Impact of source and atmospheric processing on Fe solubility in aerosols over the Yellow Sea, China.pdf

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Impact of source and atmospheric processing on Fe solubility in aerosols over the Yellow Sea, China.pdf

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Impact of source and atmospheric processing on Fe solubility in aerosols over the Yellow Sea, China

at SciVerse ScienceDirect Atmospheric Environment 75 (2013) 249e256Contents lists availableAtmospheric Environment journal homepage: www.elsevier .com/locate/atmosenvImpact of source and atmospheric processing on Fe solubility in aerosols over the Yellow Sea, China T.R. Zhang a, J.H. Shi a,*, H.W. Gao a, J. Zhang b, X.H. Yao a,* aKey Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao, China b State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, Chinah i g h l i g h t s Fe-contained aerosols can be grouped into two regimes, i.e., NCS and non-NCS. NCS and non-NCS samples likely came from mineral dust and anthropogenic origins. Fe solubility is higher in mineral dust than in anthropogenic aerosols. Increased Fe solubility in NCS was likely associated with cloud-processing. Increased Fe solubility in non-NCS was caused by acidification reactions.a r t i c l e i n f o Article history: Received 8 September 2012 Received in revised form 2 March 2013 Accepted 8 April 2013 Keywords: Iron solubility Marine aerosols Seawater Biomass burning Aerosol acidity* Corresponding authors. E-mail addresses: engroup@ (J.H. Shi), x 1352-2310/$ e see front matter 2013 Elsevier Ltd. /10.1016/j.atmosenv.2013.04.021a b s t r a c t Thirty four atmospheric total suspended particulate (TSP) samples collected over the Yellow Sea between February and August, 2009 were used to study Fe solubility. Samples were classified into two groups based on calculated air mass back trajectories, i.e., one originating from a northern continental source (NCS, in which Fe solubility was 5.6 3.9%) and the remaining one from other regions (non-NCS, in which Fe solubility was 3.1 5.3%). The calculated enrichment factor (Al is used as a reference) indicated that Fe in the NCS samples was probably derived from natural sources dominated by mineral dust. A deep analysis of soluble Fe and Fe solubility sugges