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

ZB Shi, MT Woodhouse, KS Carslaw, MD Krom, GW Mann, AR Baker, I Savov, GR Fones, B Brooks, N Drake, TD Jickells, LG Benning

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

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 (
Original languageEnglish
Pages (from-to)8459-8469
Number of pages11
JournalAtmospheric Chemistry and Physics
Volume11
Issue number16
DOIs
Publication statusPublished - 2011

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