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Spatial and temporal variability of trace metals (Fe, Cu, Mn, Zn, Co, Ni, Cd, Pb), iron and copper speciation, and electroactive Fe-binding humic substances in surface waters of the eastern Gulf of Mexico

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doi: 10.1016/j.marchem.2020.103891
Authors:Mellett, Travis; Buck, Kristen N.
Author Affiliations:Primary:
University of South Florida, College of Marine Science, Tampa, FL, United States
Volume Title:Marine Chemistry
Source:Marine Chemistry, Vol.227. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0304-4203
Publication Date:2020
Note:In English. 130 refs.; illus., incl. sketch maps
Summary:The concentrations of bioactive trace metals (Fe, Cu, Mn, Zn, Co, Ni, Cd, and Pb), Fe-and Cu-binding organic ligands, and electroactive Fe-binding humic substances were measured in surface waters across the West Florida Shelf in the eastern Gulf of Mexico in June 2015 and in February-March 2018. Seasonal differences in dust deposition were associated with increased concentrations of Fe, Mn and Pb in offshore surface waters in June 2015 compared to Feb-Mar 2018. Total concentrations of Fe-binding ligands offshore were similar between seasons, and this ambient ligand pool acted to stabilize a portion of Fe delivered via dust deposition within the dissolved fraction. Apparent photoreduction of Cu-binding organic ligands in offshore summer surface waters led to bioavailable Cu2+ concentrations that could potentially inhibit the growth of some cyanobacteria species. The concentrations of Fe-binding humic-like ligands were better correlated with Cu-binding ligands than Fe-binding ligands, suggesting that terrestrially derived photoactive ligands may have a significant influence on the cycling of Cu-binding ligands across the West Florida Shelf. Intrusion of the Loop Current into the study region was observed in June 2015 and appeared to entrain bands of low salinity water from the northern Gulf of Mexico. This process brought elevated trace metals and Fe-binding humic-like ligands to the outer West Florida Shelf, which may then be delivered to the North Atlantic via the Loop Current-Florida Current-Gulf Stream system.
Subjects:Chemical fractionation; Clastic sediments; Copper; Currents; Dust; Geochemistry; Humic substances; Iron; Ligands; Marine environment; Metals; Ocean currents; Organic compounds; Sea surface water; Sea water; Seasonal variations; Sediments; Shelf environment; Trace metals; Atlantic Ocean; Gulf of Mexico; North Atlantic; Eastern Gulf of Mexico; West Florida Shelf
Coordinates:N100000 N350000 W0600000 W0900000
Record ID:892028-3
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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