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On voyages in the Iceland Basin in 2007 and 2009, we observed low (ca. 0.1nM) total dissolved iron concentrations [dFe] in surface waters (<150m), which increased with depth to ca. 0.2–0.9nM. The surface water [dFe] was low due to low atmospheric Fe inputs combined with biological uptake, with Fe regeneration from microbial degradation of settling biogenic particles supplying dFe at depth. The...
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