This thesis addressed questions about the Fe cycle by measuring detailed profiles and transects of Fe species and also by exploring the use of a new tracer of Fe, Fe isotopic fractionation. Dissolved Fe concentrations (<0.4 micrometer) reflect atmospheric deposition trends in surface waters, water mass source, age, and transport path. Most of the variation in dissolved Fe is due to variations in colloidal Fe (0.02 to 0.4 micrometer). Trace ...
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