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
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. Sea...
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Digital Commons @ University of South Florida
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/1371 https://doi.org/10.1016/j.marchem.2020.103891 |
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ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-2373 2023-07-30T04:05:35+02:00 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 Mellett, Travis Buck, Kristen N. 2020-01-01T08:00:00Z https://digitalcommons.usf.edu/msc_facpub/1371 https://doi.org/10.1016/j.marchem.2020.103891 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/1371 doi:10.1016/j.marchem.2020.103891 https://doi.org/10.1016/j.marchem.2020.103891 Marine Science Faculty Publications Trace metals Iron speciation Copper speciation Organic ligands West Florida Shelf Gulf of Mexico Life Sciences article 2020 ftusouthflorida https://doi.org/10.1016/j.marchem.2020.103891 2023-07-13T21:02:30Z 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. Article in Journal/Newspaper North Atlantic University of South Florida St. Petersburg: Digital USFSP Marine Chemistry 227 103891 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Trace metals Iron speciation Copper speciation Organic ligands West Florida Shelf Gulf of Mexico Life Sciences |
spellingShingle |
Trace metals Iron speciation Copper speciation Organic ligands West Florida Shelf Gulf of Mexico Life Sciences Mellett, Travis Buck, Kristen N. 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 |
topic_facet |
Trace metals Iron speciation Copper speciation Organic ligands West Florida Shelf Gulf of Mexico Life Sciences |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Mellett, Travis Buck, Kristen N. |
author_facet |
Mellett, Travis Buck, Kristen N. |
author_sort |
Mellett, Travis |
title |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2020 |
url |
https://digitalcommons.usf.edu/msc_facpub/1371 https://doi.org/10.1016/j.marchem.2020.103891 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/1371 doi:10.1016/j.marchem.2020.103891 https://doi.org/10.1016/j.marchem.2020.103891 |
op_doi |
https://doi.org/10.1016/j.marchem.2020.103891 |
container_title |
Marine Chemistry |
container_volume |
227 |
container_start_page |
103891 |
_version_ |
1772817582272806912 |