Influence of Atmospheric Processes on the Solubility and Composition of Iron in Saharan Dust

• Published in: Environmental Science & Technology
• Main Authors: Longo, Amelia F., Feng, Yan, Lai, Barry, Landing, William M., Shelley, Rachel U., Nenes, Athanasios, Mihalopoulos, Nikolaos, Violaki, Kalliopi, Ingall, Ellery D.
• Other Authors: School of Earth and Atmospheric Sciences Atlanta, Georgia Institute of Technology Atlanta, Advanced Photon Source ANL (APS), Argonne National Laboratory Lemont (ANL)-University of Chicago-US Department of Energy, Argonne National Laboratory Lemont (ANL), Department of Earth, Ocean and Atmospheric Science Tallahassee (FSU, Florida State University Tallahassee (FSU), Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Foundation for Research and Technology - Hellas (FORTH), National Observatory of Athens (NOA), University of Crete Heraklion (UOC)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2016
• Subjects: sulfur-dioxide; phytoplankton bloom; southern-ocean; chemical-composition; marine aerosols; mineral dust; north-african dust; nutrient-limitation; particulate matter; thermodynamic-equilibrium model; ACL; geo; envir; Southern Ocean
• Online Access: https://doi.org/10.1021/acs.est.6b02605; https://hal.archives-ouvertes.fr/hal-01483179

00000 ăWOS:000379366300039 International audience Aerosol iron was examined in Saharan dust plumes using a combination of iron near-edge X-ray absorption spectroscopy and wet-chemical techniques. Aerosol samples were collected at three sites located in the Mediterranean, the Atlantic, and Bermuda to characterize iron at different atmospheric transport lengths and time scales. Iron(III) oxides were a component of aerosols at all sampling sites and dominated the aerosol iron in Mediterranean samples. In Atlantic samples, iron(II and III) sulfate, iron(III) phosphate, and iron(II) silicates were also contributors to aerosol composition. With increased atmospheric transport time, iron(II) sulfates are found to become more abundant, aerosol iron oxidation state became more reduced, and aerosol acidity increased. Atmospheric processing including acidic reactions and photoreduction likely influence the form of iron minerals and oxidation state in Saharan dust aerosols and contribute to increases in aerosol-iron solubility.