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Journal article

Minor effect of physical size sorting on iron solubility of transported mineral dust

Shi Z, Woodhouse M, Carslaw K, Krom M, Mann G, Baker A, Savov I, Fones G, Brooks B, Drake N, Jickells T, Benning L ...see all

Atmospheric Chemistry and Physics, vol. 11, issue 16 (2011) pp. 8459-8469

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Abstract

Observations show that the fractional solubility of Fe (FS-Fe, percentage of dissolved to total Fe) in dust aerosol increases considerably from 0.1 % in regions of high dust mass concentration to 80 % in remote regions where concentrations are low. Here, we combined laboratory geochemical measurements with global aerosol model simulations to test the hypothesis that the increase in FS-Fe is due to physical size sorting during transport. We determined the FS-Fe and fractional solubility of Al (FS-Al) in size-fractionated dust generated from two representative soil samples collected from known Saharan dust source regions using a customized dust re-suspension and collection system. The results show that the FS-Fe is size-dependent and ranges from 0.1–0.3 % in the coarse size fractions (>1 μm) to ~0.2–0.8 % in the fine size fractions (100 μg m−3) to ~0.2 % at low concentrations (

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