How is human activity spinning the atmospheric Ferrous Wheel (iron aerosol cycle)?

Dr. Douglas Stephen Hamilton, North Carolina State University Raleigh, Raleigh, United States, Elisa Bergas Masso, North Carolina State University, Marine, Earth, and Atmospheric Sciences, Raleigh, United States, Jasper F Kok, University of California Los Angeles, Department of Atmospheric and Oceanic Sciences, Los Angeles, CA, United States and Alessandro Tagliabue, University of Liverpool, Department of Earth, Ocean and Ecological Sciences, Liverpool, United Kingdom