Journal
CONTINENTAL SHELF RESEARCH
Volume 30, Issue 5, Pages 467-480Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2010.01.001
Keywords
Bering Sea shelf; Leachable particulate iron; Trace metals; Nutrients
Categories
Funding
- National Science Foundation [OCE-0526601]
- Division Of Ocean Sciences
- Directorate For Geosciences [0821303] Funding Source: National Science Foundation
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Surface transects and vertical profiles of total and leachable particulate Fe, Mn, Al and P. along with dissolved and soluble Fe were obtained during August 2003 in the southeastern Bering Sea. High concentrations of leachable particulate Fe were observed in the bottom waters over the Bering Sea shelf with an unusually high percentage of the suspended particulate Fe being leachable. Leachable particulate Fe averaged 81% of total particulate Fe, and existed at elevated concentrations that averaged 23 times greater than dissolved Fe in the isolated cool pool waters over the mid shelf where substantial influence of sedimentary denitrification was apparent. The elevated leachable particulate Fe is suggested to be a result of sedimentary Fe reduction in surficial sediments, diffusion of Fe(II) from the sediments to the bottom waters, and subsequent oxidation and precipitation of reduced Fe in the overlying bottom waters. Eddies and meanders of the Bering Slope Current can mix this Fe-rich water into the Green Belt at the outer shelf-break front. Elevated levels of leachable particulate Fe were observed in surface waters near the Pribilof Islands where enhanced vertical mixing exists. Storm events and/or cooling during fall/winter with the resultant destruction of the thermally stratified two-layer system can also mix the subsurface water into surface waters where the elevated leachable particulate Fe is a substantial source of biologically available Fe. (C) 2010 Elsevier Ltd. All rights reserved.
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