology , sediment , geomorphology , biochemistry , organic chemistry , antioxidant
Aerosol particles collected over the East China Sea (ECS) were analyzed for water‐soluble Fe (Fe S ), total Fe (Fe T ), and other chemical species. Eight samples were classified as high Asian dust (HAD) on the basis of total Al concentrations ≥1500 ng/m 3 . Comparisons with low Asian dust (LAD) samples showed that unlike Fe T or most other substances, the percentage of Fe T soluble in deionized water (%Fe S ) was lower in the HAD samples. The %Fe S in the HAD samples varied with transport pattern and air mass history. As the difference in Fe S concentrations between HAD and LAD is relatively small and HAD occurs several days each year, the supply of Fe S through dry deposition to the surface ocean may be less sporadic than previously thought. Soluble Fe correlated with non‐sea‐salt sulfate, water‐soluble organic carbon, and nitrate, possibly because of an anthropogenic, relatively soluble, form of Fe or enhanced dissolution caused by reactions with anthropogenic acids. Sea salt loadings evidently have a negative effect on %Fe S , presumably due to buffering effects of the salts. Dust concentrations and %Fe S followed an inverse power law relationship with a moderate correlation, suggesting that the %Fe S may be increased by acid processing during transport as dust loadings gradually decrease.