“…Reported values of the Southern Ocean fractional Fe solubility (i.e., the ratio of water leachable Fe to total Fe) range from 0.01 to 90% (Edwards and Sedwick, 2001;Mahowald et al, 2005;Bowie et al, 2009;Baker and Croot, 2010;Heimburger et al, 2013a). This large range may reflect differences in mineral dust concentrations, particle size, atmospheric weathering, cloud chemistry and aerosol leaching methods (Zhuang et al, 1990(Zhuang et al, , 1992Spokes and Jickells, 1995;Chen and Siefert, 2003;Meskhidze et al, 2003;Bonnet and Guieu, 2004;Mackie et al, 2005;Buck et al, 2006;Meskhidze and Nenes, 2006;Aguilar-Islas et al, 2010;Trapp et al, 2010). Laboratory studies have indicated that aerosol Fe solubility is enhanced by acid processing (Spokes et al, 1994;Desboeufs et al, 1999), although this relationship was not observed in the remote Atlantic and Pacific ocean (Hand et al, 2004;).…”