Mathematics – Logic
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3815611f&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 15, CiteID L15611
Mathematics
Logic
Biogeosciences: Biogeochemical Kinetics And Reaction Modeling (0414, 0793, 1615, 4805, 4912), Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Marine Systems (4800), Biogeosciences: Trace Element Cycling (4875), Oceanography: Biological And Chemical: Photochemistry
Scientific paper
Surface ocean iron speciation is simulated using a time-dependent box-model of light-mediated redox cycling over a range of aeolian inputs of soluble iron in the stratified epipelagic ocean. At steady-state, Dissolved iron (DFe) concentration increases with aeolian input of soluble iron up to 0.1 μmol m-2 d-1, and is limited by the solubility of ferric hydroxide at higher fluxes which causes the formation of colloidal iron. We demonstrate that even in the presence of ample excess ligand, rapid conversion of dissolved iron between oxidized and reduced forms in the tropical surface ocean exposes DFe to colloid formation and scavenging. This result provides an explanation for the much smaller range of interregional variability in DFe measurements (0.05-0.4 nM) than soluble Fe fluxes (0.01-1 μmol m-2 d-1) and dust fluxes (0.1-10 g m-2 yr-1) predicted by atmospheric models. We incorporate the critical behavior of the full chemical speciation model into a reduced, computationally efficient model suitable for large scale calculations.
Dunne John P.
Fan Song-Miao
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