“…The Ross Sea Polynya exhibits nutrient-like depletion of dissolved iron to low concentrations (∼0.1 nM) that has been shown to limit algal growth rates (Martin et al, 1990;Sedwick et al, 2000;Cochlan et al, 2002;Coale et al, 2003;Bertrand et al, 2007). Enhanced iron concentrations have been observed in proximity to melting sea ice and the sea floor, implicating these as important regional sources of dissolved iron (Sedwick and DiTullio, 1997;Fitzwater et al, 2000;Sedwick et al, 2000Sedwick et al, , 2011Coale et al, 2005;. Zinc in the Ross Sea shows a seasonal drawdown, with a significant labile particulate fraction that allows recycling of Zn in the upper water column (Fitzwater et al, 2000;Coale et al, 2005).…”